Estate Planning Before a Business Sale: GRAT, IDGT, and Gifting Strategies

A business sale is a one-time event that crystallizes value — and permanently closes some planning windows. An estate plan designed after the close can reduce future taxes on the wealth you receive, but it cannot undo the gift or estate tax cost of transferring the business itself at peak value. The most powerful transfer strategies work on pre-sale stock, when the asset is worth $10M on paper and the deal is not yet signed.

The 2026 estate planning foundation

Two numbers anchor all estate planning strategy for business owners in 2026:

• Federal lifetime gift and estate exemption: $15,000,000 per person ($30M for married couples combined). This is the amount you can transfer — during life or at death — without federal gift or estate tax. Under the One Big Beautiful Bill Act (OBBBA, enacted July 2025), this $15M threshold is permanent. The TCJA's 2026 sunset that would have cut the exemption roughly in half no longer applies.¹
• Annual gift tax exclusion: $19,000 per recipient in 2026. Married couples can combine exclusions to give $38,000/year per recipient with no gift tax consequences and no reduction of the lifetime exemption.²

For most business owners, the estate tax problem doesn't arise on a $10M exit — after capital gains taxes, the net estate stays near or below the $15M threshold. But owners with businesses worth $20M–$50M+ will create substantial taxable estates after the sale. For them, pre-sale planning is the primary lever: post-sale cash is the hardest asset class to transfer at a valuation discount, and appreciation that happened before the sale cannot be retroactively transferred.

Why pre-sale timing is irreversible

Most estate transfer strategies work by moving assets out of your estate before they appreciate to their peak value. Once the sale closes:

• Cash has no discount opportunity. A $5M wire from the buyer is worth $5M for gift tax purposes. A 15% minority interest in a closely held operating company might be valued at 20–30% below its pro-rata share — a $5M interest could be gifted at a $3.5M taxable value. That discount disappears after the sale.
• The appreciation window closes. A GRAT transfers the appreciation above the hurdle rate to heirs tax-free. If the business grows from $8M to $15M pre-sale, that $7M appreciation can be shifted out of your estate. Post-close, there's no appreciating asset left to transfer.
• The step transaction doctrine limits last-minute moves. Just as with CRT planning, contributing stock to a trust after a sale is essentially certain — buyer identified, LOI signed, price agreed — creates IRS risk that the transfer is recharacterized as if you received cash and then transferred it. The binding-commitment problem applies here too.

The window for effective estate planning is 2–5 years before the sale, not 60 days before closing.

Direct gifting of business interests

The most straightforward approach: give shares of your business directly to children, a trust for their benefit, or other family members before the sale.

• Annual exclusion gifts: $19,000 per recipient in 2026, with no gift tax return required. Two parents gifting to three children: $114,000/year in business stock transferred with no tax consequences and no lifetime exemption use. Over five years: $570,000 — meaningful for a smaller business.
• Lifetime exemption gifts: A lump-sum gift of business interests that uses part or all of the $15M lifetime exemption. Gifting $10M of stock today uses $10M of exemption, but removes that $10M — plus all future appreciation — from your taxable estate permanently.
• Valuation discounts on minority interests: Gifting a 15% LLC interest may be valued below its pro-rata share for gift tax purposes — discounts of 15–35% for lack of control and lack of marketability are common, supported by qualified appraisal. At a 25% discount, a $2M pro-rata interest is valued at $1.5M for gift tax, letting you transfer more value per dollar of exemption used. The IRS actively scrutinizes these structures under IRC §§2703–2704 — a non-tax business purpose for the entity is essential.³

GRAT: transfer appreciation above the hurdle rate

A Grantor Retained Annuity Trust (GRAT) is an irrevocable trust to which you transfer assets, then receive back fixed annuity payments for a set term. If the transferred assets grow faster than the IRS §7520 hurdle rate, the excess appreciation passes to your heirs estate- and gift-tax free.

GRATs are most powerful for businesses expected to appreciate significantly before a sale — a SaaS company growing EBITDA, a distribution business with a pending strategic offer, or a practice in the final years of EBITDA normalization before an M&A process. The grantor must survive the GRAT term (death during the term pulls the assets back into your estate), which is why short-term GRATs of 2–5 years are most common. Under IRC §2702, the annuity must be a fixed dollar amount paid at least annually; there is no minimum term.⁵

The "zeroed-out GRAT" — where annuity payments are sized to return the present value of the contribution at the §7520 rate — produces a near-zero taxable gift, allowing unlimited use without consuming the $15M exemption. Rolling short-term GRATs (re-funding the trust each cycle) is a common strategy for owners who expect the business to appreciate steadily over several years before the exit.

IDGT: sell business interests to a trust, income-tax free

An Intentionally Defective Grantor Trust (IDGT) is an irrevocable trust that is "defective" for income tax purposes but complete for estate tax purposes. Translation: the trust's income is taxed to you (the grantor), but the trust assets are outside your taxable estate.

