Spousal Lifetime Access Trust

A Spousal Lifetime Access Trust (SLAT) is an irrevocable gift-tax vehicle that removes assets from the grantor’s taxable estate by gifting them into a trust for the benefit of the grantor’s spouse, utilising the grantor’s unused lifetime gift-tax exemption. Unlike simpler 401k plans or dividend-paying equities, a SLAT preserves indirect access through a discretionary trust structure: the spouse may receive distributions at an independent trustee’s discretion, and if the spouse dies, remainder assets pass to the couple’s children tax-free, creating a multi-generational wealth transfer that would otherwise incur estate taxes at rates up to 40 per cent.

How a SLAT differs from conventional gifting

Most estate planners counsel high-net-worth individuals to make lifetime gifts to children or grandchildren to use the federal lifetime exemption (currently $13+ million per person). A SLAT inversion inverts this logic: instead of gifting directly to descendants, the grantor gifts to an irrevocable trust that benefits the spouse. This permits the grantor to remove assets from his or her taxable estate while preserving a realistic pathway to access capital if needed.

The mechanism works because gift tax law permits spouses to use the lifetime exemption for gifts to third parties. So the grantor makes a $13 million gift into the SLAT, using the exemption, and the trust holds the capital for the spouse’s lifetime. The spouse, as beneficiary, can receive discretionary distributions, which indirectly benefit the grantor if the marriage remains intact and the couple’s finances are commingled.

The independent trustee and the discretionary distribution structure

The defining feature of a functional SLAT is the independent trustee. The grantor cannot serve as trustee—doing so would cause the trust to be included in the grantor’s taxable estate, defeating the purpose. The independent trustee holds all discretion over distributions to the spouse and remainders to children.

In practice, this means the spouse has no legal entitlement to income or principal. The trustee may distribute nothing, or may distribute all net income, or may make discretionary principal advances if the spouse faces financial hardship. The spouse often holds a limited power of appointment, allowing the spouse to redirect remainder amounts among descendant beneficiaries (or, in some cases, back to the grantor’s estate), but this power does not grant the spouse control over distributions to themselves.

This structure relies on the trustee’s prudent judgment and the marriage’s stability. If the couple divorces, the grantor has no legal claim to the trust’s assets, and the spouse may retain full discretionary access. Grantors must be comfortable with this asymmetry.

Why spouses consent and how the economics work

The strategy works only if the spouse consents to serve as primary beneficiary. In intact marriages with transparent financial planning, this is standard; the spouse benefits from the trust’s growth and distributions, and understands that the arrangement benefits both parties by removing assets from the grantor’s estate.

Economically, the SLAT is an arbitrage on exemption timing. If the grantor transfers $13 million today, that amount and all growth escape the grantor’s estate, even if the trust accumulates to $50 million over 20 years. The spouse effectively receives the $50 million gift, but because the spouse did not personally own it (the trust does), the spouse’s estate is enlarged—which may trigger the spouse’s estate tax at death unless the spouse has also exhausted their exemption or dies before accumulation is significant.

Portability and exemption management with spousal cooperation

Under the “portability” rule, if the spouse predeceases the grantor, any unused lifetime exemption of the spouse carries forward to the grantor, doubling the grantor’s available exemption. So if the SLAT spouse dies with a $13 million exemption unused (because the trust never distributed to them), the grantor can claim an additional $13 million exemption on the grantor’s own subsequent gifts or at death.

Conversely, if the spouse uses their own lifetime exemption to make gifts during life, or if the spouse’s taxable estate is large at death, the spouse’s exemption may be partly or fully used, and portability becomes less valuable. Careful estate planning coordinates the SLAT with the spouse’s own gifting strategy and assets to maximise the couple’s combined exemption use.

The estrangement problem and practical limitations

A significant risk of the SLAT structure is marital breakdown. If the grantor and spouse divorce, the grantor cannot reclaim the $13 million gift and has no legal claim to trust distributions. The divorce decree may attempt to allocate a portion of the trust’s value to the grantor as part of the equitable division, but the trust document itself cannot be modified post-funding to revert assets to the grantor (doing so would trigger adverse gift and estate tax consequences).

For this reason, SLATs are typically employed only by couples in stable, long-term marriages and with professional financial advisors who understand the divorce implications. Younger couples or those in second marriages often prefer alternative structures, such as Intentionally Defective Grantor Trusts, that preserve grantor access more clearly.

Liquidity and the two-year rule

A common SLAT refinement involves a survivorship clause or “return to grantor” clause triggered if the spouse dies within a set period (often two years). Some drafters include a provision allowing the spouse to disclaim distributions, which would cause them to flow to children instead. These provisions create flexibility but can complicate the trust’s initial exemption calculation and the characterisation of the gift.

If the grantor needs liquidity and the spouse is willing, the spouse could personally lend capital back to the grantor (not a distribution, but a separate loan), or the trustee could distribute amounts to the spouse, who then gifts them back. These transactions must be carefully documented to avoid IRS challenge.

Interaction with generation-skipping transfer tax

If the SLAT names grandchildren as remainder beneficiaries, the $13 million gift also consumes the grantor’s generation-skipping transfer (GST) tax exemption. Unlike the lifetime exemption, GST exemption is not portable, so careful allocation at funding is required. Most SLATs deliberately allocate exemption to the spouse’s life interest (not generation-skipping) and allocate to the remainder (generation-skipping) only to the extent grantor exemption is available.

See also