Estate Planning for Business Owners

If most of your net worth is tied up in a business you own, estate planning is harder than it looks. Your estate may be worth $12M on paper — but you can't write a check from illiquid equity to pay an estate tax bill. And the strategies that work for marketable securities (annual gifting, SLATs, GRATs) have to be adapted to account for business valuation mechanics. This guide covers the four strategies that matter most for HNW business owners: valuation discounts, IDGT installment sales, buy-sell agreements, and QSBS planning.

Why business owners face a different problem

Two things make business owner estate planning harder than planning for a portfolio of stocks:

1. Illiquidity. A $10M interest in a private S-corp or LLC cannot be easily sold to fund an estate tax bill. If the estate owes $2M in federal tax (40% × amount above $15M exemption), the heirs may have to sell a piece of the business under pressure, accept a forced buyout, or borrow against it. Estate planning for business owners is largely about avoiding that scenario.
2. Valuation complexity. The IRS values your business interest at fair market value — but for fractional interests in private entities, that's not the same as the enterprise value on your cap table. Minority interests trade at a discount to control; illiquid private interests trade at a discount to publicly traded equivalents. Proper valuation engineering, done correctly and documented by a qualified appraiser, can reduce the taxable value of gifts significantly.

Strategy 1: Valuation discounts for annual gifting

If you hold your business through a family limited partnership (FLP) or LLC, fractional interests in that entity qualify for valuation discounts when transferred to heirs or trusts. Two discounts apply:

• Lack of control (minority) discount: A non-controlling interest (say, 20% of an LLC) cannot compel distributions, management decisions, or a sale. Buyers pay less for that. Typical discount range: 20–35% of proportionate enterprise value, depending on entity type and operating agreement terms.
• Lack of marketability (DLOM): Private company interests are not freely tradable. An additional discount (15–25%) reflects the time, cost, and uncertainty of finding a buyer. Combined discounts of 25–45% are commonly supported by qualified appraisal for properly structured FLP/LLC interests.²

In practice: if the business is worth $5M at the entity level, a 20% LLC interest gifted to a trust may appraise at $700K–$800K rather than $1M — letting you transfer more of the enterprise value per dollar of gift-tax exemption used. Multiplied over annual exclusion gifts ($19,000 per recipient in 2026³) and lifetime exemption, this compounds into material savings.

The IRS scrutinizes FLP/LLC valuation discounts aggressively. The structure must be bona fide — real business purpose beyond estate tax savings, no retained control that negates the discount claim, and a contemporaneous qualified appraisal. Treasury regulations and Tax Court cases set the boundaries. This is not a DIY strategy.

Strategy 2: IDGT installment sale

An intentionally defective grantor trust (IDGT) sale is one of the most powerful tools for transferring a growing business out of the estate at minimal gift-tax cost. Here's the structure:

1. You create and fund an IDGT with a seed gift (typically 10–15% of the expected sale price).
2. You sell your business interest to the IDGT in exchange for a promissory note bearing interest at the current applicable federal rate (AFR) — the IRS-published minimum interest rate for intra-family loans, updated monthly.⁴
3. Because the trust is "intentionally defective" — you're still treated as the owner for income tax purposes but NOT for estate tax purposes — the sale is not a taxable event. No capital gains tax is triggered at the time of sale.
4. All future appreciation inside the trust (above the AFR note rate) passes to the trust beneficiaries gift-tax free. The note you hold is a fixed obligation that doesn't grow with the business.

IDGT installment sales work best for businesses with strong growth trajectories — pre-liquidity startups, fast-growing private companies, or real estate portfolios before a major appreciation event. Timing the sale before a valuation spike maximizes the transfer efficiency. See the trust strategies comparison guide for how IDGTs compare to GRATs and SLATs.

Strategy 3: Buy-sell agreement

A buy-sell agreement governs what happens to a business owner's interest at death, disability, divorce, or retirement. It's both a succession planning tool and an estate planning tool:

• Estate tax: A properly structured buy-sell agreement can peg the value of the interest for estate tax purposes (within limits — the IRS requires the price to reflect fair market value, not a suppressed artificial number).
• Liquidity: If the agreement is funded by life insurance, it creates the cash needed to buy out a deceased partner's estate — preventing forced sales or the estate becoming a passive partner in the business.
• Two main structures:
  • Cross-purchase agreement: Co-owners buy each other's interest at death. Each owner holds insurance on the others. At death, survivor uses insurance proceeds to buy the deceased's interest — survivor gets a stepped-up basis in the acquired interest.
  • Entity redemption agreement: The business itself buys back the deceased's interest using entity-owned life insurance. Simpler with many owners; no step-up in basis benefit for survivors.

