Spousal Lifetime Access Trust (SLAT): The HNW Estate Planning Guide for California Couples

A Spousal Lifetime Access Trust (SLAT) is an irrevocable trust that lets one spouse transfer assets out of the taxable estate while the other spouse remains a beneficiary. The donor spouse makes a completed gift to the trust, using part of their federal lifetime exemption. The transferred assets, and all future appreciation on them, fall outside both spouses’ combined estates. The beneficiary spouse retains access through distributions during their lifetime.

For 2026, the federal estate and gift tax exclusion is $15,000,000 per individual under IRC §2010(c)(3), as amended by the One Big Beautiful Bill Act. That exclusion is now permanent and inflation-indexed from 2027. For a married couple, the combined shelter is $30,000,000. With no sunset on the horizon, the strategic question shifts from urgency to fit: which assets belong in a SLAT, at what value, and in what structure. For California couples, answering that question requires one additional step no other state imposes: converting community property to separate property under California Family Code §850 before funding the trust, and understanding what that conversion costs in the form of a lost basis step-up under IRC §1014(b)(6).

How a SLAT Works

The donor spouse transfers property to an irrevocable trust. The beneficiary spouse can receive distributions from that trust during their lifetime. The transferred holdings, and all appreciation that accumulates after the transfer, fall outside both spouses’ taxable estates. Life insurance on the donor spouse is a common trust holding; policies on the beneficiary spouse or joint policies should be structured separately to avoid estate tax complications.

The transfer is a completed taxable gift under IRC §2511. The donor spouse gives up dominion and control over the transferred property and cannot reclaim it or redirect it for their own benefit. Because the gift is complete, the marital deduction under IRC §2523 does not apply. The transfer uses the donor’s applicable exclusion amount, reported on a gift tax return on Form 709. At $15,000,000 per individual in 2026, most couples in this estate range have meaningful room to fund a spousal lifetime access trust without exhausting their estate tax exemption.

The beneficiary spouse’s access is governed by the trust document. Most spousal lifetime access trusts use a Health, Education, Maintenance, and Support (HEMS) distribution standard, limiting distributions to amounts needed for those purposes. Some trusts grant the independent trustee broader discretion. That distribution standard has consequences beyond daily access: it also affects how California characterizes the beneficiary’s interest for state income tax purposes, which the California section below addresses directly.

The donor spouse cannot serve as trustee or be named a beneficiary. Either arrangement creates estate tax inclusion risk under IRC §2036, on the basis that the donor retained an interest in or control over the transferred property. The standard structure uses an independent trustee, typically someone other than either spouse.

When the beneficiary spouse dies, the trust continues for the remainder beneficiaries named in the instrument, usually the couple’s children or other family members. Those remaining trust assets pass directly to the next generation without estate tax, at whatever value they have reached at that point. When the donor spouse dies first, the same outcome applies: all trust holdings and accumulated appreciation pass to the named beneficiaries free of estate tax.

The Federal Exclusion in 2026 and Beyond

The federal estate and gift tax exclusion is $15,000,000 per individual in 2026 under IRC §2010(c)(3), as amended by the One Big Beautiful Bill Act. Beginning in 2027, it adjusts annually for inflation. The Tax Cuts and Jobs Act sunset is gone. There is no expiration date to plan around.

A married couple can shelter up to $30,000,000 combined in estate tax exemption, allowing high-net-worth couples to utilize their full lifetime exclusions to move wealth and its future growth outside both estates. A spousal lifetime access trust funded today locks in the exemption amount currently available and shifts all future appreciation outside both estates as well. If one spouse has unused exclusion from a predeceased prior spouse, the portability election under IRC §2010(c)(2) can push that figure even higher. For context, the individual exclusion was $13,610,000 in 2024 before the One Big Beautiful Bill Act took effect.

The annual exclusion under IRC §2503(b) is $19,000 per recipient in 2026. Annual lifetime gifts can supplement a spousal lifetime access trust, but the annual exclusion is not the primary mechanism. A SLAT uses the lifetime exemption.

