A spousal lifetime access trust, or SLAT, is an irrevocable trust that one spouse funds with their separate assets so those assets leave their taxable estate, while the other spouse stays on as a beneficiary who can receive distributions. The donor uses part of their federal gift and estate tax exemption at the time of the transfer, and everything the assets earn or appreciate to after that point grows outside the estate. For 2026 the exemption is $15 million per individual, so a married couple can shield up to $30 million from federal estate tax between them.1Office of the Law Revision Counsel. 26 U.S. Code 2010 – Unified Credit Against Estate Tax
How the Trust Is Structured
One spouse is the donor. They create the trust, transfer assets in, and file Form 709 to report the transfer as a completed gift against their lifetime exemption.2Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return Once inside, the assets belong to the trust. The trust is irrevocable, so the donor cannot dissolve it or pull the assets back.
The other spouse is the primary beneficiary and can receive distributions, typically limited to health, education, maintenance, and support. The donor has no direct access, but the couple still benefits in practice because the beneficiary spouse can spend distributions on shared household costs. Children or grandchildren are usually named as remainder beneficiaries who take whatever is left when the trust ends.
A trustee manages the trust and controls distributions. Many estate planners recommend an independent trustee rather than either spouse. Independence strengthens the case that the donor truly surrendered control, which the tax rules on retained interests require if the assets are to stay out of the donor’s estate.3eCFR. 26 CFR 20.2036-1 – Transfers With Retained Life Estate
Why It Cuts Estate Tax
Assets inside a SLAT are not part of the donor’s gross estate at death, and neither is any post-transfer appreciation. Fund a SLAT with $5 million in stock, watch it grow to $12 million, and the whole $12 million escapes estate tax at the donor’s death.
The trust can also be kept out of the beneficiary spouse’s estate. The tool for that is the ascertainable standard: limiting the beneficiary’s access to health, education, maintenance, and support. A power confined to those purposes is not a general power of appointment, so it does not pull the trust into the beneficiary’s estate either.4Office of the Law Revision Counsel. 26 U.S. Code 2041 – Powers of Appointment When the beneficiary spouse dies, what remains passes to the remainder beneficiaries without probate and without estate tax in either spouse’s estate.
Grantor Trust Treatment for Income Tax
Most SLATs are drafted as grantor trusts. 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 That is a benefit, not a penalty. The donor’s tax payments further shrink the taxable estate, the trust compounds untouched by income tax, and the IRS does not treat those tax payments as additional gifts.
Grantor status is usually maintained through a power of substitution: the donor keeps the right to swap trust assets for property of equal value, 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 exchange cash for that asset, take the gain on their own return, and leave the trust with a stepped-up basis.
Growth Belongs to the Trust
Assets moved into the SLAT are valued on the day of transfer. Everything they earn or appreciate to afterward belongs to the trust. For a family holding something poised to grow, such as a business, a real estate portfolio, or a concentrated stock position, this growth-shifting can outweigh the initial exemption savings many times over across a couple of decades.
What the 2026 Exemption Means for the Decision
The One Big Beautiful Bill Act, signed on July 4, 2025, set the basic exclusion amount at $15 million per individual for 2026 and made it permanent, with inflation adjustments beginning in 2027.7Internal Revenue Service. About Estate and Gift Tax The sunset that was driving urgency in prior years is gone.
SLATs still matter. The exemption covers your lifetime gifts and your estate combined, so if you expect to exceed it, using exemption now on assets that will grow is still the most efficient way to spend it. Roughly a dozen states levy their own estate or inheritance tax, some with thresholds as low as $1 million, and a SLAT can pull assets below those lines even when federal exposure is small. And the growth-shifting and creditor-protection benefits exist regardless of exemption levels.
Funding a SLAT
You can fund a SLAT with cash, publicly traded securities, real estate, closely held business interests, or life insurance. Only assets individually owned by the donor spouse can go in. Jointly owned or community property assets should not be transferred directly; in community property states, couples typically execute a partition agreement to convert shared property into separate property before the gift.
