How the Generation-Skipping Transfer Tax Works and What It Costs to Get It Wrong

The generation-skipping transfer tax is a flat 40 percent federal tax on transfers that skip a generation, and every individual can shelter $15,000,000 from it in 2026 through the GST exemption, an amount P.L. 119-21 made permanent.

The rate is the part most families already know. It is rarely the part that costs them money. What costs money is allocation: whether GST exemption was applied to a particular trust, when it was applied, and how much. That question decides whether a trust is fully exempt, partly exempt, or not exempt at all, and the answer attaches to the trust for its entire life.

The practical questions follow from there: whether a trust funded a decade ago is exempt, what years of annual exclusion gifts to grandchildren did to it, and whether a California family can create a dynasty trust at all. Each has a specific answer, and each turns on how the exemption was allocated and to what.

What the Generation-Skipping Transfer Tax Is and Why It Exists

The generation-skipping transfer tax is a 40 percent federal tax imposed under IRC §2601 on transfers that skip a generation, and it exists so that a family cannot avoid one round of estate tax by leaving property directly to grandchildren instead of children.

The federal transfer tax system is built to reach property about once per generation. Property given to a child is taxed on the way there, and faces estate taxes again when that child dies. Leaving the same property directly to a grandchild removes the middle event. Chapter 13 puts it back.

The tax does not replace the gift or estate tax. It sits on top of it. A lifetime gift to a grandchild can attract gift tax under chapter 12 and GST tax under chapter 13 on the same dollars.

The computation is the taxable amount multiplied by the applicable rate, under §2602. The applicable rate is the maximum federal estate tax rate multiplied by the trust’s inclusion ratio, under §2641(a). The 40 percent itself comes from §2001(c), and the maximum rate is defined as that rate determined without regard to the phase-out in §2001(c)(2), under Treas. Reg. §26.2641-1.

Three events trigger the tax. One exemption shelters against it. An allocation regime decides whether the shelter reached a given trust, and that is where most of the real risk sits.

Who the Tax Treats as a Skip Person

A skip person is any individual two or more generations below the transferor, or a trust in which all interests are held by skip persons, under IRC §2613(a).

Everyone else is a non-skip person under §2613(b). That distinction carries more weight than it appears to, because a trust with even one non-skip person holding an interest is not itself a skip person. Most family trusts fall on that side of the line, and that fact drives the GST tax analysis later in this article.

For relatives, generation assignment runs off a common ancestor. Lineal descendants are counted from a common grandparent, on the transferor’s side and separately on the side of a spouse or former spouse, under §2651(b). A child is one generation down, a grandchild two, which makes the grandchild a skip person. A relationship by legal adoption is treated as a relationship by blood, and a half-blood relationship as whole-blood, which answers the question blended families usually raise, under §2651(b)(3).

Spouses take their spouse’s generation regardless of age. Anyone who is or has been married to the transferor sits in the transferor’s own generation, and anyone who is or has been married to a lineal descendant sits in that descendant’s generation, under §2651(c)(1) and (c)(2). A grandchild’s spouse is two generations down and a skip person, even if that spouse is older than the transferor’s own children.

For everyone else, age does the work, and the brackets surprise people. A person not more than 12.5 years younger than the transferor is in the transferor’s generation, a person more than 12.5 but not more than 37.5 years younger is one generation down, and each additional 25 years is another generation, all under §2651(d). A gift to a much younger unmarried partner, or to the child of a friend, can be a generation-skipping transfer without anyone intending it.

One exception moves a beneficiary up. If the beneficiary’s parent who is a lineal descendant of the transferor’s parent has already died, the beneficiary is treated as occupying the generation of that parent’s lowest living lineal ancestor, under §2651(e) and Treas. Reg. §26.2651-1. A grandchild whose parent died before the transfer takes as a child would, and the transfer is not a skip. The test is applied at the moment the transfer becomes subject to chapter 11 or chapter 12 tax on the transferor, and where a transfer is subject to that tax at more than one time, the earliest of those times governs.

The same treatment reaches collateral family members, a grandniece or grandnephew for example, but only where the transferor has no living lineal descendant at the time of the transfer, under §2651(e)(2). A transferor with children cannot reach the exception for a collateral line.

Entities are looked through rather than assigned a generation of their own. An interest held by a partnership, corporation, trust, or estate is treated as held proportionately by the people who hold interests in it, and a charitable organization is assigned to the transferor’s generation, under §2651(f). That last rule is what keeps charitable gifts outside chapter 13.

The Three Transfers That Trigger the Tax

A generation-skipping transfer is one of three things, a taxable distribution, a taxable termination, or a direct skip, and each one is reported on a different return by a different person, under IRC §2611(a).

A direct skip is a transfer to a skip person that is already subject to estate or gift tax, under §2612(c). An outright gift to a grandchild is the plain version. So is a transfer to a trust in which every interest is held by skip persons.