The elimination of the sunset changes the planning conversation. It used to start with a deadline. Now it starts with a question: does a SLAT fit this particular estate? That depends on liquidity needs, asset mix, whether indirect access through the beneficiary spouse is the right structure, and what California’s community property rules mean for the specific assets under consideration. The exemption will be there. The question is whether to use it this way.

The Grantor Trust Advantage

When a SLAT is structured as a grantor trust, the donor spouse pays income tax on the trust’s earnings from their own assets. The trust keeps the full pretax return. Over time, that arrangement produces an ongoing, invisible second wealth transfer that costs no additional gift tax exemption.

Most SLATs achieve grantor trust status through the swap power under IRC §675(4)(C): the donor retains the right to substitute trust assets with other property of equivalent value. That power, exercised in a nonfiduciary capacity, makes the donor the deemed owner of the trust for income tax purposes. The IRS has confirmed that a properly structured swap power does not cause estate tax inclusion under §2036 or §2038, provided the trustee has a fiduciary obligation to ensure the substituted property is genuinely equivalent in value.

The compounding effect is the planning point. Take a trust generating $200,000 in annual income. In a standard taxable structure, income taxes reduce what stays in the trust. In a grantor trust SLAT, the donor pays those taxes from personal assets outside the trust. The trust compounds on the full return. The donor’s taxable estate shrinks by the taxes paid. Both effects run simultaneously, year after year, without touching the exemption already used to fund the trust.

One trade-off belongs in this conversation: assets held in an irrevocable grantor trust excluded from the donor’s estate carry over their pre-death basis. Grantor trust treatment alone does not cause estate inclusion, and without estate inclusion, IRC §1014 does not apply. The estate tax benefit and the step-up are mutually exclusive for SLAT assets. For highly appreciated assets, that trade-off requires analysis before funding, and for California couples it connects directly to the community property step-up discussion in the next section.

There are situations where a non-grantor structure is the better call. If the donor’s marginal rate significantly exceeds the trust’s effective rate, the income tax benefit runs in reverse. Non-grantor treatment also applies differently when the SLAT holds S-corporation stock: that income is taxed at the trust level under IRC §641(c), not to the donor personally, so the invisible transfer benefit does not extend to the S-corp portion. The business interests section covers this in more detail.

California-Specific Considerations

California married couples face a planning step that no other state requires before a spousal lifetime access trust can be funded: converting community property to separate property. That conversion is not optional, and it carries a cost that should be modeled by an experienced California estate planning lawyer before any property moves into the trust.

Community Property Conversion

California law presumes that property acquired during marriage is community property. A SLAT is funded by one spouse, for the benefit of the other. Before a community property asset can be transferred into a SLAT, it must first become the donor spouse’s separate property under California Family Code §850.

The transmutation must satisfy three requirements: it must be in writing, the writing must expressly state that the property’s characterization is changing, and it must be signed by the spouse whose interest is being reduced. The key word is “expressly.” California courts have held that documents referencing general consideration between spouses, without clearly stating a change in property characterization, do not satisfy this standard. It comes up more often than you would expect with deeds drafted informally or pulled from templates. The document has to be unambiguous on its face.

For real property, a properly drafted interspousal transfer deed satisfies these requirements and is the standard mechanism. For cash, securities, or business interests, a separate written transmutation agreement is required. The deed safe harbor does not extend to personal property. It is a common gap in SLAT funding that can invalidate the transfer if missed.

Both documents must also comply with the fiduciary duty spouses owe each other under Family Code §721. Evidence of undue influence or unfair dealing can undo a transmutation regardless of whether the paperwork was technically correct.

The Community Property Step-Up Trade-Off

The conversion required to fund a SLAT comes with a cost that is easy to underestimate: the loss of the community property basis step-up.

