GRAT vs. SLAT vs. IDGT: Choosing the Right Wealth Transfer Trust in 2026

The landscape of wealth transfer planning shifted materially when the One Big Beautiful Bill Act (OBBBA) was signed into law on July 4, 2025. The “sunset cliff” that would have slashed estate and gift tax exemptions roughly in half on January 1, 2026 was permanently averted — replaced with a new, higher permanent baseline of $15 million per individual ($30 million per married couple), indexed for inflation going forward.

But the elevated exemption doesn’t retire these strategies. For families with estates well above that threshold — and for those using trusts to freeze value, shift income, and move future appreciation without triggering capital gains — the GRAT, SLAT, and IDGT remain indispensable. What changed is the context in which you choose between them.

Here’s how to think about each one in 2026’s rate and exemption environment.

The Rate Environment Is the Starting Point

Before comparing strategies, one number matters most: the §7520 rate for October 2026 is 5.60% (IRS Rev. Rul. 2026-19). Published monthly by the IRS as 120% of the mid-term Applicable Federal Rate (AFR), the §7520 rate is the hurdle a GRAT must clear. For IDGT installment sales, the governing rate is the AFR itself: the mid-term AFR for October 2026 is 4.61% and the long-term AFR is 5.22% (annual compounding, Rev. Rul. 2026-19). These rates change monthly.

At 5.60%, the §7520 hurdle is meaningfully higher than it was during the near-zero rate environment of 2021–2023. That shifts the calculus for which trust type makes sense for a given asset.

GRAT — Grantor Retained Annuity Trust (§2702)

How it works: The grantor transfers assets into an irrevocable trust and retains an annuity payment for a fixed term. When the term ends, whatever remains in the trust passes to heirs — gift-tax free. The taxable gift is measured at funding as the present value of the remainder interest. In a “zeroed-out” GRAT, the annuity stream is sized so that present value equals the amount transferred, reducing the taxable gift to near zero. This technique was established by the Tax Court in Walton v. Commissioner, 115 T.C. 589 (2000), and the IRS acquiesced in 2003.

The core logic: Every dollar of return above the §7520 hurdle rate accumulates inside the trust and exits the taxable estate tax-free. Fund a GRAT with a pre-IPO position that returns 40% while the hurdle sits at 5.60%, and the excess appreciation — everything above what’s needed to fund the annuity payments — leaves the estate without using a dollar of lifetime exemption.

The 2026 environment: With the hurdle at 5.60%, the strategy works best for assets with strong near-term appreciation potential. Assets that merely track broad market returns may come back to the grantor nearly whole. The GRAT is a leverage play on outperformance, not a general-purpose estate freeze.

The critical risk: If the grantor dies before the GRAT term ends, the assets are pulled back into the taxable estate. To manage this, practitioners commonly use rolling two-year GRATs — a new GRAT is funded each year, keeping the mortality exposure short while capturing any year with outsized appreciation.

OBBBA update: Proposed GRAT restrictions — a mandatory 10-year minimum term and a 25% minimum remainder value — were not enacted in the OBBBA. The zeroed-out short-term GRAT remains fully available.

Exemption used: Minimal to none.

SLAT — Spousal Lifetime Access Trust

How it works: One spouse (the donor spouse) makes an irrevocable gift to a trust that names the other spouse (the beneficiary spouse) — and often their children — as beneficiaries. The assets leave the donor’s taxable estate permanently. The beneficiary spouse can receive trust distributions, giving the couple some continued economic access to the transferred assets even though the donor’s direct control is gone.

Why 2026 is the moment for SLATs: Under OBBBA, the lifetime gift tax exemption is now $15 million per individual — $30 million for a married couple. Use it or potentially lose it to future legislative change. A SLAT is the primary vehicle for a married couple to deploy that exemption now, permanently removing assets from both taxable estates while keeping the beneficiary spouse’s access open.

The trust is typically structured as a grantor trust for income tax purposes under IRC §§671–677, meaning the donor spouse pays income tax on trust earnings. Those tax payments aren’t additional taxable gifts — making them a secondary, compounding benefit. Trust assets grow inside without an ongoing income tax drag.

