Selling Your Business on Installment: How a $2M Deal Paid Over 5 Years Cuts Your 2026 Tax Bill

How the installment method works: the gross profit percentage

Under IRC § 453, when you sell a business and receive at least one payment after the tax year of the sale, the IRS lets you report gain as you collect — not all at once. The math hinges on one number: the gross profit percentage.

Formula: Gross Profit Percentage = (Selling Price − Adjusted Basis) ÷ Contract Price

On a $2M asset sale with $400K of adjusted basis:

• Gain: $2,000,000 − $400,000 = $1,600,000
• Contract price: $2,000,000
• Gross profit percentage: $1,600,000 ÷ $2,000,000 = 80%

Every dollar of principal you receive is 80% gain and 20% return of basis. On a five-year note with $400K annual payments, each year you report $320,000 of gain and $80,000 of nontaxable basis recovery. You report this on Form 6252 (Installment Sale Income) each year you receive a payment.

Worked example: $2M sale, $400K/year over 5 years

Compare that to a lump-sum sale: $1.6M of gain in a single year pushes you into the 20% LTCG bracket (single filers above $533,400 in 2026) and triggers the 3.8% NIIT on every dollar above $200K (single) or $250K (MFJ) of MAGI. Lump-sum federal tax on $1.6M of LTCG: up to $380,800 (20% + 3.8% = 23.8% × $1.6M). Installment total at 15%: $240,000. Savings: roughly $140,000 in federal tax alone.

That $140K difference assumes the seller manages other income to keep each year’s total below the 20% LTCG bracket ($533,400 single, $600,050 MFJ in 2026) and below the NIIT threshold. If other income pushes MAGI above those thresholds, the savings narrow — but even partial bracket management yields five-figure savings.

The depreciation recapture trap: § 1245 hits in year one

Here’s where the math breaks for sellers who don’t plan ahead. Under IRC § 453(i), depreciation recapture is recognized in the year of sale regardless of when you receive payment. The installment method does not defer recapture.

In a typical small business asset sale, the purchase price is allocated across asset classes under IRC § 1060:

• Equipment, vehicles, fixtures (§ 1245 property): gain up to the amount of accumulated depreciation is taxed as ordinary income (up to 37% federal) in year one.
• Real property (§ 1250): recapture of depreciation in excess of straight-line is ordinary income in year one (though most post-1986 real property uses straight-line, so the § 1250 hit is usually limited to the 25% unrecaptured gain rate).
• Goodwill and intangibles: these qualify for installment treatment. No recapture issue.

Scenario: Austin HVAC business, $2M asset sale with $600K in equipment

An Austin-based commercial HVAC owner sells her business for $2M. Deal allocation: $600K to equipment (with $350K of accumulated § 1245 depreciation), $200K to receivables, $1.2M to goodwill. Buyer pays $400K/year over five years.

In year one, she owes ordinary income tax on $550,000 ($350K recapture + $200K receivables) even though her first installment payment is only $400,000. At the 32% bracket, that’s $176,000 of federal tax due in a year she received $400K in cash. The installment method defers the goodwill and remaining equipment gain — but the recapture creates a year-one cash crunch that most sellers don’t model.

The planning lever: negotiate a larger first-year payment (a “balloon” down payment) sized to cover the recapture tax bill. If the buyer pays $700K at closing and $325K/year for years 2–5, the seller has cash to cover the year-one recapture hit without dipping into savings.

Interest imputation: when your note rate is too low

If you carry a seller-financed note and charge interest below the Applicable Federal Rate (AFR) published monthly by the IRS under IRC § 1274, the IRS recharacterizes part of each principal payment as imputed interest. This means:

• For the seller: less capital gain, more ordinary income (interest income taxed at federal rates up to 37%).
• For the buyer: more interest expense (potentially deductible under § 163).

The AFR depends on the note term: short-term (0–3 years), mid-term (3–9 years), or long-term (9+ years). For a five-year installment note, the mid-term AFR applies. As of early 2026, mid-term AFR is roughly 4–5%.

Example: Your $2M note charges 2% interest. The mid-term AFR is 4.5%. The IRS treats the note as if it charged 4.5%, recharacterizing the 2.5% gap as additional interest income to you (ordinary income) and reducing your capital gain by the same amount. On a $1.6M outstanding balance, that’s roughly $40K/year reclassified from LTCG rates (15–20%) to ordinary rates (up to 37%).

The fix: charge at least the AFR. Check the rate at IRS.gov each month the note is written. A note at or above AFR avoids imputation entirely. Most sellers charge AFR + 1–2% as a risk premium anyway — the imputation rules are only a trap for family deals and below-market seller financing.

