To report the sale of a business on your tax return, you split the transaction across several IRS forms based on what you actually sold. An equity sale generally lands on Form 8949 and Schedule D. An asset sale spreads across Form 4797 for depreciable property, Form 8949 and Schedule D for goodwill and other capital intangibles, and the ordinary-income line of your business return for inventory. Both sides also file Form 8594 to document the purchase price allocation, and any deferred payments trigger Form 6252. The character of each piece of the gain, ordinary or capital, drives which form it goes on and what rate it pays.
Start With Equity Sale or Asset Sale
The single most important question is whether you sold ownership interests or the underlying assets. That fork changes the forms, the character of the gain, and the rate.
A stock sale of a C corporation or S corporation goes on Form 8949, Sales and Other Dispositions of Capital Assets. Enter the acquisition date, sale date, proceeds, and adjusted basis. The gain or loss flows to Schedule D, which aggregates all your capital transactions for the year, and the net figure moves to Form 1040 for individuals or Form 1120-S for an S corporation.
Basis is where equity sellers most often go wrong. For S corporation stock or a partnership interest, your basis shifts every year with passed-through income, losses, and distributions. You need an accurate basis calculation carried through to the closing date, not the number you had when you first bought in.
A partnership interest sale follows the same Form 8949 path for the capital portion, but Section 751 requires you to carve out the slice of your gain attributable to the partnership’s inventory and unrealized receivables (the “hot assets”) and report it as ordinary income on Form 4797, Sales of Business Property.1Office of the Law Revision Counsel. 26 USC 751 – Unrealized Receivables and Inventory Items Sellers routinely underreport by treating the entire proceeds as capital gain and skipping the hot-assets calculation.
A sole proprietorship cannot be sold as a single unit. The IRS treats it as a collection of individual assets, so each item transferred gets its own gain or loss calculation, and each item follows the asset-sale rules below.
Allocating the Purchase Price on Form 8594
When a business changes hands through an asset sale, the total purchase price must be divided among the individual assets transferred. Both buyer and seller document this allocation on Form 8594, Asset Acquisition Statement Under Section 1060, and file it with their respective returns.2Internal Revenue Service. Instructions for Form 8594 The allocation is binding on both parties once they agree in writing, and the IRS expects the numbers on the two filings to match. A mismatch is a reliable audit trigger.
The residual method fills the most easily valued classes first and pushes whatever is left into goodwill:
- Class I: Cash and bank deposits, at face value.
- Class II: Actively traded securities and certificates of deposit.
- Class III: Accounts receivable, notes, and other debt instruments.
- Class IV: Inventory and property held for sale to customers.
- Class V: All other tangible assets, including equipment, vehicles, buildings, and land.
- Class VI: Intangible assets other than goodwill, such as patents, customer lists, and noncompete agreements.
- Class VII: Goodwill and going concern value (the residual).
The allocation determines the character of your gain. Class IV inventory produces ordinary income at your marginal rate. Class V depreciable property splits: gain equal to depreciation you previously deducted is recaptured as ordinary income under Section 1245, and any gain beyond that amount is Section 1231 gain. Net Section 1231 gains are treated as long-term capital gains, but if you claimed net Section 1231 losses in any of the prior five tax years, your current-year Section 1231 gain is recharacterized as ordinary income up to the amount of those prior losses.
Real property in Class V follows Section 1250 rather than 1245. Depreciation on buildings is recaptured at a maximum rate of 25% on the unrecaptured portion, which sits between the ordinary rate and the standard long-term capital gains rate. Class VI and Class VII allocations generally produce long-term capital gain if the assets were held more than a year.
Buyers push for higher allocations to Classes V and VI because those assets generate depreciation and amortization deductions. Sellers prefer higher allocations to Classes VI and VII because those produce capital gain. That tension is why the allocation agreement matters, and why the number you sign off on at closing effectively locks in your tax result.
Which Form Each Piece of the Asset Sale Goes On
Asset sales spread across multiple forms because different classes produce different types of income:
- Depreciable property (Class V) is reported on Form 4797. Depreciation recapture is calculated in Part III and reported as ordinary income in Part II. Any Section 1231 gain beyond the recapture amount goes to Part I.3Internal Revenue Service. 2025 Instructions for Form 4797 – Sales of Business Property
- Goodwill and capital-type intangibles (Classes VI and VII) go on Form 8949 and flow to Schedule D as long-term capital gains.4Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
- Inventory (Class IV) is reported as ordinary business income on the appropriate return, such as Schedule C for a sole proprietor. Inventory never touches the capital gain forms.
You must also attach the completed Form 8594 to your return. An individual seller attaches it to Form 1040; a corporate seller attaches it to Form 1120 or Form 1120-S. Failing to file Form 8594 exposes you to information-reporting penalties under Sections 6721 through 6724 and gives the IRS grounds to challenge your entire allocation.
Before any of this moves to a form, you need the underlying math. Your amount realized includes all cash received, the fair market value of any property the buyer gave you, and the balance of any debts the buyer assumed on your behalf. If the buyer takes over a $200,000 business loan, that counts as $200,000 in additional proceeds. Subtract your direct selling costs: brokerage commissions, legal fees, accounting fees, and appraisal expenses. Adjusted basis for each asset is original cost plus capital improvements, minus any depreciation or amortization previously claimed.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses
The Section 338 Election
One structural point worth flagging for C corporation stock deals: the buyer can elect under Section 338 to treat the stock purchase as a deemed asset sale.6Office of the Law Revision Counsel. 26 USC 338 – Certain Stock Purchases Treated as Asset Acquisitions That gives the buyer a stepped-up basis in the underlying assets but triggers an immediate corporate-level tax, which is why buyers usually pay a premium to make it work.