A taxable termination is the end of an interest in trust property, whether by death, lapse of time, release of a power, or otherwise, after which the trust continues for skip persons, under §2612(a). Two exceptions keep it from applying: a non-skip person holds an interest in the trust immediately after the termination, or no distribution may ever be made from the trust to a skip person. This is the event that reaches families years after the planning, when a child’s income interest ends and the trust runs on for grandchildren.

A taxable distribution is any distribution from a trust to a skip person that is neither a taxable termination nor a direct skip, under §2612(b). A discretionary distribution to a grandchild, from a trust that also names the grandchild’s parent as a beneficiary, is the ordinary case.

Two categories sit outside the definition entirely. Tuition paid directly to a school and medical expenses paid directly to a provider are not taxable gifts and are not generation-skipping transfers, and neither is property that already bore the tax on an earlier transfer to someone of the same or a lower generation, under §2611(b)(1) and (b)(2) and §2503(e).

One further rule keeps the tax from reaching the same generation twice. After a generation-skipping transfer where the property stays in trust, the transferor is treated as assigned to the first generation above the highest generation of anyone holding an interest immediately after the transfer, so later distributions to that generation are not taxed again, under §2653(a) and Treas. Reg. §26.2653-1. The reassignment works at the trust level and only going forward. It applies for purposes of chapter 13 other than §2651, so it does not change anyone’s actual generation.

The Five Returns That Report a Generation-Skipping Transfer

The return depends on which of the three transfers occurred, and in two of the three cases the trustee files rather than the family.

Lifetime transfers go on the gift tax return. A donor reports direct skips and indirect skips and allocates GST exemption on Form 709, at Schedule A Parts 2 and 3 and at Schedule D, due April 15 of the following year. Allocation is the part of that filing that matters most, because the return is where an allocation either happens or does not.

Transfers at death go on the estate tax return. The executor reports those transfers and allocates the decedent’s remaining exemption on Schedule R of Form 706, due nine months after death, with a six-month extension available on Form 4768. Where the direct skip comes out of a trust rather than the probate estate, it moves to Schedule R-1, and the division of responsibility there is worth stating precisely because it is so often stated backwards: the executor prepares and sends the voucher, and the trustee pays the tax.

A taxable termination is the trustee’s filing. The trustee files Form 706-GS(T) and carries the tax liability, due April 15 of the year following the termination.

A taxable distribution splits between two filers. The beneficiary who received the distribution reports it on Form 706-GS(D). The trustee separately files Form 706-GS(D-1) and sends a copy to the distributee by April 15, and that notice is required even where the trust’s inclusion ratio is zero and no GST tax is owed.

The practical consequence is that most of these filings do not belong to the person who set the plan up. A trustee who has never been told the trust’s inclusion ratio still has a filing obligation, and a beneficiary can receive a Form 706-GS(D-1) for a distribution they did not know carried a reporting consequence at all.

How the Tax Is Actually Computed: the Inclusion Ratio

The GST tax rate on any transfer is 40 percent multiplied by the trust’s inclusion ratio, so a trust that is 75 percent sheltered by GST exemption pays an effective rate of 10 percent rather than 40.

Two short calculations produce that number. The applicable fraction is the GST exemption allocated to the trust divided by the value of the assets transferred, reduced by any federal estate tax or state death tax actually recovered from the trust and by any charitable deduction allowed, under §2642(a)(2). The inclusion ratio is 1 minus that fraction, under §2642(a)(1). The applicable rate is the maximum federal estate tax rate multiplied by the inclusion ratio, under §2641(a) and (b).

Run it on a trust funded with $20,000,000, against which one spouse allocates the full $15,000,000 exemption. The applicable fraction is $15,000,000 divided by $20,000,000, or 0.75. The inclusion ratio is 1 minus 0.75, or 0.25. The applicable rate is 40 percent multiplied by 0.25, which is 10 percent. Every taxable event from that trust is taxed at 10 percent, for as long as the trust exists. The fraction is rounded to the nearest one-thousandth before it is subtracted, under Treas. Reg. §26.2642-1.

The same $20,000,000 produces a different answer if both spouses’ exemptions are used. Splitting the funding so that each spouse contributes half and allocates against their own contribution leaves the trust fully sheltered: an applicable fraction of 1, an inclusion ratio of zero, and no GST tax on anything the trust ever distributes or terminates into, including decades of growth.

Zero and one are the only two ratios worth having. A trust at zero is exempt and stays exempt. A trust at one is fully taxable, which is at least predictable. A trust at 0.25 is a permanent administrative problem: every distribution for the life of the trust carries a partial tax, every successor trustee has to know the number, and the number travels with the trust through decades of accountings.

Timing changes the denominator, which is why a late allocation costs real money. A timely lifetime allocation fixes the denominator at the gift tax value of the property. A late allocation moves it to the value on the date the allocation is filed, so exemption is spent against whatever the asset has grown into rather than what it was worth when it went in, under Treas. Reg. §26.2642-2.