Buyer default: the gain you already reported doesn’t come back

The risk that keeps sellers up at night: you’ve been reporting gain on installment payments for three years, and in year four the buyer defaults. You repossess the business assets (or what’s left of them). Here’s the tax reality:

• Gain already reported is not reversed. The IRS does not let you un-recognize gain from prior years. You paid tax on $960K of gain (three years × $320K/year). That’s done.
• Repossession gain or loss: under general tax principles for personal property (IRC § 1038 applies specifically to real property), your gain on repossession equals the FMV of assets recovered minus your remaining basis in the installment obligation.
• Bad debt deduction: you may claim a bad debt deduction under IRC § 166 for the unpaid portion of the note, but only if you can demonstrate the debt is wholly or partially worthless.
• Asset condition risk: if the buyer ran the business into the ground, the repossessed assets may be worth far less than the remaining $800K on the note. You’re left with a bad debt deduction that offsets only some of the tax you already paid.

The protection lever: secure the installment note with a UCC-1 filing on business assets and personal guarantees. Include acceleration clauses and collateral maintenance covenants. An installment sale without security is an unsecured loan to the buyer — and you’ve already reported the gain on money you haven’t collected.

The § 453A interest charge: when deferred gain exceeds $5M

For most small business sales under $5M, this rule doesn’t apply. But it’s the trap door that makes installment sales less attractive at scale.

Under IRC § 453A, if two conditions are met, the IRS imposes an interest charge on the deferred tax liability:

1. The selling price exceeds $150,000, and
2. The total face amount of all your installment obligations outstanding at year-end exceeds $5,000,000.

The interest rate is the IRS underpayment rate (federal short-term rate + 3 percentage points). The charge applies to the tax you would owe if all deferred gain were recognized immediately. It’s essentially the government charging you for the privilege of deferral.

Example: A seller carries a $7M installment note with $5.6M of deferred gain. At the 20% LTCG rate, the deferred tax is $1.12M. At a § 453A interest rate of ~8% (short-term AFR + 3%), the annual interest charge is roughly $89,600. That’s $89,600/year paid to the IRS just for the right to defer — it does not reduce the underlying tax bill.

When the charge wipes out the benefit: on a $7M sale, the § 453A interest charge can consume the entire bracket-arbitrage savings of installment reporting within 2–3 years. At that scale, most sellers are better off taking the gain in one year, paying the 23.8% rate (20% LTCG + 3.8% NIIT), and deploying the after-tax proceeds immediately.

What qualifies for installment treatment — and what doesn’t

Not every component of a business sale can be deferred:

In a typical small business asset sale, 40–70% of the purchase price is goodwill — the component most favorable for installment treatment. The rest is a mix of equipment (partially deferred, recapture in year one), receivables (not deferred), and inventory (not deferred). The earn-out structure adds another layer: contingent payments based on post-sale performance may qualify for installment treatment under the open-transaction doctrine, but the rules are narrower and the IRS scrutinizes these closely.

When to elect OUT of the installment method

The installment method is the default for qualifying sales — you don’t elect into it; you elect out by reporting the full gain on your return for the year of sale. Reasons to elect out:

• You’re already in a low bracket. If you’re in the 0% LTCG bracket (MFJ taxable income under $96,700 in 2026) and the gain won’t push you above 15%, there’s no bracket arbitrage to capture. Take the gain now.
• Tax rates are going up. If you believe LTCG rates will increase in future years (legislative risk), recognizing the gain now at known rates may be smarter than deferring into uncertainty.
• You have capital losses to offset. If you have $500K in capital loss carryforwards, recognizing $1.6M of gain now lets you offset $500K immediately. The installment method spreads the gain, and your losses may expire unused.
• The § 453A interest charge applies. On sales above $5M, the interest charge can exceed the bracket-arbitrage benefit.
• You want to reinvest immediately. A lump-sum sale gives you full proceeds to redeploy. If the after-tax reinvestment return exceeds the deferral benefit, take the money.

The election out is made on a timely filed return (including extensions) for the year of sale. Once you elect out, you cannot revoke it without IRS consent.

Form 6252: how to report installment income each year

You file Form 6252 (Installment Sale Income) in the year of sale and in every subsequent year you receive a payment. The form walks through:

1. Selling price, adjusted basis, and gross profit percentage (computed once in year one)
2. Payments received during the year (principal only — interest goes on Schedule B)
3. Installment sale income: payment × gross profit percentage
4. The result flows to Schedule D (for capital gain) or Form 4797 (for § 1231 / ordinary gain)

Interest received on the note is reported separately on Schedule B as ordinary interest income. This is taxed at your marginal ordinary rate (up to 37% federal in 2026), not LTCG rates. The interest portion is often overlooked when modeling the installment sale benefit — sellers focus on the LTCG deferral and forget they’re picking up ordinary income on the interest stream.

The bottom line: when installment sales save real money

The installment method saves the most money when three conditions align: (1) the total gain would push you above the 15% LTCG bracket or into NIIT territory in a lump-sum year, (2) the depreciation recapture component is small relative to the goodwill, and (3) the total deferred obligation stays below $5M to avoid the § 453A interest charge. On a $2M small business sale with $400K of basis and a goodwill-heavy allocation, the math works: $140K in federal tax savings over five years, with manageable year-one recapture if you structure the payment schedule around the cash-flow gap. Above $5M, model the § 453A charge before committing. And secure the note — because the gain you’ve already reported doesn’t come back if the buyer stops paying.