Under IRC §1014(b)(6), both halves of a community property asset receive a fair market value basis adjustment at the first spouse’s death. For a $6 million property with a $600,000 tax basis, the double step-up eliminates $5.4 million in built-in gain. At a combined federal and California capital gains rate of approximately 37%, that step-up preserves roughly $2 million in taxes for the surviving spouse. Once that asset is transmuted and transferred to a SLAT, that benefit is gone.

SLAT assets also do not receive a step-up at the donor’s death. A properly structured spousal lifetime access trust excludes its holdings from the donor’s gross estate, and without estate inclusion, IRC §1014 does not apply. When remainder beneficiaries eventually sell those holdings, they inherit the carryover basis and pay capital gains tax on the full built-in gain.

This does not mean California clients should not fund SLATs with appreciated property. It means the math has to work. For an estate where the primary holding carries a low basis relative to its value, the step-up analysis could change the answer. For an estate with significant liquid wealth and modest unrealized gains, the estate tax savings usually win. The break-even depends on the specific holdings under consideration, and that analysis should happen before funding, not after.

California Income Tax on Trust Income

California taxes trust income based on who is connected to the trust, not where the income is generated. Under California Revenue and Taxation Code §17742, an irrevocable trust owes California income tax on its worldwide income if the beneficiary holds a non-contingent interest and is a California resident. Whether the beneficiary spouse under a SLAT qualifies as non-contingent depends on how the distribution standard is drafted. A HEMS standard arguably creates a non-contingent interest because the entitlement exists, even if the trustee has discretion over the amount.

For most SLATs, this analysis is bypassed entirely. California conforms to the federal grantor trust rules, and when a SLAT is structured as a grantor trust (which most are), the donor spouse pays California income tax directly at their personal rate. The §17742 question only becomes relevant if the grantor trust status is ever terminated.

One thing worth knowing: California’s §17742 as applied to non-contingent beneficiaries is constitutionally unsettled. The U.S. Supreme Court in Kaestner expressly declined to rule on California’s statute. The FTB continues to enforce it, and California courts have upheld the statutory framework, but no court has directly validated it on constitutional grounds post-Kaestner. For non-grantor SLAT structures, that is a real planning consideration.

Most estate planning attorneys can set up a SLAT. Fewer have worked through the California-specific analysis: the transmutation requirement, the step-up trade-off, and the FTB’s approach to trust income. If you’re a California couple evaluating this strategy, those three questions need to be modeled by an experienced California estate planning attorney together before any assets move.

Real Estate and Business Interests in a SLAT

Funding a SLAT with cash or marketable securities is straightforward. Funding it with real estate or a closely held business interest requires more steps, but those assets are often where the greatest estate tax savings sit. Highly appreciated assets with significant future growth potential are exactly what a SLAT is designed to remove from the taxable estate.

Real Estate

Transferring real property into a SLAT requires a new deed, recorded in the county where the property is located, conveying title from the donor spouse to the trust. If there is an existing mortgage on the property, the lender’s consent may be required before the transfer can be made. That step is easy to overlook and can create problems if missed.

California’s Proposition 19 is also relevant for residential real estate. Transfers to an irrevocable trust generally do not qualify for the parent-child exclusion under Prop 19, which means reassessment to current market value may be triggered. For a property held for decades at a low assessed value, that reassessment can be material. The Prop 19 interaction should be analyzed before funding a SLAT with California real property.

Business Interests

Funding a SLAT with a closely held business interest typically requires a formal valuation of the interest being transferred. Minority interests often carry discounts for lack of control and lack of marketability, which reduce the gift tax value of the transfer. More value moves into the trust while using less exemption. The operating agreement or partnership agreement should be reviewed to confirm the interest is transferable and that no co-owner consent is required.

S-corporation stock requires one additional step. A standard irrevocable trust is not an eligible S-corporation shareholder under IRC §1361. Before S-corp stock can be transferred to a SLAT, the trust must qualify as an Electing Small Business Trust (ESBT) under IRC §1361(c)(2)(A)(v) or a Qualified Subchapter S Trust (QSST) under IRC §1361(d). If neither election is in place when the transfer occurs, the corporation’s S-election is terminated.