One structural rule holds all of this together. Portions of a trust attributable to different transferors are treated as separate trusts, as are substantially separate and independent shares held by different beneficiaries, under §2654(b). Outside those two cases a single trust cannot be treated as two, which is why the inclusion ratio attaches to the whole trust and why a mixed ratio takes a severance to fix rather than a bookkeeping entry.

The $15 Million Exemption and the Allocation Rules That Trip People Up

Every individual has a GST exemption equal to the basic exclusion amount, which is $15,000,000 for 2026, and P.L. 119-21 made that figure permanent rather than letting it sunset.

The exemption belongs to the individual, it is allocated by that individual or by the executor after death, and once an allocation is made it cannot be undone, all under §2631. That word, irrevocable, is why the allocation decision deserves more attention than it usually gets. Exemption spent on the wrong trust does not come back.

The exemption is also not a figure set on its own. It is defined as equal to the basic exclusion amount for the year, the same number that governs the estate and gift tax, which is $15,000,000 for 2026, or $30,000,000 for a married couple, confirmed at Rev. Proc. 2025-32 §4.14. Because the two are chained together by definition, the 2025 legislation raised the GST exemption without amending the generation-skipping rules at all: §70106 of P.L. 119-21 changed §2010(c)(3), and the GST exemption followed. The practical version is that there is no separate GST number to track. When the estate exclusion indexes upward after 2026, this figure moves with it.

Permanent here means no sunset is scheduled. The 2026 figure replaces the temporary provision that had been set to expire at the end of 2025, and the amount is indexed for years after 2026 from a 2025 base.

The more useful consequence is not the number itself. It is what the number did to a decision many families already made. Clients who accelerated large gifts in 2024 and 2025, on advice that the exemption was about to be cut roughly in half, now hold a permanent higher exemption and unused headroom above what they used. That raises a live question worth asking with your tax advisor this year: whether to make a late allocation of the remaining exemption to trusts funded under the old assumption, and what that allocation would cost, given that a late allocation is valued when it is filed rather than when the trust was funded.

The permanent exemption changed the planning calculus more than it changed the number. What it did not change is the allocation regime underneath it, and that is where trusts quietly go wrong.

Automatic Allocation Happens Whether You Plan for It or Not

GST exemption is allocated automatically to lifetime direct skips, and to indirect skips made to a trust that meets the statutory definition of a “GST trust,” which means exemption can be consumed on transfers where the client never intended it, under §2632.

A transferor can also allocate affirmatively, at any point up to the due date of that person’s estate tax return, whether or not a return is required. That is a long window, and it is the reason an allocation is often still available when someone finally thinks to check.

The automatic rule for indirect skips is broader than most clients expect. A GST trust is any trust that could produce a generation-skipping transfer with respect to the transferor, unless one of six exceptions applies, under §2632(c)(3)(B). The definition works by presumption, and presumptions misfire in both directions.

The first three exceptions are the ones that come up in practice, and each turns on a quantity rather than on the existence of a right. A trust escapes the definition only if more than 25 percent of the trust corpus must be distributed to or is withdrawable by non-skip persons before age 46, or by those living at the death of someone identified in the instrument who is more than ten years older than they are, or, where those people die first, must pass to their estates or be subject to a general power of appointment they hold. The 25 percent threshold is the test. A withdrawal right that reaches less than that does not take the trust outside the definition.

Two rules at the end of the definition close the obvious workarounds. A right to withdraw an amount no greater than the annual exclusion is disregarded, and powers of appointment held by non-skip persons are assumed not to be exercised. That matters for almost every irrevocable life insurance trust in existence, because it means a Crummey withdrawal power does not push a trust out of GST trust status. The trust stays inside automatic allocation.

That produces the two ways this goes wrong. Exemption gets consumed on a trust the client never meant to shelter, quietly, across years of gifts nobody revisited. Or exemption is assumed to have been allocated when it never was, because no gift tax return was filed and nobody confirmed the trust met the definition to begin with.

Electing Out, and the Difference Between One Transfer and All of Them

A transferor can elect out of automatic allocation, and the election can cover a single transfer or every future transfer to the same trust, which is a distinction that matters years later, under §2632(c)(5).

The same provision runs the other way. A transferor who wants automatic allocation for a trust that does not meet the GST trust definition can elect in, and the trust is then treated as a GST trust for the transfers identified.

Both elections are made on a gift tax return, and that return has to be timely filed for the calendar year of the transfer. This is the deadline clients miss, and missing it is not a paperwork problem. It decides whether the exemption went where they believed it went.

The choice between one transfer and all future transfers deserves a deliberate decision rather than a default. An election out made for a single year’s gift leaves the next year’s gift back inside automatic allocation. An election out made for all future transfers keeps running until it is revoked, through changes in the trust, changes in the family, and changes in whoever is handling the filings.

