The sale of a business is, among other things, a tax event — often the largest single tax event in an entrepreneur’s life. Yet it is striking how many founders approach the sale of their business with only a vague understanding of how the resulting gain will be taxed and what, if anything, can be done to improve the tax outcome. The difference between a well-planned and a poorly planned exit can be measured in millions of dollars of after-tax proceeds, and there is very little that can be done to recover those dollars once the deal closes. This article provides an introduction to the principal tax concepts that every founder should understand before entering an M&A process. It is not a substitute for specific tax advice tailored to your situation, which you must obtain from qualified tax counsel before you make any binding commitments.
Capital Gains vs. Ordinary Income: The Fundamental Distinction
The most important tax concept in any business sale is the distinction between capital gain and ordinary income. Capital gain arises when you sell a capital asset — such as shares of stock or a partnership interest — for more than your tax basis in that asset. Ordinary income arises from wages, business profits, interest, and the sale of certain non-capital assets. The federal income tax rate applicable to long-term capital gain is significantly lower than the rate applicable to ordinary income, and this difference has enormous consequences for the after-tax outcome of a business sale.
As of 2024, the federal ordinary income tax rate reaches a maximum of 37 percent. The federal long-term capital gains rate, which applies to gains on assets held for more than one year, is 0 percent for lower-income taxpayers, 15 percent for middle-income taxpayers, and 20 percent for taxpayers whose income exceeds approximately $518,000 for married filers. High-income taxpayers are also subject to the 3.8 percent net investment income tax on capital gains under the Affordable Care Act, bringing the maximum federal rate on long-term capital gains to 23.8 percent. State income taxes apply on top of these federal rates and vary significantly by state — California’s top rate of 13.3 percent applies to capital gains as well as ordinary income, while states like Texas and Florida impose no state income tax at all.
The practical consequence of these rate differentials is substantial. A founder selling $10 million of long-term capital gain assets in a low-tax state pays a maximum federal rate of 23.8 percent, keeping approximately $7.62 million after federal tax. If that same $10 million were taxed as ordinary income, the founder would pay 37 percent federal tax, keeping approximately $6.3 million after federal tax. That is more than a $1.3 million difference in after-tax proceeds on a single transaction, purely from the characterization of the gain. This is why founders and their advisors spend significant effort structuring transactions to maximize capital gain treatment and minimize ordinary income.
Your Holding Period and Qualified Small Business Stock
Long-term capital gain treatment requires that you have held the asset being sold for more than one year. For founders who have owned their shares from the beginning of the company, the holding period question is simple: you have owned your shares for years. But for founders who received shares in connection with vesting schedules or option exercises, the holding period analysis can be more complicated. If you exercised stock options and immediately sell the resulting shares in connection with a business sale, your holding period in the shares may be measured from the date of exercise, not the date of the option grant. If you exercised the options and acquired the shares less than one year before the sale, the gain will be taxed as short-term capital gain at ordinary income rates.
One of the most powerful tax benefits available to some founders is the exclusion for Qualified Small Business Stock, or QSBS, under Section 1202 of the Internal Revenue Code. QSBS allows founders who meet certain requirements to exclude a significant portion of their capital gain — potentially up to $10 million or ten times their basis in the stock, whichever is greater — from federal income tax entirely. This is not a deferral; it is a permanent exclusion. On a $10 million gain that qualifies for the full QSBS exclusion, the federal tax saving can exceed $2 million.
To qualify for the QSBS exclusion, the stock must meet several requirements: it must be stock (not options or partnership interests) in a C corporation; the corporation must have had aggregate gross assets of $50 million or less at the time the stock was issued; the stock must have been acquired at original issuance (not purchased from another stockholder); the taxpayer must have held the stock for more than five years; and the corporation must have conducted an active qualified trade or business during substantially all of the holding period. Certain industries, including professional services, financial services, hospitality, and certain other sectors, do not qualify.
QSBS is a powerful benefit, but it requires advance planning. If your company converted from an LLC to a C corporation, the five-year holding period typically begins from the date of conversion, not the date of founding. If your company has previously been an S corporation or another pass-through entity, you may have limited QSBS eligibility. These nuances make early engagement with tax counsel essential for any founder whose company might qualify.
How Deal Structure Affects Your Tax Outcome
The structure of the deal — specifically, whether the transaction is structured as a stock sale or an asset sale — has a direct and significant impact on how the proceeds are taxed. In a stock sale, individual shareholders sell their shares and pay capital gains tax on the difference between the sale price and their basis in the shares. This is generally the most tax-efficient structure for the seller, because the entire gain is treated as capital gain (assuming the shares have been held for more than one year).
