A spousal lifetime access trust, or SLAT, is an irrevocable trust that one spouse creates and funds for the benefit of the other, moving assets out of the donor spouse’s taxable estate while the beneficiary spouse retains access to distributions. For 2026, the federal estate and gift tax exemption is $15 million per individual, so a married couple can collectively shield up to $30 million from federal estate tax.1Office of the Law Revision Counsel. 26 U.S. Code 2010 – Unified Credit Against Estate Tax A SLAT uses part or all of that exemption now, locking in its benefit and shifting future appreciation outside the taxable estate entirely.
How a SLAT Works
The donor spouse (also called the grantor) creates the trust and transfers assets into it. That transfer is a completed gift, reported on a federal gift tax return (Form 709), and it counts against the donor’s lifetime gift and estate tax exemption.2Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return Once the assets are inside the trust, they belong to the trust. The arrangement is irrevocable: the donor cannot take the assets back or dissolve the trust.
The other spouse is the primary beneficiary and can receive distributions, typically for health, education, maintenance, and support. The donor spouse has no direct access, but benefits indirectly because distributions to the beneficiary spouse can go toward household expenses, travel, or anything else the couple shares. Children, grandchildren, or other family members are usually named as remainder beneficiaries, inheriting what is left when the trust ends.
A trustee manages the assets and controls distributions. Many estate planners recommend an independent trustee rather than either spouse. An independent trustee strengthens the argument that the donor truly gave up control, which is what keeps the assets out of the donor’s taxable estate.3eCFR. 26 CFR 20.2036-1 – Transfers With Retained Life Estate
Why a SLAT Reduces Estate Taxes
Assets inside the SLAT are not part of the donor spouse’s gross estate at death, and neither is their appreciation after the transfer. Fund a SLAT with $5 million in stock that grows to $12 million by the time you die, and the full $12 million escapes estate tax.
A properly drafted SLAT also stays out of the beneficiary spouse’s estate. The key is limiting the beneficiary’s access to an “ascertainable standard” — the health, education, maintenance, and support language found in nearly every SLAT. Under the tax code, a power to access trust property limited to those purposes is not treated as a general power of appointment.4Office of the Law Revision Counsel. 26 U.S. Code 2041 – Powers of Appointment When the beneficiary spouse dies, remaining trust assets pass to the remainder beneficiaries, usually the couple’s children, without probate and without triggering estate tax in either spouse’s estate.
Grantor Trust Income Treatment
Most SLATs are deliberately structured as grantor trusts for income tax purposes, so the donor spouse reports all trust income on their personal return even though the assets belong to the trust.5Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners This sounds like a penalty and is actually a second benefit. The donor pays the income tax, which further shrinks the donor’s taxable estate, and the trust compounds without being reduced by tax payments. The IRS does not treat those tax payments as additional gifts to the trust.
To maintain grantor trust status, many SLATs include a provision giving the donor the power to swap trust assets for property of equal value. This power of substitution is identified in the tax code as an administrative power that causes grantor trust treatment when exercisable in a non-fiduciary capacity.6Office of the Law Revision Counsel. 26 U.S. Code 675 – Administrative Powers The swap power has a practical use too: if the trust holds a highly appreciated asset the donor wants to sell, the donor can swap in cash, letting the trust take a stepped-up basis later while the donor realizes the gain on their own return.
Growth Shifted Out of the Estate
Assets you transfer into a SLAT are valued at the date of transfer. Every dollar of appreciation after that date belongs to the trust and never factors into your estate tax calculation. For families holding assets likely to grow substantially — a business poised to expand, a real estate portfolio, a concentrated stock position — this growth-shifting effect can dwarf the initial exemption savings over a couple of decades.
When a SLAT Makes Sense
The One Big Beautiful Bill Act, signed July 4, 2025, set the basic exclusion amount at $15 million per individual for 2026 and made it permanent, with inflation adjustments starting in 2027.7Internal Revenue Service. About Estate and Gift Tax That removes the earlier sunset pressure, but SLATs remain relevant for several reasons.
The $15 million exemption covers the combined value of your lifetime gifts and your estate at death. If you expect your estate to exceed that figure, or $30 million as a couple, locking in exemption through a SLAT funded with growth assets is still the most efficient way to use it. Roughly a dozen states impose their own estate or inheritance taxes, with exemption thresholds far below the federal level and some starting as low as $1 million. A SLAT that removes assets from your estate can eliminate or reduce state-level estate taxes even if you are nowhere near the federal threshold. And the growth-shifting and creditor-protection benefits exist independently of any exemption level.