In practice, the ESBT is the right structure for most SLATs. A QSST requires mandatory income distribution to a single beneficiary, which conflicts with the discretionary HEMS standard most SLATs use. The ESBT accommodates multiple beneficiaries and a fully discretionary trustee, making it compatible with standard SLAT drafting.

One nuance that matters: when an ESBT election is in place, S-corporation income allocated to the trust is taxed at the trust level under IRC §641(c), not to the donor spouse personally. For the S-corp portion of the trust’s holdings, the trust pays income taxes from trust assets rather than the donor paying from personal assets. The grantor trust income-shifting benefit described earlier does not extend to this income stream.

Pre-Exit Timing

For business owners approaching a liquidity event, timing is the most important variable. A SLAT funded before a sale or recapitalization locks in today’s business value for gift tax purposes. Any appreciation between the funding date and the eventual exit falls outside both spouses’ estates without any additional exemption used.

A California business owner with a $10 million interest expected to sell for $25 million in three years has $15 million in appreciation at stake. Funded into a SLAT before the sale, that appreciation passes outside the taxable estate entirely. Left in the owner’s estate through closing, it is subject to estate tax at 40% above the exemption. The deadline is the deal, not a legislative calendar.

Risks and Planning Constraints for SLATs

A spousal lifetime access trust carries real planning risks. Most are manageable when addressed at the drafting stage, before any property moves into the trust.

Loss of Access

If the beneficiary spouse dies or the couple divorces, the donor spouse loses indirect access to trust holdings and may face real financial challenges as a result. If the beneficiary spouse dies first, the trust continues for the remainder beneficiaries and the donor can no longer indirectly benefit from distributions. If the couple divorces, the beneficiary spouse keeps their trust interest. The donor spouse has no claim to the transferred wealth and no way to modify the trust.

Divorce-trigger provisions can address this partially. A well-drafted trust document can include language that limits the ex-spouse beneficiary’s access after a divorce, or accelerates distribution to other beneficiaries. This does not give the donor spouse any right to reclaim transferred property, but it prevents an ex-spouse from continuing to indirectly benefit from a trust the donor funded.

The liquidity point is equally important. Once property is in a spousal lifetime access trust, it is gone. The donor spouse must retain enough liquid wealth outside the trust to cover their own living expenses and tax obligations indefinitely. Underfunding personal liquidity before funding a SLAT is the most common practical mistake.

Because a spousal lifetime access trust is irrevocable, its holdings are generally shielded from the donor spouse’s creditors, lawsuits, and future claims. That asset protection is one reason irrevocability is a feature of this structure, not just a constraint.

Reciprocal Trust Doctrine

The reciprocal trust doctrine is the IRS mechanism for disregarding the separate existence of substantially similar spousal trusts and treating them as one for tax purposes. The doctrine exists to prevent spouses from creating identical mirror trusts to exploit estate tax benefits neither could achieve individually. In United States v. Grace, 395 U.S. 316 (1969), the Supreme Court held that when two trusts are interrelated and leave each settlor in substantially the same economic position as if each had created a trust for themselves, the trusts are uncrossed and the estate tax planning purpose is defeated.

The test is objective: it looks at economic equivalence, not intent. Two SLATs executed on the same day, for the same amounts, with the same distribution standards and the same trustees, present exactly the economic symmetry Grace targets.

Differentiation is the planning response. The trusts should differ in at least two or three of the following: the trustee, the funding amount and asset type, the distribution standard, the timing of execution, or the beneficiary class structure. No single difference is a guaranteed safe harbor, but documented structural differences make the argument that the trusts are not interrelated in the Grace sense.

Step-Up Basis Loss

Trust holdings do not receive a basis step-up at the donor spouse’s death. Without estate inclusion, IRC §1014 does not apply. For highly appreciated property in a SLAT, the built-in gain survives and may increase capital gains tax liability for remainder beneficiaries when they eventually sell.