In an asset sale, the tax treatment depends on the type of asset being sold and, critically, on the type of entity that owns the assets. For a C corporation, an asset sale creates a double layer of tax: the corporation pays corporate income tax on the gain from selling the assets, and then the shareholders pay tax again when the after-tax proceeds are distributed to them as a dividend or in liquidation. The combined tax burden of a C corporation asset sale can easily approach or exceed fifty percent of the total gain, compared to approximately twenty-four percent (at maximum federal rates) for a stock sale by individual shareholders.
For pass-through entities — S corporations, partnerships, and LLCs taxed as partnerships — an asset sale is generally more tax-efficient because there is only one level of tax. The gain from the asset sale flows through the entity to the individual owners, who pay tax at their individual rates. However, the character of the gain (capital gain versus ordinary income) in an asset sale depends on the type of asset being sold, and some assets — including inventory, accounts receivable, and depreciation recapture — generate ordinary income rather than capital gain regardless of how long the business has operated.
Depreciation recapture is worth particular attention for sellers of businesses with significant fixed assets or real property. When depreciable assets are sold in an asset deal, the gain attributable to prior depreciation deductions is recaptured as ordinary income, not capital gain. This is referred to as Section 1245 recapture for personal property and Section 1250 recapture for real property. If your business has taken aggressive depreciation — including bonus depreciation under the Tax Cuts and Jobs Act — the recapture amount may be substantial.
Installment Sales and Seller Notes: Deferring Tax on Deferred Proceeds
In some transactions, you will receive all of the purchase price at closing. In others, part of the consideration will be deferred: in the form of a seller note (a loan you extend to the buyer, payable over time with interest), an earnout, or rollover equity in the acquiring company. The tax treatment of deferred consideration depends on its form.
When you receive payment over time — as in a seller note — you may be able to report the gain on the installment method under Section 453 of the Internal Revenue Code. Under the installment method, you recognize gain in proportion to the payments you receive in each tax year, rather than recognizing the entire gain in the year of sale. This can be advantageous if you are in a high-income year of sale and expect to be in a lower bracket in subsequent years. However, the installment method is not available for publicly traded stock or for gains that are characterized as ordinary income rather than capital gain.
Rollover equity — the practice of receiving equity in the buyer or a new holding company in exchange for a portion of your company’s equity — is a more complex situation from a tax perspective. If the rollover qualifies as a tax-free reorganization under the Internal Revenue Code, you can defer recognition of gain on the rolled-over portion until you eventually sell the acquiring entity’s equity. However, many rollover transactions do not qualify for tax-free treatment, and the structure must be carefully designed with tax counsel to achieve the desired tax result. Additionally, if the acquiring entity is a partnership or LLC taxed as a partnership, the gain on the rollover may be subject to ordinary income characterization in certain circumstances.
State and Local Tax Considerations
Federal income tax is only part of the picture. State income taxes can add significantly to your total tax burden depending on where you live and where your company is incorporated and operates. High-income-tax states like California, New York, New Jersey, Oregon, and Minnesota impose rates that can add ten to thirteen percentage points to your effective tax rate on capital gains. States that have no income tax — Texas, Florida, Nevada, Wyoming, South Dakota, Washington, and Alaska among them — impose no additional burden.
If you are a resident of a high-income-tax state but your company is incorporated in a different state, questions can arise about which state has the right to tax your gain. These issues — particularly for owners of companies that operate across multiple states — can be highly fact-specific and sometimes lead to competing tax claims from multiple states. Tax counsel with multistate experience is important in these situations.
Some founders who are contemplating a sale and live in high-tax states consider relocating to a low-tax or no-tax state before the transaction closes. This can be an effective strategy if done correctly and sufficiently in advance of the sale, but it carries real legal and personal requirements. Most high-tax states will challenge a claimed change of domicile if the taxpayer retains significant connections to the original state, and the rules for establishing a new domicile are rigorous. Attempting this strategy without qualified advice, or without genuinely changing your life situation, can result in disputed tax claims that cost more to resolve than they saved.
Why Talking to a Tax Advisor Before Signing Is Not Optional
The most common and costly mistake founders make in the tax area is waiting too long to engage tax counsel. Many of the most powerful tax planning strategies — QSBS, installment sales, reorganization treatment for rollovers, trust planning, charitable giving — require action before the transaction closes or even before the LOI is signed. Once the definitive purchase agreement is signed with a fixed structure and fixed terms, your options narrow dramatically.
A qualified tax advisor who specializes in M&A transactions can help you model the after-tax economics of different deal structures, identify whether specific strategies are available given your entity type and ownership history, coordinate with transaction counsel on deal structure to optimize tax outcomes, and plan for the deployment of sale proceeds in a tax-efficient manner. Charitable remainder trusts, donor-advised funds, qualified opportunity zone investments, and other post-sale planning tools can further reduce the tax burden, but all of them require advance planning.
The fee for skilled M&A tax advice is a small fraction of the after-tax benefit it can generate. In a transaction of any significant size, engaging tax counsel early — ideally before the banker has been hired and certainly before any LOI is signed — is among the highest-return investments available to a founder preparing to sell.