SLAT Trust Cost: Setup and Ongoing Fees

A spousal lifetime access trust does not come with a sticker price. Setup runs anywhere from $3,000 for a stripped-down single trust to $15,000 or more for a non-reciprocal dual-SLAT structure holding business interests, and that is before the first annual trustee invoice arrives. For families weighing whether to lock in the 2026 federal estate tax exemption of $15 million per person, the relevant question is not whether a SLAT is expensive. It is whether the cost is trivial relative to the tax it defers — and for most $150k+ households, the honest answer depends entirely on net worth and what Congress does next.

The marketing around SLATs leans hard on urgency that mostly evaporated in July 2025. So this analysis strips the sales pitch and looks only at what the structure costs to build, what it costs to keep, and what tax exposure it actually addresses under current law.

The numbers that matter

Sources: Heritage Law Office; Nevada Trust Company (2025); UltraTrust; LegalClarity (Apr 2026); IRS, “What’s New — Estate and Gift Tax” (2026). Setup figures are blended ranges across published attorney pricing; trustee and tax-prep figures reflect typical professional ranges.

What changed in 2025, and why the urgency mostly disappeared

Most SLAT content still circulating online was written for a deadline that no longer exists. The premise ran like this: the Tax Cuts and Jobs Act had roughly doubled the federal estate tax exemption, that increase was scheduled to sunset at the end of 2025, and the exemption would revert to approximately $7 million per person. Move assets into a SLAT before the cliff, the argument went, and you lock in the higher exemption permanently.

The cliff never arrived. TCJA sunset exemption changes were overtaken by the One Big Beautiful Bill Act, signed into law on July 4, 2025 as Public Law 119-21. OBBBA amended the basic exclusion amount to $15,000,000 for calendar year 2026. The IRS confirms the figure directly: the 2026 federal estate tax exemption data sets the per-person exemption at $15 million, $30 million for a married couple. The $15 million federal basic exclusion amount was made permanent — meaning it will not revert absent Congressional action — and it will be adjusted for inflation annually.

That single legislative change resets the entire SLAT cost-benefit calculation. The “use it or lose it” framing that justified rushing into a $10,000 trust structure in 2024 no longer holds the same force. What remains is a quieter, more durable rationale: moving appreciating assets — and their future growth — outside the taxable estate, plus the asset-protection and control features that have nothing to do with any sunset. The cost of the structure did not change. The reason for paying it did.

The setup cost, component by component

A SLAT is a species of irrevocable trust, and its setup pricing tracks the broader irrevocable trust market rather than any SLAT-specific premium. The drafting is what you pay for, and drafting cost scales with complexity.

At the simple end, a basic irrevocable trust with one or two beneficiaries, common assets, and standard distribution language runs $2,000 to $5,000. In 2025, the cost to establish a standard irrevocable trust through legal drafting typically falls within $3,000 to $7,500. A SLAT rarely sits at the absolute bottom of that band, because the drafting cannot be boilerplate — the entire structure depends on giving the grantor indirect access through the beneficiary spouse without pulling the assets back into the taxable estate, which requires deliberate, custom language.

Cost climbs sharply when a couple wants two SLATs. Each spouse can create a trust benefiting the other, but the trusts cannot be mirror images. If two SLATs are used, clients and their attorneys must avoid the reciprocal trust doctrine, which allows the IRS to treat two overly similar or interrelated trusts as if each spouse set up a trust for their own benefit — which would collapse the entire tax benefit. No court has drawn a bright line on how different is different enough, and the IRS has not issued definitive guidance, making this genuinely uncertain territory. Drafting two trusts that are deliberately, defensibly different — varying trustees, beneficiaries, funding dates, and distribution terms — is not twice the work of one. It is more, because it demands judgment a template cannot supply. This is where setup costs cross into the $7,500–$15,000+ range that high-net-worth families with business interests actually pay.

Three add-on costs sit outside the drafting fee and are easy to overlook. Asset transfer and retitling: deeds for real property, re-registration of securities, and custodian transfer fees each carry their own charges, often several hundred to a few thousand dollars per asset. Appraisals: any non-cash asset gifted to the trust — a closely held business interest, real estate, an art collection — needs a qualified valuation to support the gift tax return, and business valuations in particular are a meaningful line item. Gift tax return preparation: funding a SLAT is a reportable gift, so a Form 709 is filed for the year of funding even when no tax is owed.

The ongoing cost most projections understate

Setup is a one-time number that gets all the attention. The recurring cost is where a SLAT quietly becomes expensive, and it is where the math turns on a single decision: who serves as trustee.

A family member or trusted friend can serve as trustee for free or a nominal fee. A professional or corporate trustee — a bank, trust company, or professional fiduciary — charges a percentage of assets under management. Professional trustee fees typically range from roughly 0.5% to 1% of trust assets annually, varying with the trust’s complexity and the institution involved. Some corporate trustees push toward 2% on smaller or more complex trusts. On a SLAT funded with $5 million, a 1% trustee fee is $50,000 per year — every year, for the life of the trust. Over a 20-year horizon, that is a million dollars in trustee fees alone, before any other cost.