The most powerful application in business exit planning is an installment sale to the IDGT:

1. Fund the IDGT with a "seed gift" of approximately 10% of the expected transaction value — this establishes economic substance for the trust. The seed gift uses lifetime exemption or annual exclusions.
2. Sell a much larger portion of your business stock to the IDGT at fair market value, in exchange for an installment promissory note at the applicable federal rate (AFR). Because the IDGT is a grantor trust, this sale is not a taxable event — no capital gains tax on the transfer to the trust.
3. The trust holds the stock and sells it in the business sale transaction. The trust uses the proceeds to repay your installment note (principal + interest at AFR) and retains the appreciation above the note amount.
4. You pay the trust's income taxes on the business sale gain — which is an additional tax-free gift, since paying another party's taxes is not treated as a gift under IRC §677 grantor trust rules. This payment reduces your taxable estate by the amount of taxes paid.

An IDGT note sale allows you to transfer far more value than a GRAT for the same exemption used, because most of the transfer is structured as a sale (not a gift). It works best for owners with significant appreciated stock who want to shift a large block of value and have time to let the trust grow before the sale.⁶

SLAT: access trust assets through your spouse

A Spousal Lifetime Access Trust (SLAT) is an irrevocable trust funded by one spouse for the benefit of the other. The grantor spouse makes a completed gift to a trust for the beneficiary spouse — removing those assets from the grantor's taxable estate — while the beneficiary spouse retains access to trust distributions.

• Each spouse can fund a SLAT, effectively using both spouses' $15M exemptions ($30M combined) before the sale converts business stock to cash at known high value.
• The primary risk: if the spouses divorce or the beneficiary spouse predeceases the grantor, the grantor loses all access to the assets. This is the hard trade-off in any SLAT strategy.
• Married couples funding two SLATs must be careful to avoid the "reciprocal trust doctrine" — nearly identical trusts with each spouse as the other's beneficiary may be collapsed for estate tax purposes by the IRS. Structuring variations (different trustees, different distribution standards, different funding dates) are required.

SLATs are commonly used by married business owners in the $15M–$30M estate range who want to fully utilize both federal exemptions before the sale.

Estate planning vs. income tax: the step-up trade-off

Estate planning and income tax planning are not independent — they create a specific trade-off that must be modeled with your actual numbers:

• Step-up in basis at death: Assets that pass through your estate at death receive a full step-up in cost basis to FMV at the date of death. For highly appreciated business stock, this eliminates the embedded capital gains entirely. If you die owning $10M of stock with a near-zero basis, your heirs inherit it at $10M basis and owe no capital gains if they sell immediately.
• The estate tax vs. step-up trade-off: For estates well under the $15M threshold, holding appreciated assets until death is often optimal — you get the step-up with no estate tax cost. For estates substantially above $30M (MFJ), the 40% estate tax cost on the excess far outweighs the capital gains benefit of the step-up, and lifetime transfers make sense even at the cost of carryover basis.
• Carryover basis on lifetime gifts: When you gift business stock and the recipient later sells it, they take your original basis. The deferred capital gains are eventually paid — just by the recipient, potentially at a lower rate. For QSBS-eligible stock, this can be used strategically: gifting to multiple non-grantor trusts before the sale multiplies the $15M per-taxpayer QSBS exclusion cap. See the QSBS stacking guide.

Strategy comparison

Planning timeline

• 5+ years before sale: Optimal window for GRATs (maximum appreciation runway) and IDGT note sales. Establish trusts, begin annual gifting, consider restructuring the entity to create giftable minority interests with legitimate business purpose. QSBS stacking via non-grantor trusts requires the trust to hold stock long enough to satisfy its own 5-year holding period.
• 2–3 years before sale: Execute SLATs if married. Fund rolling short-term GRATs. Run the estate-tax-vs-step-up trade-off model with updated valuations. Begin coordinating with estate attorney and M&A counsel to map the deal timeline against planning windows.
• 12–18 months before sale: Last practical window for GRATs with meaningful appreciation runway. Annual exclusion gifting still fully available. Begin identifying whether any minority-interest discounts are defensible with current business structure.
• After LOI is signed: Transfers of stock covered by the pending deal are difficult to execute without IRS scrutiny. Shift focus to post-sale strategies: ILIT funding, marketable-securities gifting, and qualified opportunity zone investments with the realized gain.

What a specialist exit-planning advisor provides

Estate planning before a business sale sits at the intersection of M&A, income tax, and estate law. Most M&A attorneys don't model the estate tax impact of deal structures. Most estate attorneys don't integrate with the deal timeline. A fee-only advisor specializing in business exits provides:

1. Quantified trade-off modeling. Side-by-side comparison of: hold to death for step-up vs. gift now using exemption vs. sell and invest the after-tax net. The right answer changes dramatically between a $15M and a $40M business, and depends on your life expectancy, estate composition, and heirs' situations.
2. Strategy sequencing. GRATs and IDGTs need years of runway before the sale crystallizes the value. The advisor maps which strategies have the longest lead times and prioritizes execution around your anticipated sale timeline — not generic planning timelines.
3. Cross-advisor coordination. The estate attorney drafts the trusts. The CPA models income tax impact. The M&A attorney structures the deal. The exit-planning advisor's role is to ensure these three coordinate rather than each optimizing a single dimension — a GRAT that reduces estate exposure but creates carryover basis problems in QSBS stock isn't actually optimal.