TrustFully.law — Estate Planning Insights

The Spousal Lifetime Access Trust (SLAT): How Married Couples Can Lock In the $15 Million Exemption and Still Access Their Wealth

Estate Planning  ·  Spousal Trusts  ·  Gift & Estate Tax Strategy  ·  2026 Planning

With the federal estate tax exemption now permanently fixed at $15 million per person under the 2025 Big Beautiful Bill, many families assume the estate tax is no longer their problem. For some, that’s true. But for married couples with growing businesses, appreciating real estate, or investment portfolios with decades of compounding ahead, the math can change faster than expected — and the time to plan is before the estate grows, not after.

The Spousal Lifetime Access Trust — universally known as a SLAT — is one of the most popular and practical tools for married couples who want to lock in today’s generous exemption, shift future appreciation out of their estate, and still preserve indirect access to the gifted assets through their spouse. It threads a needle that few other estate planning strategies can: removing wealth from the taxable estate while keeping it within the family’s economic reach.

This article explains how SLATs work, why they are particularly compelling right now, and what pitfalls to avoid — including the notorious “reciprocal trust doctrine” that has undone more than a few carefully laid plans.

The Core Problem SLATs Solve

Every dollar you own at death — above the applicable exemption — is subject to federal estate tax at a 40% rate. The exemption is now $15 million per person ($30 million for a married couple with proper planning), which provides substantial shelter. But consider a 50-year-old couple with a $12 million estate today. At a modest 6% annual growth rate, that estate reaches $38 million in 20 years — well into taxable territory, even at the new higher exemption.

The solution is to get assets out of the estate now, while they are still within the exemption, so that future appreciation occurs outside the estate entirely. But most irrevocable transfer strategies involve giving up access to the assets — an uncomfortable trade-off for couples who may need those resources during their lifetimes.

The SLAT solves this tension by making your spouse a beneficiary of the trust. You give up direct access, but your spouse retains the ability to receive distributions — and presumably, what benefits your spouse benefits you as well. It is an indirect but legally effective solution, and when properly structured, it is one of the most powerful tools available to married couples under current law.

What Is a SLAT?

A Spousal Lifetime Access Trust is an irrevocable trust created by one spouse (the “donor spouse”) for the benefit of the other spouse (the “beneficiary spouse”) and, typically, the couple’s children and descendants. The donor spouse makes a gift to the trust — usually using part of their federal gift tax exemption — and the trust is then managed by an independent trustee who can make distributions to the beneficiary spouse during their lifetime.

Because the gift uses the donor’s exemption rather than triggering current gift tax, the transfer is tax-free. Because the trust is irrevocable and the donor spouse has no retained interest, the assets (and all future appreciation) are outside the donor’s taxable estate. And because the beneficiary spouse can receive distributions, the couple retains indirect economic access to the wealth.

The Key Parties

• Donor Spouse — Creates and funds the trust using their gift tax exemption. Cannot be a beneficiary or serve as trustee. Gives up direct control permanently.
• Beneficiary Spouse — Receives distributions from the trust during their lifetime. The trust can also name children and grandchildren as current or remainder beneficiaries.
• Trustee — An independent party (not the donor spouse) who manages the trust assets and makes distribution decisions. The beneficiary spouse may serve as co-trustee in some structures, subject to careful drafting to avoid estate inclusion.
• Remainder Beneficiaries — Typically the couple’s children and grandchildren, who receive the trust assets after the beneficiary spouse’s death.

How a SLAT Works: Step by Step

Step 1: Establish the Trust and Select the Trustee

An estate planning attorney drafts the SLAT, specifying the trustee, the beneficiaries, the distribution standards, and any special provisions. The trust is irrevocable from the moment it is signed. The trustee must be genuinely independent — a family friend, corporate trustee, or another trusted person. The donor spouse cannot serve as trustee.

Step 2: Fund the Trust Using the Gift Tax Exemption

The donor spouse transfers assets — cash, securities, real estate, or business interests — to the SLAT. This transfer is treated as a taxable gift but is sheltered by the donor’s remaining lifetime exemption ($15 million in 2026). A gift tax return (Form 709) is filed to document the use of exemption. No gift tax is owed as long as the cumulative gifts remain within the exemption.

Why act now? Because the exemption applies to the value at the time of the gift. A $3 million business interest gifted today that grows to $9 million over 15 years means $6 million of appreciation escaped the estate entirely — using only $3 million of exemption.

