The estate tax is rarely the thing that kills a closely held company. The buy-sell agreement nobody updated usually gets there first.
More than half of U.S. small-business owners are now over age 55, up roughly 30% since the early 2000s, and one in four is 65 or older. McKinsey projects annual small-business exits could run 42% above 2011 levels by 2035, reaching as many as 665,000 per year. Surveys put the share of boomer owners with a formal written succession plan at somewhere between a third and a half, depending on who is counting and how loosely they define a plan.
Those two facts collide in a specific way. Retirement exits get planned badly. Death exits get planned not at all, and they arrive without a diligence period, a data room, or a seller who can answer questions.
The tax code is not the main villain here. With the federal exemption at $15 million per person and $30 million per couple in 2026, most owners will never owe federal estate tax. What actually goes wrong is control, liquidity, and valuation, usually in that order and usually inside the first 60 days.
This is what happens mechanically when the owner of a closely held business dies, what the Supreme Court changed in 2024 about life-insurance-funded buy-sells, and which documents decide the outcome before anyone talks to a lawyer.
The First 30 Days Are a Control Problem, Not a Tax Problem
Ownership and management separate at death, and most owners have never thought about the gap. The equity passes to the estate, which is controlled by the executor named in the will. Operating authority passes according to the operating agreement, the bylaws, or nothing at all.
That gap is where companies stall. The executor may be a spouse with no operating experience who now holds voting control. The general manager who actually runs the place may hold no authority to sign anything. Banks freeze accounts held in the decedent’s name, payroll is due Friday, and the person with signature authority is the person who died.
Three documents decide how bad this gets: the operating agreement or bylaws, the buy-sell agreement, and the bank’s signature card. A sole proprietorship is the worst case, since there is no entity to survive the owner and the business is simply a pile of assets inside an estate. Single-member LLCs are nearly as fragile unless the operating agreement names a successor manager.
Key-person insurance solves a different problem than a buy-sell does. The buy-sell funds the purchase of the deceased owner’s equity. Key-person coverage is payable to the company for operating continuity, covering the revenue hit, the search for a replacement, and the lender who just discovered its borrower died. Companies that carry one and not the other usually discover the gap at the worst moment. The startup legal guide covers the document set every owner should have on file before any of this is urgent.
The Buy-Sell Agreement Decides Almost Everything
A buy-sell agreement answers three questions in advance: who may buy the deceased owner’s interest, at what price, and with what money. Agreements that answer the first two and skip the third are the most common failure mode in closely held companies.
Structure | How it works | Estate tax effect after Connelly | Best fit |
Cross-purchase | Surviving owners buy the shares directly, each holding policies on the others | Proceeds stay outside the company, no valuation bump | Two or three owners |
Entity redemption | The company buys back the shares using company-owned insurance | Proceeds count as a company asset, raising share value | Simple to administer, now tax-costly |
Hybrid or wait-and-see | Company has first option, owners have backup right, or the reverse | Depends on which path executes, needs drafting care | Owner groups that change over time |
Insurance LLC or partnership | A separate entity owns the policies and funds a cross-purchase | Proceeds stay outside the operating company | Four or more owners |
One-way | One party has the obligation, usually a key employee buying out a founder | Depends on ownership of the policy | Single-owner companies with a successor |
Valuation language matters more than the structure. A fixed price set in 2019 and never revisited is the single most common defect, followed closely by a formula tied to a multiple that no longer reflects the industry. Agreements that require a qualified appraisal as of the date of death age better, since they force a current number rather than preserving a stale one. Owners who have not looked at how their business would actually be valued are usually shocked at the spread between the agreement price and the market price.
Funding is the part that gets skipped. An agreement obligating surviving owners to buy a $6 million interest with no insurance and no cash creates a promise the company cannot keep, and the estate becomes an unwilling partner of the survivors.
Connelly Changed the Math on Company-Owned Life Insurance
In June 2024 the Supreme Court ruled unanimously in Connelly v. United States that life insurance proceeds received by a corporation to redeem a deceased shareholder’s stock are an asset of the company on the date of death, and that the obligation to redeem the shares does not offset them. Two brothers owned a building supply company. The company held $3.5 million of insurance on each. The estate valued the deceased brother’s shares at $3 million, the IRS said the insurance proceeds belonged in the company’s value, and the Court agreed.
The practical result is that a redemption-style buy-sell funded with company-owned insurance now inflates the value of the very shares it exists to buy. The estate reports a larger number, and in a taxable estate that larger number carries a 40% marginal rate.
Two responses matter for owners of taxable estates. Cross-purchase structures keep the proceeds out of the company entirely, which works cleanly with two or three owners and gets unwieldy past that, since each owner must hold a policy on every other owner. An insurance LLC or special-purpose partnership holds the policies for larger owner groups and funds a cross-purchase without the policy count exploding.
Owners well below the exemption face a smaller version of this problem. Connelly still raises the reported date-of-death value, which raises the audit surface and matters for state estate tax in the twelve states and D.C. with thresholds far below the federal number. Anyone with a redemption agreement drafted before June 2024 should have it read again.
Entity Type Decides What Breaks
S corporations carry the sharpest deadline. An estate is a permitted shareholder during administration, so the S election survives the death itself. The risk shows up when shares land in a trust that does not qualify, since an ineligible shareholder terminates the S election automatically and converts the company to a C corporation with corporate-level tax.
