Spousal Lifetime Access Trust (SLAT)

A spousal lifetime access trust (SLAT) is an irrevocable trust that lets one spouse remove assets from his or her taxable estate while allowing the other spouse to benefit from those assets during both spouses’ lifetimes. The magic is in the discounting: assets transferred to the SLAT use the grantor’s lifetime gift-tax exemption and are valued at a discount for gift-tax purposes, but the non-grantor spouse retains real access. The catch is the reciprocal-trust doctrine, an IRS rule that can collapse the entire structure if not handled carefully.

The Basic SLAT Structure

Here’s the foundation. Spouse A (the grantor) has significant wealth and wants to pass assets to the next generation without depleting his estate-tax exemption. Instead of making an outright gift to a child, Spouse A creates an irrevocable trust and transfers, say, $5 million of appreciated stock into it.

The trust document grants Spouse B (Spouse A’s spouse) the right to withdraw income and, if desired, some principal during Spouse B’s lifetime. After Spouse B dies, the remaining assets go to the children or other beneficiaries.

From a gift-tax standpoint, the transfer value is discounted. Because Spouse B’s access rights are not as broad as full ownership (the assets are tied up in a trust structure), the IRS allows a valuation discount—typically 20–40%, depending on the trust terms and the underlying assets. So a $5 million transfer might be valued at $3 million for gift-tax purposes, using only $3 million of Spouse A’s lifetime exemption instead of $5 million.

Critically, if the trust is drafted correctly (as a non-grantor trust), the assets and all future growth are excluded from both spouses’ taxable estates. When Spouse B dies, the trust assets don’t jump into Spouse B’s estate; they pass directly to the named beneficiaries (usually the children) free of federal estate tax.

Why Couples Love SLATs: The Doubling Strategy

The real appeal emerges when there are two spouses with substantial wealth. Spouse A creates SLAT 1, transferring assets and using Spouse B as the access beneficiary. Then Spouse B creates SLAT 2, transferring assets and using Spouse A as the access beneficiary.

If executed correctly:

• Each spouse has used his or her own exemption ($13.61 million per person in 2024, indexed for inflation).
• Each spouse has removed assets from his or her own estate.
• Each spouse retains practical access to the transferred assets via the other’s SLAT.
• The couple has sheltered $27.22 million (or more, with growth) from federal estate tax using both exemptions.

Without SLATs, that same couple might simply hold assets jointly or in separate accounts, and the surviving spouse’s estate would be taxed on all assets. The SLAT strategy effectively lets both exemptions work.

The Reciprocal-Trust Doctrine: The IRS Ambush

Here lurks the doctrine that has derailed countless SLATs. The reciprocal-trust doctrine is an IRS and judicial principle that, if two trusts are reciprocal (mirror images or close enough), the IRS will disregard them for estate-tax purposes and treat the assets as if they never left the grantor’s estate.

The logic: if Spouse A transfers $5 million to a trust for Spouse B’s benefit, and Spouse B simultaneously transfers $5 million to a trust for Spouse A’s benefit, are these really independent acts, or is it just an indirect swap? The IRS views such reciprocal trusts with suspicion, particularly if they are identical in terms, amounts, and timing.

If the IRS successfully invokes the doctrine, the entire estate-tax benefit of the SLAT collapses. The assets are pulled back into the grantor’s taxable estate, the valuation discount evaporates, and the lifetime exemption is wasted.

The reciprocal-trust doctrine originated in the 1952 case Lehman v. Commissioner. The IRS doesn’t use it aggressively on every SLAT pair, but it remains a latent threat, and the IRS has challenged high-profile SLATs.

How to Avoid the Reciprocal-Trust Doctrine

Tax advisors have developed several standard defenses:

1. Asymmetry in terms: SLAT 1 and SLAT 2 should differ materially in:

   • Trust duration (e.g., SLAT 1 lasts 20 years; SLAT 2 lasts 30 years).
   • Asset types (e.g., SLAT 1 holds growth stock; SLAT 2 holds bonds and real estate).
   • Trustee structure (different corporate trustees, or one independent trustee vs. corporate).
   • Beneficiary provisions (e.g., SLAT 1 goes to children; SLAT 2 goes to grandchildren).

2. Timing separation: Don’t create both trusts on the same day. Stagger the funding by months or years.

3. Different amounts: Transfer different amounts into each SLAT ($5 million vs. $4 million, not identically matched).

4. Independent decision-making: Document that each spouse independently decided to make the transfer, without coordination or agreement with the other.

5. Unequal access: Ensure the non-grantor spouse’s access rights differ. In SLAT 1, Spouse B might have broad withdrawal rights; in SLAT 2, Spouse A might have limited rights, subject to a trustee’s discretion.

The goal is to create a paper trail showing the trusts are separate, independent transfers driven by each spouse’s individual tax and wealth motives, not a coordinated estate-tax minimization dance.

Practical Mechanics: Who Is the Trustee?

A SLAT typically names a professional corporate trustee to manage distributions. The grantor usually cannot be the trustee (that would pull the assets back into the estate); neither should the non-grantor spouse if he or she is also a settlor of a reciprocal trust (IRS concern about control and coordination).

Instead, the trustee is often a bank, trust company, or an independent third party. This adds cost (trustee fees of 0.5–1.0% annually) but is essential for IRS defensibility.

When SLATs Backfire: The Survivor Risk

A lesser-known hazard: what if the non-grantor spouse (the one with access) dies first? If the trust language isn’t careful, the grantor can suddenly be left without access to the assets, and the trust may have inadvertently sheltered assets the grantor desperately wanted to preserve for his or her own use.

For instance, if Spouse A funds SLAT 1 for Spouse B, and Spouse B dies in year 3, the trust assets are locked away for the children. Spouse A has no access. If Spouse A later faces unexpected health costs or inflation, those assets are unreachable.

Some SLAT structures include a “spousal access switch”: if the non-grantor spouse dies, the trustee can grant the grantor limited access (subject to constraints that preserve tax benefits). This requires careful drafting.

Estate-Tax Exemption Portability and Simplified Alternatives

In recent years, the availability of portability—which allows a surviving spouse to use the deceased spouse’s unused exemption—has reduced the urgency of SLATs for some couples. If exemptions are portable, each spouse can rely on doubling the exemption at the death of the first spouse, without needing a SLAT.

However, portability is not automatic; it requires filing a Form 706 estate-tax return. And if exemptions are set to sunset (the current federal exemption of $13.61 million is scheduled to revert to about $7 million in 2026 under current law), the immediate transfer-and-shelter strategy of a SLAT may still be attractive to lock in today’s exemptions.

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