Step 3: Trust Assets Grow Outside the Estate

Once inside the SLAT, all appreciation, income, and reinvested returns occur outside the donor’s taxable estate. If the donor spouse is treated as the “grantor” of the trust for income tax purposes — which is common in SLAT structures — the donor continues to pay income taxes on trust earnings, which is itself a tax-efficient additional transfer to the trust (since those tax payments further reduce the donor’s estate without being treated as additional gifts).

Step 4: Beneficiary Spouse Accesses the Trust as Needed

The trustee can make distributions to the beneficiary spouse under the standards set out in the trust document — commonly for health, education, maintenance, and support (HEMS), or on a more discretionary basis. The beneficiary spouse does not need to justify every distribution, but the trustee must exercise independent judgment. Well-drafted trusts give the trustee broad but guided discretion.

Step 5: At the Beneficiary Spouse’s Death, Assets Pass to Children

When the beneficiary spouse dies, the remaining trust assets — which are not part of either spouse’s taxable estate — pass to the named remainder beneficiaries, typically children and grandchildren. This transfer can be structured to leverage the generation-skipping transfer (GST) tax exemption as well, allowing the trust to benefit multiple generations estate-tax-free.

The Reciprocal Trust Doctrine: The SLAT’s Greatest Danger

Here is where many SLAT plans fail — sometimes catastrophically. The most tempting approach for a married couple is for each spouse to create a SLAT for the other: Spouse A creates a SLAT naming Spouse B as beneficiary; Spouse B simultaneously creates a SLAT naming Spouse A as beneficiary. Each spouse funds their respective trust and both get “indirect access” through the other’s trust.

The IRS knows this trick. The reciprocal trust doctrine — established in United States v. Grace (1969) — provides that if two trusts are “interrelated” and were created in a “reciprocal” arrangement, the IRS will “uncross” them, treating each donor as if they had created the trust for their own benefit. The result: both trusts are pulled back into the respective donors’ taxable estates, eliminating the entire planning benefit.

Avoiding the reciprocal trust doctrine requires thoughtful differentiation: different funding timing (at least a year apart), meaningfully different trust terms, different trustees, different asset classes, different beneficiary provisions, or different term structures. This is not an area for generic templates — it requires experienced drafting and a strategy tailored to the specific facts.

What Happens If the Spouses Divorce?

Divorce is the other major risk factor in SLAT planning. Because the beneficiary spouse’s access to the trust is a key part of the strategy’s appeal, divorce severs that access — permanently. If Spouse A funded a SLAT for Spouse B and the couple later divorces, Spouse A has lost the assets to the trust, the trust no longer provides any indirect benefit to them, and the assets will ultimately pass to the children (or whoever the trust names) without Spouse A having any claim on them.

Well-drafted SLATs address this risk with a “divorce savings clause” — a provision that removes the beneficiary spouse from the trust upon divorce, so the trust does not inadvertently continue benefiting a former spouse. But even with such a clause, the donor spouse has permanently parted with the gifted assets. This is why SLATs are generally most appropriate for couples with stable marriages and a genuine intention to benefit their children and grandchildren, not as a vehicle for retaining personal access to wealth.

SLAT vs. Other Spousal and Gift Strategies

The SLAT is not the only vehicle for married-couple estate planning. Here’s how it compares to related strategies:

SLATs are also frequently used alongside Irrevocable Life Insurance Trusts (ILITs) — where the SLAT provides the income stream that funds life insurance premiums held outside the estate. They complement Personal Residence Trusts (PRTs) as well, which address the family home separately. And for charitably inclined families, a SLAT can work in parallel with a Charitable Remainder Trust to address different asset classes and planning goals simultaneously.

Income Tax Considerations: The Grantor Trust Rules

Most SLATs are structured as “grantor trusts” for income tax purposes. This means the donor spouse — not the trust — is treated as the owner of the trust assets for income tax purposes and pays all income taxes on trust earnings personally. While this might seem like a burden, it is actually a significant planning advantage:

• The donor’s payment of income taxes further reduces their estate without being treated as an additional gift to the trust.
• The trust assets grow without being eroded by income tax inside the trust.
• The trust can engage in transactions with the donor without triggering capital gains recognition — allowing for sophisticated asset swaps and sales.