Installment Sales, Earnouts, and Form 6252
When the sale agreement calls for at least one payment after the end of the tax year in which the sale closes, you can report the gain under the installment method on Form 6252, Installment Sale Income.7Internal Revenue Service. About Form 6252, Installment Sale Income Instead of recognizing the full gain in the year of closing, you spread it across the years you actually receive payments.
You calculate a gross profit percentage by dividing the total gain by the total contract price, and that percentage is locked in for the life of the deal. Each year you multiply it by the principal payments received to determine recognized gain. On a $600,000 gain and a $1,000,000 contract price, the percentage is 60%; a $200,000 payment in year two produces $120,000 of recognized gain that year. The gain flows from Form 6252 to either Form 4797 or Schedule D, keeping whatever character the initial allocation gave it.
Depreciation recapture cannot be deferred. Under Section 453(i), all recapture income must be recognized in the year of sale regardless of when the cash comes in. You still complete Form 8594 and the full gain calculation in the year of sale.
Two other traps affect larger or seller-financed deals. If the total face amount of your installment obligations from non-farm, non-personal-use property exceeds $5,000,000 in any tax year, Section 453A imposes an interest charge on the deferred tax liability at the IRS underpayment rate. Model this before agreeing to installment terms above the threshold, because the charge eats much of the time-value benefit of deferral. If you carry a note for the buyer and the interest rate is missing or below the IRS test rate tied to applicable federal rates, Section 483 recharacterizes part of each payment as ordinary interest income to you rather than sale proceeds. Any note with payments due more than a year out should specify an adequate stated rate.
Earnouts (contingent payments tied to future business performance) also use Form 6252, under the contingent-payment rules in Temporary Regulation Section 15A.453-1. The bigger risk with an earnout is characterization: if the payments are tied to your continued employment or services for the buyer, the IRS can recast them as compensation rather than purchase price, converting capital gain into ordinary income subject to payroll taxes. Arm’s-length post-closing compensation for the seller and no requirement that the seller stay employed for the earnout to pay out both favor capital gain treatment.
Claiming the Section 1202 Exclusion
If you held C corporation stock for at least five years and the corporation met the qualified small business requirements when it issued the stock, Section 1202 lets you exclude up to 100% of the gain from federal income tax. The excluded amount is capped at the greater of $10 million per issuer (reduced by exclusions claimed in prior years) or ten times your adjusted basis in the stock sold.
To qualify, the corporation must have been a domestic C corporation with aggregate gross assets of no more than $75 million at and immediately after the stock issuance. During substantially all of your holding period, at least 80% of the corporation’s assets by value must have been used in a qualified trade or business. Several service industries are excluded, including healthcare, law, accounting, consulting, financial services, and engineering.
On your return, report the sale on Form 8949 as you normally would, then enter the excluded gain as a negative number in column (g) using adjustment Code Q. That reduces the gain that flows to Schedule D. If the stock was sold on an installment basis, the Schedule D instructions contain separate guidance for applying the exclusion to installment payments.
Estimated Tax Payments and the 3.8% Surtax
A large business sale gain can create a tax bill that ordinary withholding will not cover. To avoid an underpayment penalty, your total payments for 2026 must equal at least the smaller of 90% of your 2026 tax liability or 100% of your 2025 tax liability. If your 2025 adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor jumps to 110% of 2025 tax.
If the sale closes mid-year, you can use the annualized income installment method on Form 2210 to concentrate estimated tax payments in the quarters after closing, rather than spreading them evenly across all four quarters. That is the standard approach when a one-time event drives most of the year’s income.
Layered on top of income tax and capital gains tax is the 3.8% net investment income tax, which applies when your modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly). Those thresholds are not indexed for inflation. Whether the surtax hits your sale proceeds depends on your involvement in the business. If you materially participated, the gain generally is not net investment income and escapes the surtax. If you were a passive investor, the gain is net investment income and the 3.8% applies to the lesser of your net investment income or the excess of your modified AGI over the threshold.
Material participation most commonly means working more than 500 hours in the business during the tax year, with several alternative tests including participation for any five of the preceding ten tax years. Sellers who stepped back from active management in the years before closing sometimes lose the exemption without realizing it, which adds 3.8% to the effective rate on the entire gain.
How the Character Split Affects the Rate
The reason character matters is that rates diverge sharply. For 2026, long-term capital gains are taxed at 0% if taxable income stays below $49,450 (single) or $98,900 (married filing jointly), at 15% up to $545,500 (single) or $613,700 (joint), and at 20% above those thresholds. Ordinary income runs up to 37% for taxable income above $640,600 (single) or $768,700 (joint).
A pure equity sale typically produces a single long-term capital gain at the lower rates. An asset sale produces a mix: inventory at ordinary rates, depreciation recapture at ordinary rates (or 25% for real property under Section 1250), and goodwill at capital gains rates. The blended effective rate on an asset sale is almost always higher than on a stock sale, which is why sellers generally prefer equity deals and buyers prefer asset deals.
State income taxes add another layer. Most states tax capital gains at the same rates as ordinary income, with top rates ranging from 0% in states with no income tax to above 13% in the highest-tax states. When federal capital gains tax, the 3.8% net investment income tax, and state income tax are combined, the marginal rate on a business sale can exceed 37% even on gain that qualifies as long-term capital. Running the numbers before closing gives you time to negotiate structure and allocation that reduce the total tax due.