SLATs for Estate Tax Planning: 2026 Rate Increase Strategy
Bonustify ยท March 8, 2026
Spousal Lifetime Access Trust (SLAT): A Powerful Estate Tax Strategy for High-Net-Worth Couples
A Spousal Lifetime Access Trust (SLAT) is an irrevocable trust that lets one spouse gift assets to benefit the other spouse, removing those assets and all future appreciation from your taxable estate permanently. Based on current rates, the federal estate tax exemption is $13.99 million per individual in 2025 and, according to available data, may rise to $15 million per individual in 2026 under the One Big Beautiful Bill Act (OBBBA). High-net-worth couples may have a powerful window to lock in generational wealth transfers before any future legislative changes. This guide explains exactly how SLATs work, who should use them, and how to compare them against other wealth transfer strategies.
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What Is a SLAT and Why Does It Matter Right Now?
A SLAT lets you use your lifetime gift and estate tax exemption today. You gift assets into the trust, your spouse can access distributions during their lifetime, and the remainder passes to your children or other heirs estate-tax-free.
The key opportunity: according to available data, the 2026 exemption may rise to $15 million per individual (or $30 million per married couple) under the OBBBA. Based on current legislative information, this appears to be a permanent increase, indexed for inflation going forward. Couples who act now can use the current $13.99 million per individual (2025) exemption and potentially shield all future appreciation from the 40% federal estate tax rate. Every dollar of appreciation that occurs inside the trust is potentially outside your taxable estate.
How a SLAT Works: Step-by-Step
Step 1: Establish and Fund the Trust
The donor spouse creates an irrevocable trust and transfers assets into it. Common assets include cash, securities, real estate, business interests, and life insurance. Assets must be individually owned, not held jointly or as community property.
You report the gift on IRS Form 709, applying your lifetime exemption. If the gift stays under your exemption limit, no gift tax is typically due.
Step 2: Beneficiary Spouse Receives Access
The beneficiary spouse can receive income and principal distributions from the trust. Most SLATs generally use a HEMS standard, meaning distributions are limited to health, education, maintenance, and support. This gives the donor spouse indirect access to funds while keeping assets outside both spouses’ taxable estates.
Fiduciary Trust notes that the trust may be most tax-efficient when the beneficiary minimizes distributions, allowing assets to compound inside the trust.
Step 3: Grantor Trust Tax Treatment
A SLAT is typically structured as a grantor trust. This means the donor spouse generally pays all income and capital gains taxes on trust assets through their personal tax return. The trust itself typically pays no income tax.
This can be a significant benefit. Every dollar of tax the donor pays may function as an additional tax-free gift to the trust, because the trust keeps 100% of its earnings to compound. The trust grows unburdened while the donor’s taxable estate potentially shrinks.
Step 4: Assets Pass to Heirs
When the beneficiary spouse dies, the remaining trust assets pass to children or other named beneficiaries. You can also typically apply the Generation-Skipping Transfer (GST) exemption at funding, potentially sheltering assets across multiple generations.
The Power of Compounding Inside a SLAT
The math behind SLATs can be compelling. According to the NAEPC Journal, gifting $13.61 million into a SLAT twenty years before death, assuming 7% annual appreciation, may grow the trust to approximately $52.67 million. At the 40% federal estate tax rate, that could represent approximately $21.07 million in potential estate tax savings.
Even smaller gifts can produce meaningful results. Because the donor typically pays the income taxes personally, the trust compounds at the full pre-tax rate. That annual tax payment may function as a bonus gift that never touches your exemption.
Dual SLAT Strategy: Doubling Your Protection
Many couples use reciprocal SLATs, sometimes called “mirror SLATs.” Each spouse creates a separate SLAT naming the other as beneficiary. This can double the exemption used and diversify risk.
A Charles Schwab example illustrates the strategy. A couple with $35 million in assets each transfers $13.99 million into separate SLATs in 2025. That could protect $27.98 million plus all future appreciation. The couple retains roughly $7.02 million in accessible assets, supplemented by HEMS distributions from either trust.
Important caution: The IRS may challenge reciprocal SLATs if they are too identical. Varying the terms, trustees, funding dates, and asset types between the two trusts can help reduce this risk.
