An installment sale under Section 453 of the Internal Revenue Code is any sale of property in which the seller receives at least one payment after the tax year of the sale. Instead of paying tax on the entire gain at closing, the seller reports gain in proportion to the payments received each year, using a fixed gross profit percentage, and the deferral applies automatically unless the seller elects out. The limits matter as much as the benefit: depreciation recapture is taxed in full in the year of sale, publicly traded stock never qualifies, and deferred obligations above $5 million can trigger an annual interest charge.
How the installment method spreads gain across years
The framework comes from Section 453, IRS Publication 537, and Form 6252. Gross profit is the selling price minus the adjusted basis of what was sold. The contract price is the selling price adjusted for certain debts the buyer assumes. Dividing gross profit by contract price produces the gross profit percentage, and that percentage of every principal payment is taxable gain in the year the payment arrives. The remainder of each payment is a tax-free return of basis. Stated interest on the deferred balance is separate: it is ordinary income, taxed as received.
A round-number example. An owner sells business assets for $10 million against a $4 million adjusted basis. The buyer pays $6 million at closing and signs a $4 million note paying $1 million of principal a year for four years, plus interest. Gross profit is $6 million and the gross profit percentage is 60 percent. The seller reports $3.6 million of gain in the closing year, then $600,000 of gain in each of the four note years. The interest coupons are taxed separately as ordinary income. The total gain is identical either way; only the timing changes.
Reporting runs through Form 6252, filed for the year of sale and for every later year in which a payment is received. Two boundaries are easy to miss. Deferral changes timing, not rates: gain reported in a later year is taxed at whatever rates apply in that year. And losses never qualify. A sale at a loss is reported in the year of sale no matter when the cash arrives.
What does not qualify for installment treatment
Several categories of gain are carved out entirely, and two of them show up constantly in private company deals.
| Item | Treatment |
|---|---|
| Stock or securities traded on an established market | Entire gain reported in the year of sale; no installment method |
| Depreciation recapture (Sections 1245/1250) | Ordinary income in the year of sale, even if no payment is received that year |
| Inventory of personal property | Not eligible, regardless of payment schedule |
| Dealer sales (property regularly sold on installment plans) | Not eligible |
| Sales at a loss | Loss reported in the year of sale |
| Depreciable property sold to a related party | Generally, all payments treated as received in the year of sale |
Depreciation recapture deserves the closest look. In a typical asset sale of an equipment-heavy business, much of the machinery has been fully depreciated, so a slice of the price is recapture taxed as ordinary income at closing. That tax is due in year one even if nearly all of the cash is deferred, which can leave a seller writing a check before the note has paid anything. One partial offset: the recapture recognized in the year of sale is added to basis when computing the gross profit percentage on the remaining payments, so it is not taxed twice.
Related-party rules add a second trap. A sale of depreciable property to a related person generally cannot use the installment method at all. And when a related buyer resells the property within two years, before the original seller has collected all payments, the resale proceeds are treated as received by the original seller, accelerating the deferred gain.
Electing out of the installment method
Installment reporting is the default, not a choice a seller opts into. A seller who prefers to recognize the entire gain in the year of sale elects out by reporting the full gain on Form 8949 or Form 4797 rather than Form 6252, on a return filed by the due date including extensions. A seller who misses that window has limited relief: an amended return within six months of the original due date, marked as filed under regulation section 301.9100-2. Once made, the election can be revoked only with IRS approval.
Why would anyone accelerate tax? Situations advisors commonly model include expiring capital losses that could absorb the gain, an expectation that rates will be higher in the payout years, and avoiding the Section 453A interest charge described below. Whether any of that outweighs the value of deferral is a fact-specific calculation for the seller's own tax advisors, not a general rule.
One wrinkle when the price is contingent: a seller who elects out of a deal with an earnout must report the fair market value of the contingent obligation in the year of sale, and under the regulations that value can never be less than the fair market value of the property sold minus the other consideration received. Electing out of a contingent deal can therefore mean paying tax up front on value the earnout may never deliver.
The interest charge on large deferred balances (Section 453A)
Above a threshold, deferral is no longer free. Section 453A applies to installment obligations from sales of property with a sales price over $150,000, with exceptions for personal-use property and farm property. When the face amount of such obligations arising during a tax year and still outstanding at year end exceeds $5 million, the seller owes an annual interest charge on a portion of the deferred tax. These figures are statutory, not inflation-indexed, and reflect the law in effect as of 2026.
The computation works in three steps. The deferred tax liability is the unrecognized gain multiplied by the maximum tax rate that would apply to it. An applicable percentage is the portion of the outstanding face amount above $5 million divided by the total outstanding face amount. Interest equals the deferred tax liability times that percentage times the IRS underpayment rate under Section 6621. The charge repeats every year the balance stays above the threshold and adds to the tax bill dollar for dollar.
