Referral Most irrevocable trusts require the person who creates them to give up access to the assets. That trade-off — protection in exchange for loss of control — is the reason many retirees hesitate. A Spousal Lifetime Access Trust, commonly called a SLAT, threads that needle. One spouse transfers assets irrevocably out of the taxable estate. The other spouse retains the ability to receive distributions from those assets for the rest of their life. The couple gives up ownership of the assets in the legal sense while maintaining practical access to them through the beneficiary spouse.
In a SLAT, one spouse — called the donor spouse — establishes an irrevocable trust and funds it with assets from their own separate property. The other spouse — called the beneficiary spouse — is named as the primary beneficiary of the trust. Children and grandchildren are typically named as remainder beneficiaries. Because the donor spouse has transferred the assets irrevocably and relinquished control, those assets are removed from both spouses' taxable estates. Any future appreciation in the trust assets is also outside the taxable estate. The transfer uses the donor's lifetime federal gift and estate tax exemption — currently approximately $14,000,000 per person in 2025. The beneficiary spouse can receive discretionary distributions from the trust for "health, education, maintenance, and support" — the standard legal language used in trust distribution provisions. This means if the family needs money for medical expenses, living costs, or other needs, the trustee can distribute funds from the trust to the beneficiary spouse. The SLAT's strategic value is the combination of two things happening simultaneously: the assets leave the taxable estate permanently, reducing potential estate tax, and the beneficiary spouse retains access to those assets throughout their lifetime. The couple gives up legal ownership without giving up practical access.
The current federal estate and gift tax exemption — approximately $14,000,000 per person in 2025 — was established by the Tax Cuts and Jobs Act of 2017. Under current law, this exemption is scheduled to revert to roughly $7,000,000 per person (adjusted for inflation) after December 31, 2025. For a married couple with a combined estate of $20,000,000, the difference is significant. Under current law, the first $28,000,000 of their combined estate is exempt from federal estate tax. If the exemption reverts to $7,000,000 per person, only $14,000,000 is exempt — exposing an additional $6,000,000 to the 40% federal estate tax rate, a potential tax increase of $2,400,000. A SLAT funded before the sunset locks in the current higher exemption. Amounts transferred before the reversion are grandfathered under the higher limit, per IRS guidance. This is why many estate planning attorneys refer to 2025 as a narrow and time-sensitive planning window.
Detail Facts Starting estate $25,000,000 in growth stocks SLAT funding $10,000,000 transferred to SLAT for benefit of amount spouse Growth assumption 7% annually over 15 years SLAT value at year $27,500,000 15 Estate tax savings Approximately $11,000,000 in federal estate taxes avoided ($27.5M × 40%) Income tax Donor spouse (Ellen) pays income taxes on trust treatment earnings personally — keeps trust growing without tax drag Source: NAEPC Journal Issue 44 — SLAT Planning; Fidelity Investments — Protect Assets with a SLAT; CAPTRUST **The Reciprocal Trust Doctrine: The Risk That Can Undo the Whole Strategy** The most significant legal risk in SLAT planning is called the Reciprocal Trust Doctrine. This is a rule, established in the United States v. Estate of Grace (1969) Supreme Court case, that the IRS uses to challenge a specific pattern. If both spouses each create a SLAT for the other — Spouse A creates a trust for Spouse B, and Spouse B creates a trust for Spouse A — at the same time, with the same terms and the same funding amounts, the IRS may determine that the two trusts are "reciprocal." When trusts are deemed reciprocal, the court effectively unwinds them, treating each spouse as if they created a trust for their own benefit — which produces no estate tax benefit at all. Planners manage this risk by introducing meaningful differences between the two trusts: different assets, different funding amounts, different distribution provisions, different trustees, or staggered timing. The more distinct the two trusts are from each other, the weaker the argument that they are reciprocal. This is one of the reasons SLATs require experienced legal counsel. A template or an online document service will not navigate the Reciprocal Trust Doctrine. An improperly structured SLAT may appear to work for years — and then fail at exactly the moment it was designed to help.
If the beneficiary spouse dies before the donor spouse, the SLAT's access mechanism ends. The trust continues to exist, and assets remain outside the taxable estate, but the donor spouse can no longer receive indirect distributions through the beneficiary spouse. This is a meaningful planning consideration for couples with a significant age gap, or for situations where one spouse's health is uncertain. Some planners address this by including a "power of appointment" provision that allows the beneficiary spouse, during their lifetime, to redirect trust assets in certain ways. Others build in limited distribution rights to descendants who can share funds with the surviving donor spouse in appropriate circumstances. As with all irrevocable trust planning, the structure should be designed to account for realistic scenarios — not just the optimal one.
A SLAT is appropriate only for specific estate sizes and situations,
NAEPC Journal Issue 44 — SLAT Planning; Fidelity Investments