Where an allocation is made late, the transferor can elect to value the property as of the first day of the month in which the allocation is made rather than the date it is filed, which matters in a month when values have moved. That election is not available where the trust holds a life insurance policy and the insured has already died, under §2642(b)(2) and Treas. Reg. §26.2642-2(a)(2). That is exactly the position an insurance trust is in when someone finally reviews it, because a death is usually what prompts the review.

Married Couples and the Reverse QTIP Election

The estate of the first spouse to die can remain the chapter 13 transferor for a QTIP trust, which is the only way to use that spouse’s GST exemption against property the surviving spouse is treated as owning for estate tax purposes, under §2652(a)(3).

Without the election, the surviving spouse becomes the transferor and the first spouse’s GST exemption is simply not used. For a couple with $30,000,000 of combined exemption, that is an expensive default.

Three mechanics decide whether it works. The election is made on the same return on which the QTIP election is made, not separately and not later. It is irrevocable. And it has to apply to all of the property in the trust that the QTIP election covers, so it cannot be made as to part of a trust, under Treas. Reg. §26.2652-2.

That last rule looks like a trap and is actually a sequencing instruction. The regulation points to the answer itself: an executor can divide a single trust into separate trusts under state law before the Form 706 is due, make the QTIP election for both, and then confine the reverse QTIP election and the GST exemption allocation to one of them, under Treas. Reg. §26.2654-1(b)(1). Sever first, then elect.

Two limits are worth knowing before relying on it. Property that qualifies for the marital deduction as a life estate with a power of appointment is not eligible for a reverse QTIP election, and where a protective QTIP election is made, a protective reverse QTIP election has to be made alongside it or the reverse election does not take effect.

Where the election is made, the value used for the trust’s applicable fraction is the value of the property for QTIP purposes, under §2642(b)(4). A missed election is a recurring and costly problem, and simplified relief for it remains available, under Rev. Proc. 2004-47.

The Annual Exclusion Gift That Is Not GST Free

An annual exclusion gift to a trust for a grandchild is free of gift tax, but it does not give the trust a zero GST inclusion ratio unless the trust satisfies two conditions that a standard multi-beneficiary trust does not meet, under §2503(b) and §2642(c).

The zero-ratio rule for these gifts is narrow. It reaches a direct skip that is a nontaxable gift, and only where two things are true of the trust: during that person’s life, no part of the income or corpus may be distributed to or for the benefit of anyone else, and the trust assets must be includible in that person’s gross estate if the trust does not terminate before they die.

A conventional family trust fails that test twice, for reasons that operate independently of each other. The first is that the rule reaches only direct skips. A trust naming both children and grandchildren as permissible beneficiaries is not a skip person, because non-skip persons hold interests in it, so a contribution is an indirect skip and the zero-ratio rule never engages at all, under §2613(a)(2) and Treas. Reg. §26.2612-1(d)(2). The regulation takes up this exact situation: Crummey withdrawal rights held by grandchildren do not make a trust a skip person where a non-skip person holds a lifetime interest.

The second is that the two conditions describe a trust for one person. A trust that can sprinkle income and principal among several children and grandchildren cannot satisfy a requirement that nothing be distributed to anyone other than a single beneficiary. A Crummey withdrawal power does not change either answer.

None of this affects the gift tax. Those gifts remain free of it, and annual exclusion gifting is still the simplest transfer tool available, at $19,000 per recipient for 2026. What it means is that the trust reaches a zero inclusion ratio through allocation of GST exemption rather than through the exclusion itself. In most cases that allocation happens automatically, because a trust of this kind meets the GST trust definition. The real exposure is narrower and more specific: an election out made years ago and forgotten, a return filed late, or no return filed at all.

That question has a documentary answer. The Forms 709 filed for each year the trust was funded will show whether exemption was allocated, and confirming it is worth doing before the next gift goes in.

Why a GRAT Is a Poor Way to Fund a Generation-Skipping Trust

GST exemption cannot be effectively allocated to property while that property would still be includible in the transferor’s gross estate, which is why a grantor retained annuity trust cannot deliver generation-skipping leverage, under §2642(f).

The period during which that is true is the estate tax inclusion period, and a GRAT, or a Grantor Retained Annuity Trust, creates one by design. The grantor retains an annuity for a term of years, and if the grantor dies during that term the trust property returns to the estate. For the whole term, the property sits inside the transferor’s estate for these purposes.

Two rules make this harder to work around than it first appears. An allocation made before the period closes is irrevocable when made but takes effect no earlier than the close, so allocating early locks in nothing. And where any part of a trust is subject to an inclusion period, the entire trust is treated as subject to it, so the affected portion cannot be walled off from the rest, under Treas. Reg. §26.2632-1(c)(1).

What follows is a valuation problem. Allocation is treated as made when the period closes, and the property is valued at that point. A GRAT is attractive precisely because it moves appreciation to the remainder beneficiaries at a low front-end gift value. By the time exemption can be applied, that appreciation has already happened, so the exemption is spent against the grown value rather than the small one. The leverage that made the GRAT worth doing is the same leverage the allocation rules take back.