This was covered in the California step-up section above. The same principle applies to all SLATs regardless of state. The estate tax savings have to be weighed against the capital gains cost for any holding carrying significant unrealized appreciation.

Retained Interest Risk

The non-donor spouse cannot retain any interest in or control over trust holdings that would cause estate tax inclusion under IRC §2036. The structural rules are straightforward: the donor cannot be a trustee, there should be no formal or informal understanding that distributions to the beneficiary spouse cover the donor’s personal obligations, and trust property must be kept strictly separate from both spouses’ personal accounts.

The risk is not theoretical. Courts have pulled transferred wealth back into a decedent’s estate based on implied understandings of retained access, not just formal retained interests. The SLAT structure is sound when drafted and administered correctly by an experienced estate planning attorney. The administration piece matters as much as the drafting.

Summing up: a spousal lifetime access trust is one of the most efficient structures available for removing wealth from a taxable estate while preserving indirect access through the beneficiary spouse. The cost is irrevocability. The planning risks are losing that indirect access if the beneficiary spouse’s death or a divorce occurs, and forfeiting a potential step-up in basis for transferred holdings. For estates at or above the exemption threshold, those trade-offs are worth modeling carefully before any property transfers.

SLAT vs. Other Advanced Strategies

A spousal lifetime access trust is not always the right tool. Understanding how it compares to a GRAT or an IDGT clarifies when each one fits.

SLAT vs. GRAT

A Grantor Retained Annuity Trust shifts future appreciation above a benchmark interest rate out of the taxable estate. The donor transfers property into the GRAT, receives an annuity payment back each year for the trust term, and at the end of the term the remaining holdings pass to the beneficiaries. If the trust’s investments grow faster than the §7520 hurdle rate, the excess moves outside the estate gift-tax-free. If they underperform, the trust essentially returns everything to the donor and the strategy costs nothing.

The GRAT does not use the lifetime exemption. That is its main structural advantage over a spousal lifetime access trust when exemption is limited or needs to be preserved for other estate planning purposes. The trade-off is certainty: a SLAT permanently removes property and all future appreciation the moment it is funded. A GRAT only delivers if the holdings outperform the hurdle rate and the donor survives the trust term.

The beneficiary spouse has no access in a GRAT. For couples who want to preserve indirect access to transferred wealth, the spousal lifetime access trust wins on structure. For couples who have already used significant exemption amount and want to keep transferring wealth without depleting what remains, the GRAT is often the better starting point.

SLAT vs. IDGT

An Intentionally Defective Grantor Trust is typically funded through a gift combined with an installment sale: the donor sells property to the trust in exchange for a promissory note, shifting appreciation above the applicable federal rate. Like a SLAT, the IDGT is a grantor trust for income tax purposes, so the donor pays income tax on trust earnings. Unlike a spousal lifetime access trust, the IDGT does not name the beneficiary spouse as a current income beneficiary.

The IDGT is better suited for moving large, low-basis business interests efficiently: the installment sale mechanism can transfer significant value without a corresponding gift and estate tax event. The SLAT is better when the couple wants ongoing indirect access through the beneficiary spouse and wants to use available exemption now. Both structures can coexist in the same estate plan, and for larger estates they often do.

Dual SLATs

When both spouses fund separate spousal lifetime access trusts for each other, the structural differentiation requirements covered in the Risks section become the primary planning focus. The trusts need to be independently defensible on their own terms, not mirror images of each other. Differences in trustee, funding amount, distribution standard, and execution timing each contribute to that independence.

Contact a CA Estate Planning Attorney

If your estate is approaching or above $15 million, or you are a California business owner with a liquidity event on the horizon, a spousal lifetime access trust may be worth evaluating as part of a broader estate plan. The right place to start is a consultation with an experienced estate planning attorney who understands both the federal exemption mechanics and California’s specific rules around community property and trust income taxation. Reach out to Evolution Tax & Legal to learn more.

Frequently Asked Questions: SLATs

What is the difference between a donor spouse and a beneficiary spouse in a SLAT?