If the donor spouse dies, the grantor trust status terminates and the trust becomes a separate taxpayer going forward. This transition requires careful planning — particularly around income tax basis and the potential for built-in gains.

The 2026 Opportunity: Why SLATs Matter Now

The 2025 Big Beautiful Bill permanently fixed the federal estate tax exemption at $15 million per person, eliminating the uncertainty created by the prior scheduled sunset. This is welcome clarity — but it does not eliminate the estate tax, and it does not mean planning is unnecessary.

For families whose estates are growing toward the $15 million threshold, now is precisely the time to act. Gifting assets while the estate is below or near the exemption — at today’s values — means future appreciation compounds outside the estate. Waiting until the estate has grown significantly above the threshold means paying estate tax on that appreciation, which a well-timed SLAT could have entirely avoided.

Additionally, the $19,000 per-person annual gift exclusion (2026) can be used alongside the SLAT — for instance, to fund an ILIT or make direct gifts to children — without reducing the lifetime exemption used for the SLAT itself.

Common Mistakes to Avoid

• Simultaneous, mirror-image SLATs. The reciprocal trust doctrine is the SLAT’s biggest legal risk. If both spouses create SLATs at the same time with similar terms and amounts, the IRS may treat the trusts as if each donor retained access to their own trust.
• Donor spouse serving as trustee. If the donor spouse retains control as trustee with discretionary distribution powers over the beneficiary spouse, the IRS may include the trust in the donor’s estate under IRC §2036 or §2038.
• Underfunding or overfunding. The gift must be sized thoughtfully relative to the donor’s total estate and remaining exemption. Overfunding leaves the donor with insufficient personal assets; underfunding doesn’t accomplish meaningful estate reduction.
• Forgetting the divorce risk. Always include a divorce savings clause, and make sure both spouses understand that the donor spouse cannot reclaim the assets in the event of divorce.
• Failing to differentiate dual SLATs. If both spouses fund SLATs, the trusts must be meaningfully different in terms, timing, assets, and beneficiary provisions — or face reciprocal trust challenges.
• Poor trustee selection. The trustee must exercise genuinely independent judgment on distributions. A trustee who simply rubber-stamps every request from the beneficiary spouse risks estate inclusion or self-dealing challenges.
• Using a DIY or generic template. SLAT drafting involves precise navigation of the grantor trust rules, reciprocal trust doctrine, distribution standards, and divorce provisions. A generic form will not address these issues adequately.

Who Should Consider a SLAT?

A SLAT is worth serious consideration for married couples who:

• Have a combined estate between $10 million and $40 million — large enough that growth could push past the exemption, but not so large that more aggressive strategies are needed immediately.
• Own appreciating assets — businesses, real estate, investment portfolios — where locking in today’s lower value is advantageous.
• Want to use the lifetime exemption now and remove future appreciation from the estate, rather than waiting and potentially paying 40% on that growth.
• Are in a stable marriage and are comfortable with the irrevocable nature of the transfer.
• Want to provide for their children and grandchildren while retaining indirect access through the beneficiary spouse.
• Are working with a comprehensive estate plan that coordinates the SLAT with other strategies — an ILIT, a charitable trust, or a family limited partnership.

The Bottom Line

The Spousal Lifetime Access Trust is the rare estate planning vehicle that solves two problems at once: it removes assets and future appreciation from the taxable estate, and it preserves indirect economic access through the beneficiary spouse. For the right couple — growing estate, stable marriage, appreciating assets — it is one of the most efficient and flexible tools available under current law.

The planning requires care. The reciprocal trust doctrine, the divorce risk, and the irrevocability of the transfer mean that SLATs are not set-and-forget vehicles. They require thoughtful drafting, appropriate trustee selection, and coordination with the rest of the estate plan. Done right, however, a SLAT created today on a $5 million asset that grows to $15 million over 20 years represents a $4 million estate tax saving — real, permanent, and compounding — for your family.

At TrustFully.law, we help Missouri families design estate plans that work across generations, combining modern technology with experienced legal counsel. If you are a married couple with a growing estate, a SLAT conversation is one of the most valuable planning conversations you can have right now.

This article is provided for informational purposes only and does not constitute legal or tax advice. The $15 million estate tax exemption and $19,000 annual gift exclusion figures reflect current law as of 2026 following the Big Beautiful Bill. Laws are subject to change. You should consult a qualified estate planning attorney and tax advisor regarding your specific circumstances before implementing any planning strategy.