Three approaches are common in estate planning where the goal is a trust that holds assets across multiple generations. An installment sale to an intentionally defective grantor trust moves growth outside the estate without creating an inclusion period, so exemption can be allocated at the outset and the growth is captured at a zero inclusion ratio. A spousal lifetime access trust can be drafted as a GST-exempt trust from the beginning. A GRAT remainder can also be poured into a trust that is already exempt, an approach practitioners use, though it is worth saying plainly that no published authority addresses that structure.

This is a common blind spot. A GRAT is a strong tool for moving appreciation to children, and it gets recommended for generation-skipping planning on that reputation alone. The inclusion period is what separates the two uses.

Fixing a Trust With a Mixed Inclusion Ratio

A trust with an inclusion ratio between zero and one can usually be split into a fully exempt trust and a fully taxable trust through a qualified severance, under §2642(a)(3).

The division has to be made on a fractional basis and has to preserve the overall succession of beneficial interests. Where the parent trust’s ratio falls between zero and one, the severance qualifies only if it produces exactly two trusts, one taking a fractional share equal to the applicable fraction and carrying a ratio of zero, the other taking the remaining assets and carrying a ratio of one. That exactly-two requirement applies only in that situation. A trust already sitting at zero or at one can be divided into more than two.

Two further requirements decide whether it works. The severance has to be authorized by the trust instrument or by local law and effective under local law, and funding has to begin immediately and finish within a reasonable time, not exceeding 90 days. The division also has to run on a fractional formula, so a severance that assigns a fixed dollar amount to one trust and the balance to the other does not qualify, under Treas. Reg. §26.2642-6.

A qualified severance takes effect prospectively from its designated date. It does not change the treatment of a distribution or termination that already occurred, though it is treated as occurring immediately before any taxable event the severance itself causes.

A severance that misses these requirements is not recognized as creating separate trusts at all for these purposes. Because the resulting trusts are not separate, they cannot take their own inclusion ratios, and each one carries the ratio of the undivided trust. The split is invisible to the GST tax rules. Nothing in chapter 13 permits treating a single trust as two outside the separate transferor and separate share rules, under §2654(b).

Where the underlying problem is an allocation that was never made on time, relief runs on its own standard. The transferor or executor has to have acted reasonably and in good faith, and relief must not prejudice the interests of the government, measured against factors the regulation sets out, under §2642(g)(1) and Treas. Reg. §26.2642-7(d).

There is a short automatic window and a slow one. The automatic window runs six months from the due date of the return, excluding extensions, and it is available only where the original return was filed on time. A client who never filed a Form 709 does not get it, which is the most common version of this problem. Once that window closes, the route is a private letter ruling.

One note for advisors. This is no longer §9100 relief. That changed on May 6, 2024, under T.D. 9996, 89 FR 37116, and the automatic extension now sits at Treas. Reg. §26.2642-7(i)(1). Simplified relief for certain annual exclusion transfers remains available on its own track, under Rev. Proc. 2004-46.

Dynasty Trusts and Why California Families Look Out of State

California has not abolished the rule against perpetuities, so a trust governed by California law cannot last forever, and a California family that wants a longer-lasting trust has to select another state’s governing law when the trust is drafted.

California follows the Uniform Statutory Rule Against Perpetuities. A nonvested property interest is invalid unless it is certain to vest or terminate no later than 21 years after the death of an individual who was alive when the interest was created, or it in fact vests or terminates within 90 years after creation, under Cal. Prob. Code §21200 and §21205.

That 90-year period is a wait-and-see backstop rather than a design target. It rescues an interest that turns out to resolve inside the window. It does not authorize drafting a trust to run for 90 years.

No California statute permits a perpetual or multi-century family trust. The exclusions from the perpetuities rules are narrow and specific, covering fiduciary powers of administration, certain charitable and governmental transfers, employee benefit plans, hospital service contracts, and group insurance trusts, under Cal. Prob. Code §21225. None of them reaches a family dynasty trust.

One point about dynasty trusts is often stated too broadly. They are not exempt from state perpetuities law as a category. How long a trust can last is a function of the law that governs it, and that governing law is chosen when the trust is drafted rather than assumed afterward.

That makes situs an estate planning decision made at formation rather than an administrative detail, and it raises two separate questions: which state’s law to choose, and whether the choice holds.

What the Common Situs States Actually Allow

The four states most often used by wealthy families for dynasty trusts permit very different durations, and only two of them are effectively perpetual.

South Dakota has not adopted the common law rule against perpetuities, so a South Dakota trust can run indefinitely, under SDCL §43-5-8. Delaware reaches nearly the same result for personal property held in trust, with one exception: real property held directly in trust has to be distributed 110 years from the later of the date it was added to the trust or the date the trust became irrevocable, under 25 Del. C. §503.

That real property limit has a drafting answer written into the statute itself. Intangible personal property, including an interest in a corporation, partnership, or limited liability company, is excluded from the 110-year rule even where the entity owns real property. Delaware real estate held through an LLC is not caught by it.