The donor spouse, sometimes called the grantor spouse, transfers property into the trust and gives up ownership permanently. The beneficiary spouse receives distributions from the trust during their lifetime, giving the couple indirect access to the transferred wealth. The donor cannot be a beneficiary of their own SLAT; that arrangement would pull the transferred property back into the donor’s taxable estate under IRC §2036.

What happens if the beneficiary spouse dies or the couple divorces?

If the beneficiary spouse dies first or the couple divorces, the donor spouse loses indirect access to trust holdings and cannot reclaim the transferred property. On the beneficiary spouse’s death, the trust passes to the remainder beneficiaries— typically children or descendants— outside both estates. In a divorce, the beneficiary spouse retains their trust interest unless the trust document contains a divorce-trigger provision limiting or terminating distributions to an ex-spouse.

What are the pros and cons of a spousal lifetime access trust?

The primary advantage of a spousal lifetime access trust is the ability to remove significant wealth and all future appreciation from the taxable estate while preserving indirect access through the beneficiary spouse. Additional benefits include the removal of potential estate taxes on future growth, creditor protection from the donor’s liabilities, and for grantor trust structures, an ongoing income tax benefit that functions as a second wealth transfer at no additional exemption cost. The main drawbacks are irrevocability, the loss of the community property step-up for California couples, no step-up in basis at the donor’s death, and the risk that the beneficiary spouse’s death or a divorce eliminates indirect access entirely.

Does a SLAT protect assets from creditors and lawsuits?

Because a SLAT is irrevocable, its holdings are generally protected from the donor spouse’s creditors, lawsuits, and future legal judgments. The donor has permanently relinquished control over the transferred property, which removes it from the donor’s creditors’ reach in most circumstances. The strength of that protection depends on state law and how the trust is structured, and varies by individual financial situation. An experienced estate planning attorney should evaluate it based on the client’s specific facts.

Do SLAT assets receive a step-up in basis at the donor spouse’s death?

No. SLAT holdings do not receive a step-up in basis at the donor spouse’s death because they are excluded from the donor’s gross estate, and IRC §1014 only applies to property included in the estate. The built-in gain on appreciated property transferred to a SLAT carries over to the trust and eventually to remainder beneficiaries, who will owe capital gains tax when they sell. For assets with significant unrealized appreciation, this trade-off should be modeled before funding, particularly for California couples who would otherwise benefit from the community property double step-up under IRC §1014(b)(6).

Can both spouses each create a SLAT for the other?

Yes, but the two trusts must be structured differently to avoid the reciprocal trust doctrine. Under United States v. Grace, trusts that are substantially identical and leave each spouse in the same economic position as if they had each created a trust for themselves can be uncrossed, defeating the estate tax purpose. Differentiation in at least two or three of the following is the standard planning approach: trustee, funding amount, distribution standard, timing, or beneficiary structure.

Can a SLAT hold S-corp stock?

A SLAT can hold S-corporation stock, but only if a valid ESBT (Electing Small Business Trust) election is in place before the transfer. A standard irrevocable trust is not an eligible S-corporation shareholder under IRC §1361, and transferring S-corp stock into an unqualified trust terminates the corporation’s S-election. The ESBT is the preferred structure for SLATs because the alternative, a Qualified Subchapter S Trust, requires mandatory income distribution to a single beneficiary, which conflicts with the discretionary distribution standard most SLATs use.

What is the HEMS standard and how does it affect distributions?

HEMS stands for Health, Education, Maintenance, and Support, and it defines the purposes for which the beneficiary spouse can request distributions from the trust. It limits trustee authority to distributions serving one of those four purposes, giving the beneficiary spouse meaningful access while reducing the risk that the IRS treats the arrangement as a retained interest by the donor. In California, whether the HEMS standard creates a non-contingent beneficiary interest also affects how the state taxes trust income under California Revenue and Taxation Code §17742.

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.

By: Alton Moore, Esq, CPA