The risks to plan around:

• Divorce. If the marriage ends, the donor spouse has permanently transferred assets to a trust the ex-spouse may still benefit from. Trust drafters can limit or condition distributions, but the risk is real and must be discussed.
• Reciprocal trust doctrine. When both spouses want to create SLATs for each other — a symmetry that’s instinctively appealing — the IRS can invoke the doctrine established in United States v. Grace, 395 U.S. 316 (1969), treating interrelated, economically equivalent trusts as if each grantor retained a beneficial interest in their own trust. The entire structure can collapse. Avoid identical terms, identical asset amounts, and simultaneous execution. Differences in timing, trustee, beneficiary class, and distribution standards all matter.
• No step-up in basis at death. Assets outside the taxable estate don’t receive an income tax basis step-up. For highly appreciated assets, the long-run income tax cost of this tradeoff requires careful analysis.

Best for: Married couples with combined estates significantly above the exemption who want to make large gifts now, lock in today’s enhanced exemption, and retain indirect access through the beneficiary spouse.

IDGT — Intentionally Defective Grantor Trust

How it works: An IDGT is an irrevocable trust that sits outside the grantor’s estate for estate tax purposes, but inside the grantor’s estate for income tax purposes (IRC §§671–677). The trust is “defective” for income tax — typically by giving the grantor a retained power to substitute trust assets — while remaining fully effective for lestate planning.

The installment sale: The most powerful application is a sale of appreciating assets — a business interest, real estate, private equity holdings, closely held stock — to the IDGT in exchange for a promissory note bearing interest at the applicable federal rate (4.61% mid-term for October 2026). Because grantor and grantor trust are treated as the same taxpayer for income tax purposes, the sale is not recognized — no capital gains are triggered on the transfer. The authority is Rev. Rul. 85-13, which holds that transactions between a grantor and a grantor trust are disregarded for income tax.

Going forward, all appreciation above the AFR accrues inside the trust, outside the taxable estate. The trust makes note payments back to the grantor — providing a cash flow stream — while the grantor continues paying income taxes on trust earnings, which functions as an additional untaxed gift to the trust.

Seed money: The IDGT must be adequately capitalized before the installment sale closes. Standard planning practice calls for seed capital of approximately 10% of the purchase price — enough to demonstrate that the trust has genuine economic substance independent of the note.

Key risk: The technique’s effectiveness depends on the trust being respected as a separate entity with real substance. Undercapitalization or aggressive structuring raises the risk of IRS challenge to the installment sale treatment.

Best for: Business owners, founders, and investors with high-appreciation assets and large embedded gains who want to freeze today’s value in the estate and transfer all future appreciation out — without triggering capital gains and without consuming lifetime exemption.

Side-by-Side Comparison

Which Strategy Fits Your Situation

GRAT: You have a high-conviction growth asset — pre-IPO shares, a PE co-investment, a closely held business ahead of a liquidity event — and strong confidence it will outpace a 5.60% hurdle. You’re comfortable with a term-based structure and the mortality risk that goes with it. Rolling two-year GRATs mitigate that risk. No lifetime exemption required.

SLAT: You’re married, your combined estate exceeds $30 million, and you want to permanently move assets outside both estates now while the $15M/$30M exemption is available. You understand that the beneficiary spouse’s access is indirect and that the transfer is irreversible if the marriage ends. Avoid mirror-image SLATs.

IDGT installment sale: You own a business, real estate, or investment portfolio with significant embedded appreciation and you want to freeze your estate at today’s fair market value — without triggering capital gains and without using lifetime exemption. Works for single individuals, founders who have already used their SLAT exemption, and married couples who want to layer in additional estate freezing beyond what the SLAT covers.

These Strategies Stack

None of them are mutually exclusive. A married founder might sell one block of equity to an IDGT — no capital gains, note back at 4.61% — transfer a second block to a rolling two-year GRAT betting on continued appreciation, and layer a SLAT on top to deploy the $15M/$30M exemption with the spouse as beneficiary. The right combination depends on your asset mix, marital status, mortality considerations, and appetite for complexity.

The strategies are complementary precisely because they address different problems: GRATs harvest outperformance, SLATs deploy the exemption with access, and IDGTs freeze value and avoid capital gains.

Coordinating Tax and Legal Counsel

The mechanics of these strategies — trust drafting, note terms, annuity calculations, seed money funding, annual grantor trust reporting — leave little margin for error. At Laléa & Black, we work alongside your estate planning attorney to model the income tax and estate tax consequences before any transfer is made, and to keep the structure maintained and documented over time.

If you’re evaluating whether one or more of these strategies makes sense for your situation, reach out to our team.