What You Can Put In
A SLAT can hold cash, publicly traded securities, real estate, closely held business interests, or life insurance. The critical rule: only assets individually owned by the donor spouse go into the trust. Jointly owned or community property assets should not be transferred directly. In community property states, couples typically need a partition agreement to convert shared assets into separate property before making the gift.
Transferring a minority stake in a family business can be especially tax-efficient. A minority owner lacks control over distributions, hiring, or liquidation, and there is no public market for the interest. Appraisers apply discounts for lack of control and lack of marketability that can reduce the gift’s reported value by 30% to 40% or more for small minority positions. More economic value moves into the trust while less of your lifetime exemption is consumed. The IRS scrutinizes these valuations closely, so an independent, qualified appraiser is essential.
If the SLAT names grandchildren or more remote descendants as remainder beneficiaries, the generation-skipping transfer (GST) tax matters. The GST exemption for 2026 matches the estate tax exemption at $15 million per individual, and you allocate it on Form 709 when you report the gift. Skipping or under-allocating can trigger a flat 40% GST tax on later distributions or the eventual transfer.
The Risks You Need to Weigh
A SLAT is irrevocable, and that permanence shows up in two scenarios that routinely blow up the strategy.
Divorce
If the couple divorces, the donor spouse loses all indirect access to the trust. The assets were a completed gift and cannot be clawed back as part of a property settlement. Depending on how the trust is drafted, the beneficiary spouse may continue receiving distributions after the marriage ends. Some SLATs include provisions that remove the spouse as beneficiary upon divorce, but those clauses must be in the trust from day one. If you have any reservations about the stability of your marriage, this is the single biggest factor to weigh.
Death of the Beneficiary Spouse
If the beneficiary spouse dies before the donor, the donor permanently loses indirect access to the trust assets. The trust continues for the remainder beneficiaries, usually the children, but the donor has no right to distributions. This risk is why some planners suggest the older or less healthy spouse be named as the donor, increasing the odds that the beneficiary spouse outlives them and keeps the access bridge intact.
Irrevocability
Beyond divorce and death, the fact that you cannot undo a SLAT means you should never fund it with assets you might need for your own financial security. Indirect access through your spouse is a convenience, not a guarantee. Only transfer wealth you are confident you will never need back, even under pessimistic market assumptions.
Can Both Spouses Create One? The Reciprocal Trust Problem
Many couples want both spouses to create SLATs, effectively doubling the exemption used. The risk is the reciprocal trust doctrine, which the IRS uses to collapse two trusts that are essentially mirror images. If a court agrees the trusts are reciprocal, each spouse is treated as having created a trust for their own benefit, which destroys the estate tax advantages.
To reduce that risk, the two trusts need meaningful structural differences. Practitioners vary distribution standards (one trust restricted to health and support, the other allowing discretionary distributions of income and principal), beneficiaries (one trust including the spouse plus descendants, the other limited to descendants), powers of appointment (a broad lifetime power in one, a narrower testamentary power in the other), trustees, funding dates in different calendar years, and even the types of assets contributed. No court has drawn a bright line on how different is different enough, and the IRS has not issued definitive guidance. The more variation you build in, the stronger your position, but there is no formula that guarantees safety. Use an attorney with specific experience structuring non-reciprocal SLATs.
Who Should Consider a SLAT
SLATs work best for married couples with combined assets approaching or exceeding the federal exemption, especially when a meaningful share of those assets is expected to appreciate. They also make sense for couples in states with their own estate taxes, even if federal exposure is minimal. The indirect-access feature is what sets a SLAT apart from other irrevocable trust strategies: wealth leaves your estate without completely cutting off your household’s ability to benefit from it.
A SLAT is a poor fit if you cannot afford to permanently part with the transferred assets, if your marriage is uncertain, or if both spouses are in poor health, because the beneficiary spouse’s death eliminates the access bridge. The trust requires upfront legal drafting, appraisals for non-cash assets, and ongoing administration. Professional trustee fees typically range from roughly 0.5% to 1% of trust assets annually, varying with complexity and institution. For the right family, those costs are a fraction of the estate tax savings. For the wrong family, a SLAT creates an expensive, irrevocable problem.