Mechanics vary by asset. Securities accounts get re-titled in the trust’s name, cash moves to a dedicated trust account, and real estate needs a new deed executed and recorded. For life insurance, the trustee usually buys a new policy on the donor’s life and the donor gifts cash to the trust to cover premiums, which avoids the three-year lookback that can pull a transferred policy back into the estate.
Valuation Discounts on Business Interests
Moving a minority interest in a family business into a SLAT can be especially efficient. Appraisers apply discounts for lack of control and lack of marketability, and for small minority positions those discounts can trim reported gift value by 30% to 40% or more. That lets you move more economic value into the trust while using less exemption. The IRS scrutinizes these valuations, so an independent, qualified appraiser is essential.
Generation-Skipping Transfer Tax
If grandchildren or more remote descendants are remainder beneficiaries, the generation-skipping transfer tax comes into play. The GST exemption for 2026 also sits at $15 million per individual. You allocate GST exemption to the trust on your Form 709 when you report the gift. Allocating the full amount up front matters. Skipping or under-allocating can leave later distributions to grandchildren, or the eventual transfer to them, exposed to a flat 40% GST tax on top of any other tax owed.
The Risks Worth Weighing Before You Sign
A SLAT is irrevocable, and that permanence bites hardest in two scenarios.
Divorce
If the couple divorces, the donor loses all indirect access. The gift was complete and cannot be reversed as part of a property settlement. Depending on how the trust is drafted, the beneficiary spouse may keep receiving distributions after the marriage ends. Some SLATs remove the spouse as beneficiary on divorce, but those provisions have to be in the document from the beginning. If the marriage is unsettled, this is the single largest factor to weigh.
Death of the Beneficiary Spouse
If the beneficiary spouse dies first, the donor permanently loses indirect access. The trust continues for the remainder beneficiaries, but the donor has no right to distributions. Some planners for that reason suggest naming the older or less healthy spouse as the donor, so the beneficiary spouse is more likely to outlive them and keep the access bridge open.
You Cannot Take It Back
Beyond those two events, the general rule is that a SLAT should only be funded with wealth you are confident you will not need back, even under pessimistic assumptions. Access through your spouse is a convenience, not a guarantee.
Two SLATs and the Reciprocal Trust Doctrine
Many couples want each spouse to create a SLAT for the other, effectively doubling the exemption used. The IRS can invoke the reciprocal trust doctrine to collapse two trusts that are mirror images of each other, treating each spouse as having created a trust for their own benefit and unwinding the estate tax advantage.
Meaningful structural differences reduce that risk. Practitioners commonly vary:
- Distribution standards, so one trust uses a narrow health-and-support standard and the other allows discretionary distributions of income and principal.
- Beneficiaries, with one trust covering the spouse plus descendants and the other limited to descendants or restricting the spouse’s role.
- Powers of appointment, granting one spouse a broad lifetime power and the other a narrower testamentary power.
- Trustees, using different individuals or adding a distribution committee to only one trust.
- Timing, funding the trusts in different calendar years rather than the same day or month.
- Asset mix, contributing securities to one trust and business interests to the other.
No court has drawn a bright line, and the IRS has not issued definitive guidance on how different is different enough. This is genuinely uncertain territory. More differences build a stronger position, but no formula guarantees safety. This is work for an attorney with specific experience structuring non-reciprocal SLATs, not a template.
Who a SLAT Fits
SLATs work best for married couples whose combined wealth approaches or exceeds the federal exemption, especially when a large share of that wealth is expected to appreciate. They also fit couples in states with their own estate taxes, even where federal exposure is modest. The indirect access is what distinguishes SLATs from other irrevocable trust strategies: wealth leaves the estate without the household losing all ability to benefit from it.
A SLAT is a poor fit if you cannot afford to part with the assets permanently, if the marriage is uncertain, or if both spouses are in poor health, since the beneficiary spouse’s death closes the access bridge. There are also real costs: legal drafting, appraisals for non-cash assets, and ongoing trustee administration. Professional trustee fees typically run roughly 0.5% to 1% of trust assets a year, with wide variation depending on complexity and institution. For the right family, that cost is a fraction of the tax saved. For the wrong family, a SLAT is an expensive, irrevocable problem.