SLATs vs. Other Wealth Transfer Strategies
Choosing the right strategy depends on how much access you need and how complex your estate is. Here is how SLATs generally compare to the main alternatives.
| Strategy | Estate Tax Shelter | Spouse Access | Key Drawback |
|---|---|---|---|
| SLAT | Full exclusion plus appreciation | Indirect via HEMS distributions | Irrevocable; divorce risk |
| Standard Irrevocable Gift Trust | Full exclusion plus appreciation | None for donor or spouse | Zero liquidity for couple |
| Intentionally Defective Grantor Trust (IDGT) | Growth outside estate; grantor pays taxes | No beneficiary access | Requires seed gift; complex valuation |
| Dynasty Trust | GST exemption shelters multiple generations | Limited distributions | State perpetuity rules; less spouse access |
SLATs may stand out when you need the estate tax benefits of an irrevocable trust but still want your spouse to have access to funds during their lifetime. If liquidity is not a concern, a standard irrevocable gift trust may be simpler. If you want to sell assets to a trust rather than gift them, an IDGT may fit better.
For more on strategies that pair well with estate planning, see our guide on how to use Qualified Opportunity Zone investments to defer capital gains tax.
Key Risks and Limitations to Know
No Step-Up in Cost Basis
Assets gifted to a SLAT typically retain the donor’s original cost basis. There is generally no step-up at either spouse’s death. If you gift low-basis stock that later sells inside the trust, the trust (or beneficiaries) will typically owe capital gains tax on the full appreciation. Weigh this against the estate tax savings before funding with highly appreciated assets.
Divorce Risk
If you divorce, the beneficiary spouse typically loses access to the SLAT. The assets remain in trust for the remaindermen (typically your children), but your former spouse can generally no longer receive distributions. Consider adding “floating spouse” language to the trust document, which redefines the beneficiary as your current spouse at any given time.
Irrevocability
Once funded, you generally cannot take assets back. The donor relinquishes all direct control. An independent trustee manages investments and distributions. Make sure you are comfortable with this before transferring significant assets.
Income Tax Burden
The donor typically pays 100% of the trust’s income and capital gains taxes at personal rates (up to 37% federal plus applicable state rates). This is usually a benefit because it can reduce your taxable estate, but it may create cash flow pressure if the trust holds high-income assets.
Who Should Consider a SLAT?
SLATs may work best for couples who meet most of these criteria.
- Combined net worth well above the exemption threshold. A couple with $35 million in assets, for example, may have significant exposure to the 40% estate tax on amounts above the $30 million combined exemption.
- Long investment horizon. The compounding benefit can grow dramatically over 15 to 20 years.
- Comfort with irrevocability. You must be willing to permanently transfer assets.
- Stable marriage. Divorce eliminates the beneficiary spouse’s access.
- Strong income to cover trust taxes. The grantor trust structure typically requires the donor to pay taxes on trust earnings from outside assets.
Frequently Asked Questions
Can I access SLAT funds if I need them?
You generally cannot access the trust directly as the donor. However, your spouse (as beneficiary) can typically receive HEMS distributions, which may indirectly benefit your household. Keep distributions limited to genuine needs to help preserve the estate tax exclusion. Excessive distributions may reduce the compounding advantage inside the trust.
What happens to a SLAT if we divorce?
Your former spouse typically loses access to distributions. The trust assets remain protected for the remainder beneficiaries, typically your children. To guard against this, ask your attorney to include “floating spouse” language or consider whether reciprocal SLATs better fit your situation.
What assets are best to fund a SLAT with?
Appreciating assets with long growth runways generally work best, such as business interests, real estate, and growth stocks. Life insurance may also be effective because the death benefit passes income-tax-free. Avoid jointly held or community property, which must be converted to individual ownership before transfer.
What is the deadline to use the 2025 exemption amount?
The 2025 exemption is $13.99 million per individual. According to available data, the 2026 exemption may rise to $15 million per individual under the OBBBA. Gifts are typically complete upon transfer, so consider funding the trust before December 31, 2025, to use the current exemption amount. Work with an estate planning attorney well in advance to allow time for drafting, appraisals, and funding.
Are SLATs subject to state estate taxes?
SLATs are primarily a federal estate tax strategy. State rules typically vary significantly. Some states have their own estate taxes with lower exemption thresholds. Check your state’s rules with a local estate planning attorney before finalizing your strategy.
Bottom Line
A SLAT may be one of the most effective tools available to high-net-worth couples who want to reduce estate taxes while keeping some access to gifted assets. Based on current rates, the 2025 exemption is $13.99 million per individual and, according to available data, may rise to $15 million in 2026. The opportunity to potentially shelter tens of millions of dollars and all future appreciation from the 40% federal estate tax may be significant. Reciprocal SLATs can potentially double your protection to $27.98 million today. The tradeoffs are real: no basis step-up, irrevocability, and divorce risk. But for couples with substantial estates and a long time horizon, the compounding math can be compelling. Start the conversation with a qualified estate planning attorney now. The sooner assets enter the trust, the more appreciation you may shelter permanently.
This article is for educational purposes only and does not constitute personalized financial, tax, or legal advice. Consult a qualified professional before making estate planning decisions.