Nevada and Alaska are long rather than perpetual. Nevada allows 365 years, and the same measure governs spendthrift trusts, which matters because most dynasty trusts are drafted as spendthrift trusts, under Nev. Rev. Stat. §111.1031 and §166.140. Alaska works through a 1,000-year measure applied to powers of appointment rather than as a flat 1,000-year trust term, under Alaska Stat. §34.27.051.

These trust codes are amended frequently. Situs selection is a decision to make against current law rather than against a summary like this one.

Whether a California Family Can Actually Choose Another State’s Law

A California settlor may select another state’s law to govern a trust, but that selection does not control if applying it would be contrary to California public policy, and the rule against perpetuities is a public policy rule, under Cal. Prob. Code §21103.

The statute is explicit about its own limits. It provides that the meaning and legal effect of a disposition is determined by the local law of the state the transferor selects, unless applying that law would be contrary to the rights of a surviving spouse to community and quasi-community property, contrary to any other public policy of this state applicable to the disposition, or, in the case of a will, contrary to the California statutes governing wills.

The middle exception is the one that matters here. California authority treats the rule against perpetuities as resting on public policy rather than on private convenience, which leaves open the possibility that a California court would decline to give effect to a choice of law producing a genuinely perpetual trust. That is a conflict-of-laws question rather than a tax question, and it is unsettled enough that no one should promise an outcome.

What families do in practice is straightforward. They select the law of a state with a longer or unlimited perpetuities period, draft the trust to that state’s limits, and place administration there. What is worth working through with an estate planning attorney before the trust is signed is how durable that selection would be if it were ever tested, and what the trust does for the family members who depend on it if the selection does not hold.

The California Income Tax Follows the Trust Anyway

California taxes the entire income of a trust if any fiduciary is a California resident, and taxes trust income by reference to noncontingent beneficiaries who are California residents, regardless of where the trust is sitused or where the settlor lived, under Cal. Rev. & Tax. Code §17742.

The settlor’s residence is not part of that test, which surprises people who assume a California settlor produces a California trust. A corporate fiduciary is treated as resident where it transacts the major portion of the trust’s administration.

All of this assumes a non-grantor trust. While the grantor is still taxed on trust income, these rules do not bite.

The analysis also runs in a specific order, and reversing it is the most common error in this area. California taxes the entire amount of a trust’s California-source income regardless of who the fiduciaries or beneficiaries are. Only income that is not California-source is then apportioned, by the number of resident fiduciaries and by the number and interest of resident beneficiaries, under Steuer v. Franchise Tax Board, 51 Cal.App.5th 417 (2020), and Cal. Rev. & Tax. Code §§17743 and 17744. Source first, then residence.

A ruling issued in July 2026 sharpened what noncontingent means. A California resident beneficiary whose interest is subject to the trustee’s sole and absolute discretion holds a contingent interest, so California cannot tax an out-of-state trust’s accumulated income on that beneficiary’s residence alone. Once the trustee exercises that discretion and decides to distribute, the beneficiary holds a vested interest in the amount selected, and California may tax the trust on it, under FTB Legal Ruling 2026-01.

Income that escapes tax at the trust level because an interest was contingent does not disappear. It becomes taxable to the beneficiary when it is distributed, and a nonresident beneficiary is taxed only on California-source income, under §17745.

Perpetuities situs and income tax situs are therefore two separate analyses. Choosing South Dakota law for duration does nothing about §17742 if the trustee is Californian or if a beneficiary’s interest is noncontingent. The 2026 ruling sharpens that point rather than softening it, because it tells a California family exactly what has to be true of the trustee’s discretion for the structure to hold.

There is genuinely good news in all of this. California imposes no estate tax on decedents dying on or after January 1, 2005, and no gift tax following the repeal that took effect in June 1982. For a California family, the transfer tax analysis is purely federal, which is why almost everything above this section is federal law.

Funding a Generation-Skipping Trust With Business Interests

A dynasty trust is not automatically an eligible S corporation shareholder, and funding one with S corporation stock takes an electing small business trust election before the S election is at risk, under §1361(e).

Only certain trusts can hold S corporation stock at all. A trust treated entirely as owned by a U.S. citizen or resident qualifies, as does that same trust for two years after the deemed owner dies, a testamentary trust for two years, a voting trust, and an electing small business trust. No foreign trust qualifies under any of them, under §1361(c)(2)(A).

The exposure in that list is easy to miss. A dynasty trust that qualifies today because it is a grantor trust stops qualifying on that basis the moment grantor trust status ends, and the two-year windows that follow a death are short. During that window the deemed owner’s estate is treated as the shareholder, which is what determines who counts toward the shareholder limit.

For a multi-beneficiary dynasty trust, the ESBT is the fit and a qualified subchapter S trust is not. A QSST requires a single current income beneficiary who receives all of the trust’s income, which a trust that sprinkles among several children and grandchildren cannot satisfy, under §1361(d)(3).

