SLAT (Spousal Lifetime Access Trust)

Definition

A Spousal Lifetime Access Trust (SLAT) is an irrevocable trust established by one spouse (the “grantor spouse”) naming the other spouse (the “beneficiary spouse”) and typically descendants as beneficiaries. Gift tax lifetime exemption is used to fund the SLAT, moving assets out of the taxable estate while the grantor spouse retains indirect economic access through the beneficiary spouse.

SLATs became a dominant wealth-transfer tool in the run-up to possible sunset of the federal estate tax exemption (the TCJA exemption was scheduled to revert in 2026 before further extension) and remain a standard element of high-exemption-use planning.

Why the structure works

The core trade-off in traditional estate freeze planning is that gifting assets reduces the taxable estate but removes direct access to those assets. A SLAT softens that trade-off: by naming the spouse as a discretionary beneficiary, the family unit retains access to distributions — for health, education, maintenance, and support, or in the trustee’s broader discretion — while the grantor spouse has surrendered direct ownership.

Structurally:

• The grantor spouse makes a completed gift of assets to the SLAT
• Gift tax lifetime exemption is used (2026 federal exemption: $15M per individual)
• The trust is irrevocable and the grantor’s access is indirect, via the beneficiary spouse
• Assets and future appreciation sit outside the grantor’s estate
• Distributions to the beneficiary spouse fund family needs without reclaiming the gift

Grantor trust status

SLATs are almost always structured as grantor trusts — meaning the grantor spouse pays the trust’s income tax out of separate funds, further depleting the taxable estate. This combines with the completed gift to produce compounded estate-reduction benefit. The grantor-trust mechanics are the same as in IDGT planning.

Reciprocal SLATs and the reciprocal trust doctrine

A common pattern: each spouse creates a SLAT naming the other. Done carelessly, this triggers the reciprocal trust doctrine — the IRS unwinds the structure and treats each spouse as the beneficiary of their own trust, pulling assets back into the estate.

Avoiding reciprocal trust treatment requires genuine structural differences between the two SLATs:

• Different funding dates (often separated by 12+ months)
• Different asset types
• Different trustee structures and powers
• Different beneficiary classes and distribution standards
• Different trust terms

Well-advised families use reciprocal SLATs effectively; poorly structured reciprocal SLATs are a known failure mode.

Divorce risk

SLATs rely on the beneficiary spouse’s access for the family’s indirect retention of value. Divorce detaches that access. Planning mitigations include:

• Floating spouse provisions (trust automatically benefits the “then-current spouse”)
• Mandatory distributions only after remarriage
• Trust protector powers to remove a former spouse beneficiary
• Division of funded assets between the spouses to reduce single-point-of-failure

None of these fully eliminate divorce risk; families considering SLATs at scale typically think hard about whether the marriage risk is acceptable.

Death of the beneficiary spouse

If the beneficiary spouse predeceases the grantor spouse, the SLAT continues for the remaining beneficiaries (usually children or further descendants). The grantor’s access via spouse is cut off, which may materially change household cash flow expectations. Some SLATs are structured with lifetime income interests to the children or mechanisms that maintain some continuity; others simply accept this outcome.

When SLATs are most valuable

• Households with meaningful unused lifetime exemption who want to deploy it
• Couples with asset bases that comfortably exceed their residual post-SLAT lifestyle needs
• Assets expected to appreciate (shifting appreciation out of the estate)
• Households seeking structural asset protection in addition to transfer tax efficiency

Limitations

• Irrevocable — once funded, the transfer cannot be undone
• Divorce risk (above)
• Beneficiary-spouse-death risk (above)
• Legislative risk — proposed changes to grantor-trust inclusion or to the exemption amount could alter the calculus
• Requires strict discipline — distributions to the beneficiary spouse must be treated as genuine distributions, not de-facto grantor access

Related on QP List

• Topics · Estate Planning
• Topics · Post-Liquidity Planning
• GRAT, IDGT, Dynasty Trust

Nothing on this page is legal or tax advice.