Layered on top is annual tax compliance. A SLAT is typically structured as a grantor trust, which means its income is reported on the grantor’s personal return rather than the trust paying its own income tax — a feature that lets the grantor’s payment of the trust’s income tax further reduce the taxable estate. But the trust still generally files, and trust accounting still has to happen. Trust tax return preparation runs $500 to $2,500 per year, with ongoing bookkeeping and accounting adding $500 to $5,000 or more depending on complexity. Periodic legal reviews to keep the trust compliant with changing law add an irregular but real expense.

The understated truth in most SLAT projections: with a professional trustee, the cumulative ongoing cost dwarfs the setup fee within a few years. A $10,000 setup looks like the headline number. On a $5 million trust with a corporate trustee, year one’s combined trustee and compliance cost can match or exceed that setup fee, and it repeats annually. The setup is the down payment; the trustee fee is the mortgage.

Finluxy Estate Tax Exposure Index

The proprietary metric for this cluster estimates federal estate tax owed if the person died today versus under a reduced-exemption scenario. The original framing assumed a scheduled 2026 sunset to roughly $7 million per person. That sunset did not happen — OBBBA set the 2026 exemption at $15 million and made it permanent. The Exposure Index below therefore models current law against a discretionary future-repeal scenario, since the transfer tax rules remain subject to future legislative change and Congress can lower the exemption at any time. The reduced-exemption column uses approximately $7 million per person ($14 million married) — the level the exemption would have reverted to absent OBBBA, and a reasonable proxy for a future legislated rollback.

All figures assume a married couple, the full $30 million combined 2026 exemption under current law, a 40% top estate tax rate, and no prior taxable gifts. A SLAT’s relevance is that assets gifted into it — plus their appreciation — sit outside the taxable estate in the reduced-exemption scenario, which is precisely where the exposure lives.

Calculation: (combined net worth − available exemption) × 40%. Current-law exemption $30M (IRS, 2026, per OBBBA P.L. 119-21). Reduced-exemption column uses ~$14M combined as a proxy for a future legislated rollback. Illustrative; ignores deductions, state estate tax, and prior gifts.

The pattern is the analytical core of the SLAT decision. Under current law, every household up to $30 million owes zero federal estate tax — which is exactly why the 2025 urgency collapsed. The exposure is entirely conditional on a future law change. A couple worth $15 million has zero current liability and $400,000 of conditional risk; a couple worth $25 million carries $4.4 million of conditional risk. The SLAT is, in effect, an insurance premium paid against the possibility that the $15 million exemption does not survive a future Congress.

When the cost is justified — and when it is not

Run the two numbers against each other. For a $25 million couple, a $15,000 setup plus, say, $60,000 a year in trustee and compliance costs on a $10 million funded SLAT is real money — but it sits against $4.4 million of conditional estate tax exposure plus the removal of all future appreciation on the gifted assets from the estate. If the assets are expected to grow meaningfully, the appreciation moved outside the estate often dwarfs both the tax exposure and the trust’s running cost. SLATs work best for couples with combined assets approaching or exceeding the federal exemption threshold, particularly when a significant portion is expected to appreciate.

For a couple at $10 million or below, the calculus inverts. There is no current federal exposure, no exposure even under a $14 million reduced-exemption scenario, and the ongoing trustee cost is pure expense with no offsetting federal tax saved. The remaining justifications are non-tax: asset protection from future creditors and the certainty of moving wealth outside a potentially shrinking exemption. Those can be valid reasons, but they are not the estate-tax-savings story the marketing tells, and they should be priced honestly as what they are.

Compared with the alternatives, a SLAT occupies a specific niche. Annual gifting strategy mechanics using the $19,000-per-recipient exclusion move wealth out of the estate with zero trust cost, but slowly. A GRAT tax arbitrage structure targets appreciation with a different risk profile and a different fee load. An ILIT for life insurance proceeds solves a narrower problem. The SLAT’s distinguishing feature — and its entire reason for existing over a plain irrevocable gift trust — is indirect access: the grantor can still benefit, through the spouse, from assets technically removed from the estate. That access is the product. It is also the single point of failure, because it disappears entirely on divorce or the beneficiary spouse’s death.

Methodology

For the $150k+ household

Income near $150k–$300k with net worth under roughly $10 million faces essentially no federal estate tax exposure in 2026, which means a SLAT is rarely a tax decision at that level — it is an asset-protection or wealth-transfer-control decision that should be priced and justified on those terms, not on estate tax savings that do not exist. The households for whom the cost math works are the upper end of the $5M–$25M range, particularly those holding rapidly appreciating assets like a growing business or concentrated equity, where moving future growth outside the estate is the real prize and the $400,000-to-$4.4-million conditional exposure is large enough to insure against.

The threshold decision is irreversibility against a permanent-but-not-guaranteed exemption. Because the $15 million exemption is now permanent rather than sunsetting, the pressure to act before a deadline is gone — which is itself valuable, since it lets the decision be made deliberately rather than under a manufactured clock. A SLAT locks assets away forever in exchange for tax positioning that current law does not require and a future Congress might. Before funding one, the practical sequence is to model your own Exposure Index at your actual net worth, get a flat-fee setup quote and a written annual-cost estimate from an estate planning attorney, compare that all-in lifetime cost against your conditional tax exposure, and weigh whether cheaper tools — annual gifting, direct tuition and medical payments, or a simpler irrevocable structure — reach your goals without the trustee bill. Reading a estate planning cost guide for $5M to $25M alongside a CPA’s projection of your asset growth will tell you more about whether a SLAT earns its keep than any urgency-driven illustration will.