There is a drafting answer if a QSST is what the family wants. A substantially separate and independent share is treated as a separate trust, so a trust drafted with separate shares can hold S corporation stock inside a share that meets the QSST requirements, under §663(c).

The ESBT carries a real cost. Its S portion is taxed at the highest individual rate, and the items in that portion are excluded from distributable net income rather than carried out to the beneficiaries, under §641(c). The election is made by the trustee separately for each corporation, filed with the service center where the S corporation files, and it can reach back as far as two months and fifteen days, under Treas. Reg. §1.1361-1(m)(2)(i).

The failure mode is worth naming because it happens quietly. If a trust qualified only as a grantor trust and that status ends without a timely ESBT or QSST election, the trust becomes an ineligible shareholder and the S election terminates automatically, under §1362(d)(2). Relief runs two ways, through inadvertent termination relief that requires a ruling request, or through simplified self-executing relief that does not, under §1362(f) and Rev. Proc. 2022-19.

Two planning points sit alongside eligibility. A qualified appraisal supporting discounts for lack of control and lack of marketability means the same economic interest consumes less GST exemption, which is the entire argument for funding a trust with closely held equity rather than cash. And coordinating the funding with an installment sale to an intentionally defective grantor trust captures the growth outside the estate at a zero inclusion ratio.

This is the point where estate planning and entity structure stop being separate projects. An S election can be lost by a drafting decision made inside a trust years earlier, and the right moment to fund is usually before a sale rather than after, when the value is lower and a discount is defensible. That makes succession timing a tax decision as much as a business one.

What a GST-Exempt Trust Costs You in Basis

Assets that succeed in staying outside the taxable estate never receive another basis adjustment, so a dynasty trust trades a 40 percent transfer tax saving for capital gain on a basis that does not reset for generations, under §1014.

The rule turns on a narrow requirement. A basis adjustment at death reaches property that was required to be included in determining the value of the decedent’s gross estate, under §1014(b)(9). Where a grantor has given assets away completely, relinquishing control and retaining no beneficial interest, nothing pulls those trust assets back into the gross estate, the requirement is not met, and the basis does not adjust. The IRS confirmed exactly this for assets held in a completed-gift irrevocable grantor trust in Rev. Rul. 2023-2.

What the trust and its beneficiaries live with instead is carryover basis. Trust assets transferred in trust take the donor’s adjusted basis, subject to a dual rule that uses the lower of that basis or fair market value at the time of the gift when computing a loss, and increased by gift tax attributable to net appreciation, under §1015. A grandchild receiving a distribution decades from now takes the grantor’s historical basis. The reverse also holds: where gifted property is held under conditions requiring inclusion in the gross estate and is not sold before death, §1014 governs instead, under Treas. Reg. §1.1015-1(d).

The tradeoff is arithmetic, and for a California family the numbers are not obvious in either direction. On one side is 40 percent of the assets transferred, saved permanently, which is the whole reason families use these structures to reduce estate taxes. On the other is combined federal and California capital gain on unrealized appreciation, paid whenever the asset is sold, and paid again by each generation that would otherwise have received a step-up.

For some families the right answer is to keep the asset in the estate. A couple comfortably under the combined exemption, holding California real estate bought in the 1990s with a basis under a fifth of its current value, is very likely better served letting that property take a step-up at death than moving it out of an estate to avoid a transfer tax they were never going to pay.

Above the exemption the analysis reverses. There the transfer tax is a certainty rather than a possibility, the 40 percent is real money, and moving appreciation out early to future generations is worth the basis it costs.

California real property carries a second question alongside this one, since the reassessment rules narrowed considerably for property transferred to children.

Where to Start With a Generation-Skipping Trust

A generation-skipping trust is only as good as the GST tax allocation behind it. A trust can be drafted carefully, funded on schedule, and still carry an inclusion ratio nobody intended, because the exemption question gets answered on a tax return rather than in the trust instrument.

If you have a trust for grandchildren and do not know its inclusion ratio, establishing that is the starting point. If you are about to create one, the allocation decisions deserve to be made deliberately, since they cannot be undone once made. A consultation with an estate planning attorney is the right place to work through either, and the answer depends on your own tax situation rather than on the technique. These decisions also sit inside a broader wealth transfer framework for families above the exemption.

Frequently Asked Questions

Who typically needs a generation-skipping trust?

Families with significant assets above the federal exemption who want to transfer wealth to grandchildren and great-grandchildren rather than only to the next generation. That usually means closely held business interests or real estate expected to appreciate, and a willingness to give up access to whatever goes into an irrevocable trust. Below the exemption the structure often costs more in basis than it saves in transfer tax, which is why this is a question for an estate planning attorney and your financial advisor rather than one answered from a net worth figure alone.

What is the generation-skipping transfer tax rate for 2026?

Forty percent. The generation-skipping transfer tax, often abbreviated GSTT, applies at the maximum federal estate tax rate under §2001(c). It is flat rather than graduated, and it applies on top of any gift or estate tax on the same transfer.