A testamentary trust or a former grantor trust may hold S corporation stock for two years after death. Holding past that window without a qualified Subchapter S trust or electing small business trust election ends the S election. The QSST or ESBT election itself runs on a much tighter clock, generally two months and 16 days after the stock transfers to the trust. Missing it is fixable through relief procedures, expensively and slowly.
LLCs default to the operating agreement, and most default badly. Absent contrary language, many state statutes pass only the economic interest to heirs, meaning distributions flow to the estate while management rights do not. Heirs end up holding a right to money with no voice in the company generating it, which is a reliable path to litigation among people who used to be family.
C corporations transfer most cleanly, since stock is stock and the entity is indifferent to who holds it. Partnerships fall in between, with the partnership agreement controlling whether the interest converts to an assignee interest or the partnership dissolves outright. Founders who have worked through an asset purchase versus equity purchase analysis already understand why entity form drives everything downstream.
Where the Cash Comes From When Tax Is Actually Due
The estate owes federal tax nine months after death, in cash, on an asset nobody can sell quickly. Section 6166 exists for exactly this. If the closely held business interest exceeds 35% of the adjusted gross estate, the executor can elect to spread the tax attributable to that business over as long as 14 years, structured as five years of interest-only payments followed by ten annual installments, with a subsidized 2% rate on the first slice of deferred tax.
Section 303 solves a related problem. It lets the corporation redeem enough stock to cover federal and state death taxes plus funeral and administration expenses, with capital gain treatment rather than dividend treatment, provided the stock exceeds 35% of the adjusted gross estate. Interests in multiple corporations can be aggregated when the estate holds at least 20% of each. Since the shares carry a stepped-up basis, a redemption at fair market value typically produces little or no taxable gain.
Estates that miss the 35% threshold sometimes borrow instead, using a Graegin loan from a third party where the interest is deductible as an administration expense. That structure invites scrutiny and requires real economic substance.
One piece of good news runs the other way. The equity itself takes a stepped-up basis to date-of-death fair market value under Section 1014, so heirs who sell the company shortly after death often owe little capital gains tax on decades of appreciation. Deferred compensation, receivables of a cash-basis business, and retirement accounts are treated as income in respect of a decedent and get no step-up at all, which is where the surprise income tax usually hides.
Valuation Is the Fight
Date-of-death fair market value is a number someone has to defend, and after Connelly the IRS has both a reason and a roadmap to challenge it. Revenue Ruling 59-60 still governs the analysis, weighing earnings history, book value, industry conditions, comparable sales, and the company’s dividend-paying capacity.
Executors should commission a qualified independent appraisal rather than relying on a buy-sell formula, since the Court in Connelly declined to treat the agreement price as controlling. Discounts for lack of control and lack of marketability remain available for minority interests and are worth real money, though they require support rather than assertion.
The alternate valuation date under Section 2032 gives estates a second option, measuring assets six months after death instead. It is available only when a Form 706 is required and only when it reduces both the gross estate and the estate tax, which makes it useful in a falling market and unavailable in a rising one. Owners who understand which earnings adjustments a buyer will actually accept tend to get to a defensible number faster, since appraisers and buyers argue about the same add-backs.
What Happens if the Owner Dies Mid-Deal
Deals in progress rarely survive intact. Purchase agreements carry material adverse change clauses, and the death of an owner in an owner-dependent business is close to a textbook trigger. Buyers who stay at the table almost always reprice.
Consideration structures built on the seller’s continued participation collapse first. An earn-out tied to post-close performance loses the person whose relationships drove that performance, and seller notes become an obligation to an estate rather than to a counterparty who cares about the company’s survival. Financing has its own tripwires, since SBA lenders treat a change of ownership as a new credit decision and most loan agreements include key-person and change-of-control covenants.
Owner dependency is the root exposure, and it is measurable before anything happens. Customer concentration tied to the owner’s relationships, undocumented processes, and a management team that has never operated without the founder all show up in the price. This is a large part of why bigger companies sell more easily than smaller ones, since scale usually forces the systems that reduce dependency.
The Checklist Worth Building This Quarter
None of this requires a full estate plan to start. It requires a folder that someone other than you can find.
- Read your buy-sell agreement, specifically the valuation clause and the funding mechanism, and confirm both still reflect the company’s current size.
- Confirm the structure is a cross-purchase or an insurance LLC rather than a company-owned redemption, or accept the Connelly consequence knowingly.
- Name a successor manager in the operating agreement and add a second person to the bank signature card.
- Verify that any trust holding S corporation stock qualifies as a QSST or ESBT, and calendar the election deadline if a transfer is coming.
- Get a current valuation, even an informal one, so the estate is not starting from zero.
- Carry key-person coverage separate from any buy-sell funding, sized to operating continuity rather than equity purchase.
- Write down who to call, where the documents live, and what the passwords are. The most expensive failures are administrative.
The estate tax exemption at $15 million is the least urgent part of this. What matters is that a closely held business is the one asset that can lose most of its value in the 90 days after the owner dies, and almost all of that loss is preventable with documents you can update this quarter. Pull the buy-sell agreement out of the drawer, read the valuation clause, and find out whether it describes the company you have now or the one you had when you signed it.
This article is for educational purposes and is not tax, legal, or investment advice. Figures and tax provisions verified as of August 1, 2026. Consult a CPA and an attorney licensed in your state.