For S-corps, entity-owned life insurance can trigger AMT exposure (C-corps) or create basis complications. Work with a CPA who knows the entity type before choosing a structure. Life insurance held inside an ILIT rather than personally can keep the proceeds out of both the business owner's and each co-owner's estate.

Strategy 4: QSBS exclusion (C-corps only)

If your business is structured as a C-corporation and you've held the stock for at least three years, IRC §1202 — the Qualified Small Business Stock exclusion — can shield a material gain from federal capital gains tax. The OBBBA (July 2025) raised the exclusion to $15M with tiered rules:¹

• 3-year hold: exclude 50% of gain (up to $15M exclusion × 50%)
• 4-year hold: exclude 75%
• 5-year hold: exclude 100% — up to $15M of gain entirely excluded from federal tax

QSBS applies at the time of sale, not at death (the step-up resets basis at death, eliminating the need for QSBS on inherited shares). The exclusion is per-taxpayer per-issuer — married couples can each exclude $15M, and gifting QSBS shares to children or a trust before a liquidity event can multiply the exclusion across family members. The company must have had aggregate gross assets under $50M at the time of stock issuance, and the stock must have been acquired in an original issuance (not secondary market).

QSBS planning is primarily for C-corp founders and early employees. S-corp, LLC, and partnership interests don't qualify — though converting to C-corp before a funding round may be possible in some circumstances.

The step-up in basis question

One reason business owners hesitate to gift business interests is that gifted assets carry carryover basis — your heirs inherit your low cost basis and pay capital gains tax when they eventually sell. Assets held until death receive a stepped-up basis at fair market value, eliminating the embedded gain entirely.

The estate-vs-gift trade-off: if the estate is below the $15M federal exemption, holding appreciated assets until death is usually optimal (step-up outweighs the estate tax benefit of gifting). For estates above $15M, moving appreciated assets out of the estate saves 40% estate tax on the appreciation above exemption — even after giving up the step-up. Use the step-up basis calculator to model the break-even for your numbers.

Who coordinates this

Business owner estate planning requires three specialists working together:

• Trust-and-estates attorney: Drafts the IDGT trust document, IDGT promissory note, buy-sell agreement, and any FLP operating agreement.
• CPA / tax advisor: Models the income tax consequences, S-corp vs. C-corp implications, QSBS eligibility analysis, and annual income tax reporting for grantor trusts.
• Fee-only financial advisor (estate planning specialist): Quarterbacks the overall plan — projecting estate tax exposure, modeling gifting scenarios, stress-testing assumptions, and coordinating with the attorney and CPA so the financial plan aligns with what the legal documents can actually accomplish.

Getting the pieces designed by people who don't talk to each other is how expensive mistakes happen. The most common: an attorney drafts a trust the CPA didn't review (wrong grantor election), or a buy-sell agreement is funded with the wrong insurance structure.

Sources

1. One Big Beautiful Bill Act (OBBBA), Pub. L. 119-__, July 2025 — permanently set federal estate, gift, and GST exemption at $15M (inflation-indexed from 2027); raised IRC §1202 QSBS exclusion to $15M with 50/75/100% tiers at 3/4/5-year hold. congress.gov
2. IRS, Estate and Gift Taxes; Restrictions on Liquidation of an Interest (Prop. Reg. §25.2704-2 and §25.2704-3). Tax Court cases applying fractional interest discounts: Estate of Stone v. Commissioner, T.C. Memo 2012-48; Cavallaro v. Commissioner, T.C. Memo 2014-189. Discount ranges are subject to facts and circumstances and qualified appraisal. irs.gov
3. IRS Rev. Proc. 2025-32: 2026 annual exclusion $19,000 per donor per recipient ($38,000 per couple); 529 superfunding $95,000/$190,000 (5-year election). IRS IRB 2025-45
4. IRS Applicable Federal Rates (AFR) — published monthly in IRS Revenue Rulings. Short-term, mid-term, and long-term rates govern minimum interest for intra-family loans and installment sales. See current month's IRS Rev. Rul. for exact rates: irs.gov/applicable-federal-rates

Factual values verified as of April 2026. OBBBA provisions per enacted legislation. Discount ranges reflect typical appraiser-supported values in Tax Court litigation — your actual discount depends on entity structure, operating agreement, and qualified appraisal. This page is for informational purposes only and does not constitute legal, tax, or financial advice.