How much is the GST exemption in 2026, and did it change?

The lifetime exemption is $15,000,000 per person for 2026, or $30,000,000 for a married couple. It changed because P.L. 119-21 amended the basic exclusion amount, and the GST exemption is defined as equal to that amount. No sunset is scheduled, and the figure indexes for years after 2026.

Why does the generation-skipping transfer tax exist?

To close a gap in the estate tax. Before the current rules, a family could pass assets directly to grandchildren and skip an entire round of estate tax at the child’s generation. Chapter 13 restores that missing round, which is why the GSTT applies in addition to the gift and estate tax rather than instead of it.

Can a generation-skipping trust avoid double estate taxation?

Reducing estate taxes across generations is the point of the structure. Property left outright to a child is taxed at the parent’s death and again at the child’s death. A trust with a zero inclusion ratio lets the same assets pass to younger generations without a second estate tax at the child’s level. The tax burden that remains is whatever transfer tax is paid on the way in, plus the capital gain the family accepts by giving up a step-up.

Does a generation-skipping trust protect assets from creditors?

Generally yes as to a beneficiary’s creditors, though it depends on the drafting and on the governing law rather than on the GST tax rules. Trust assets held in an irrevocable trust that the settlor neither controls nor can reach are usually beyond a beneficiary’s creditors, particularly where the trust carries a spendthrift provision. A trust the settlor can benefit from is treated very differently. Wealth preservation across generations depends on the asset protection design holding up alongside the tax design.

Do I owe GST tax on a $19,000 annual exclusion gift to my grandchild?

The gift is free of gift tax, but it does not automatically make the trust exempt from GST tax. A $19,000 gift qualifies for the annual exclusion under §2503(b). It produces a zero inclusion ratio only where the transfer is a direct skip and the trust meets both conditions in §2642(c)(2), which a trust naming children and grandchildren together does not. The trust reaches a zero ratio through exemption allocation instead, often automatically.

Can 529 plan contributions reduce GST exposure?

Yes, and the front-loading election is why. A contribution to a 529 plan for a grandchild is a completed gift to the grandchild and a direct skip, and it qualifies for the annual exclusion. A donor may elect to treat up to five years of exclusions as made ratably over five years, which for 2026 means up to $95,000 from one donor, or $190,000 from a married couple electing to split the gift. The gift tax and GST annual exclusions apply ratably across those years, so neither lifetime exemption is consumed. Contributions above that ceiling are not spread, and the excess is a taxable direct skip in the year it is made.

Do charitable lead trusts reduce GST tax exposure?

It depends entirely on which kind, and the two work in opposite directions. For a charitable lead annuity trust, the applicable fraction is not determined until the charitable term ends, and the exemption allocated at funding is credited only with growth at the rate used to value the charitable deduction, so appreciation above that rate goes unsheltered and leaves a positive inclusion ratio. Underperformance is no better, because exemption allocated in excess of the ending value is simply lost. A charitable lead unitrust runs the other way: the charitable deduction reduces the denominator at funding, the inclusion ratio locks in immediately, and later appreciation passes to the remainder beneficiaries sheltered. The special rule at Treas. Reg. §26.2642-3 reaches annuity trusts only.

What is an inclusion ratio, and why does mine need to be zero?

The inclusion ratio is the portion of a trust that GST exemption does not shelter, and it sets the tax rate on everything the trust ever distributes. It equals 1 minus the applicable fraction, and the rate is 40 percent multiplied by it. A ratio of zero means no GST tax, ever. Anything above zero means a partial tax on every distribution for the life of the trust.

Can I set up a dynasty trust in California?

Not one that lasts indefinitely under California law. California retains a statutory rule against perpetuities at Cal. Prob. Code §21205, so a trust governed by California law has to end. Families who want a longer-lasting trust select the law of another state, which §21103 permits subject to California public policy. Whether that selection would survive a challenge on perpetuities grounds is unsettled, and worth working through before the trust is signed.

Does a generation-skipping trust give up the step-up in basis?

Yes, and that is the real cost of the structure. Assets that stay outside the taxable estate are not required to be included in determining the gross estate, so §1014(b)(9) does not reach them and the basis does not adjust at death. Beneficiaries take carryover basis instead, across multiple generations.

What are the disadvantages of a generation-skipping trust?

The basis cost is the largest, and the one families most often underestimate. A trust built to hold assets outside the estate for generations gives up the step-up for those same future generations. The administration is also permanent: someone has to track the inclusion ratio, file trustee returns, and run a structure the settlor will not be present to explain. Whether the tradeoff works turns on a family’s own tax situation rather than on the technique, which is worth modeling with your CPA or financial advisor before committing to it.

This article is for informational purposes only and does not constitute legal or tax advice. Tax laws and regulations change frequently and may affect the accuracy of this information. Consult a qualified tax attorney or CPA before making any decisions based on the content of this article.