Two details matter for owners of pass-through companies. The $5 million test applies per taxpayer, measured at the partner or S corporation shareholder level, and married individuals are not treated as a single taxpayer for the threshold. Separately, a pledge rule blocks the obvious workaround: for sales over $150,000, borrowing against the installment note causes the net loan proceeds to be treated as a payment received. A seller cannot monetize the note with a loan and keep the deferral intact.
How seller notes and earnouts interact with Section 453
Seller notes
A seller note is the classic installment obligation. Principal payments are taxed under the gross profit percentage; stated interest is ordinary income. The note must carry adequate stated interest, tested against the IRS applicable federal rates. If it does not, part of the principal is recharacterized as unstated interest, converting what would have been capital gain into ordinary interest income. The deferral also rides on the buyer's ability to pay: tax follows cash, which is the appeal, but a note that goes bad carries its own set of tax consequences, which CPAs commonly model as part of deal planning.
Earnouts as contingent payment sales
An earnout usually makes the transaction a contingent payment sale, because the total selling price cannot be determined by the close of the year of sale. The Treasury regulations sort these deals into three tracks. When the agreement states a maximum selling price, that cap is treated as the selling price for computing the gross profit ratio; if the earnout ultimately pays less than the cap, the ratio is recomputed for the affected years. When there is no cap but payments run over a fixed period, basis is allocated in equal annual increments across that period. When there is neither a cap nor a fixed period, basis is recovered ratably over 15 years, and the IRS scrutinizes whether the arrangement is truly a sale rather than a license or royalty stream.
The practical effect of the capped-earnout rule surprises sellers. Because the gross profit ratio assumes the maximum will be paid, early payments carry more taxable gain and less basis recovery than the eventual economics may justify, with the correction arriving only when the earnout resolves. Deal lawyers and CPAs often model the earnout's tax profile alongside its commercial terms for exactly this reason.
Where advisors fit
Installment reporting decisions are made deal by deal and documented before closing. A CPA models the year-one cash tax (recapture plus tax on closing proceeds), the Section 453A exposure on large notes, and the elect-out alternative. A deal attorney papers the note terms, interest rate, security, and earnout definitions that drive the tax answer. A wealth advisor plans liquidity so taxes due in year one do not force a sale of other assets. Platforms such as Bankerly.ai manage the sale process itself; the reporting choices described here belong with the owner's own tax professionals.
This article is educational only. It is not tax, legal, or investment advice, and it does not recommend any structure, election, or strategy. Figures reflect federal law in effect as of 2026 and may change; state treatment varies. Owners should consult their own qualified tax, legal, and financial advisors about their specific situation.
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Frequently asked questions
- How does an installment sale defer capital gains tax?
- When a seller receives at least one payment after the year of sale, Section 453 spreads the gain across the years payments arrive. A gross profit percentage (gross profit divided by contract price) is applied to each principal payment to determine the taxable slice; the rest is basis recovery. Interest on the deferred balance is taxed separately as ordinary income. Reporting is done on Form 6252 each year.
- Does depreciation recapture qualify for installment sale treatment?
- No. Recapture under Sections 1245 and 1250 is reported as ordinary income in the year of sale, even if the seller receives no payment that year. This can create a year-one tax bill on a mostly deferred deal. The recapture recognized at closing is then added to basis when computing the gross profit percentage on the remaining installment payments, so that amount is not taxed again.
- How do you elect out of the installment method?
- Installment reporting is automatic, so a seller opts out by reporting the entire gain on Form 8949 or Form 4797 instead of Form 6252, on a return filed by the due date including extensions. Limited relief allows an amended return within six months of the original due date under regulation section 301.9100-2. Once made, the election can be revoked only with IRS approval.
- What is the Section 453A interest charge on installment sales?
- For sales over $150,000, when a taxpayer's installment obligations arising in a year and outstanding at year end exceed $5 million in face amount, an annual interest charge applies to part of the deferred tax. It equals the deferred tax liability times the portion of the balance above $5 million times the IRS underpayment rate, and it recurs each year the balance stays above the threshold.
- How is an earnout taxed to the seller of a business?
- An earnout typically makes the deal a contingent payment sale under the installment rules. With a stated maximum price, the cap is used to compute the gross profit ratio, recomputed if the earnout pays less. With a fixed period and no cap, basis is spread in equal annual increments. With neither, basis is recovered over 15 years. Electing out instead requires reporting the obligation's fair market value up front.
Considering a sale in the next few years? See what a prepared process looks like.
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