Why It Matters
You sell a rental property with $291,600 in long-term capital gains. Pay it all this year and you're handing the IRS a big check in April while you've only received a down payment. Elect installment sale treatment and you recognize gain as principal payments arrive — spreading the tax hit over years, keeping yourself out of higher brackets, and matching your tax payments to actual cash in hand. The catch everyone misses: depreciation recapture is not deferrable. Every dollar of Section 1250 recapture hits in Year 1, no matter how small your down payment is. Know that number before you structure the deal — it shapes your entire Year 1 cash flow picture.
At a Glance
- Core rule: At least one payment must arrive after the tax year of sale to qualify
- Formula: GPP = (Selling Price − Adjusted Basis − Selling Costs) ÷ Selling Price; taxable gain per year = GPP × principal received
- Depreciation recapture: Fully taxable in Year 1 at 25% — never spreads across installments
- Election: Installment treatment is the default; you can elect OUT to recognize all gain in Year 1
- Reporting: File IRS Form 6252 every year you receive installment payments
- Disqualified assets: Inventory, publicly traded securities, and dealer dispositions cannot use this method
Gross Profit Percentage = (Selling Price − Adjusted Basis − Selling Costs) / Selling Price × 100%
How It Works
This is a tax timing tool, not a tax elimination strategy. Under IRC §453, you recognize taxable gain in proportion to the principal payments you receive each year — not all at once at closing. The key number is the Gross Profit Percentage (GPP). Apply it to every principal payment and you know exactly how much taxable gain to report that year. The tax is still coming; you're just controlling when.
The GPP formula uses your adjusted basis as the starting point. Gross Profit = Selling Price minus your adjusted basis minus qualified selling costs. Divide that by the selling price and you have your GPP percentage. Every principal payment you receive gets multiplied by that percentage to produce your taxable gain for the year. If you received $128,000 as a down payment and your GPP is 64.78%, you recognize $82,918 in gain that year — not the full $128,000.
Depreciation recapture breaks the spreading rule. This is the number that trips up every investor who thinks they can defer everything. The IRS requires all Section 1250 depreciation recapture to be reported in the year of sale — regardless of how little cash you received. If you've taken $123,000 in depreciation, you owe tax on $123,000 at the 25% recapture rate in Year 1, full stop. The remaining gain after stripping out recapture is what actually spreads over the installment period. Calculate your recapture before you negotiate deal terms.
You become a lender for the life of the note. The IRS requires a minimum interest rate on seller-financed notes — the Applicable Federal Rate (AFR), which changes monthly. If your promissory note charges below the AFR, the IRS will impute interest, reclassify some of what looks like principal as interest income, and tax it as ordinary income. Interest payments are always taxable in full the year received — they never run through the GPP calculation. Only principal gets the favorable installment treatment.
Disposing of the note accelerates everything. If you sell the installment note at a discount or gift it — including to family — the remaining deferred gain triggers immediately. You can't escape the deferred tax by transferring the note. And if the buyer defaults, you enter repossession territory, which has its own IRS calculation. This is an ongoing commitment, not a one-time election.
File IRS Form 6252 every year you receive payments. The form calculates the taxable gain portion, separates interest from principal, and outputs the final number to your capital gains schedule. You file it in the year of sale and every year after until the note is paid off or disposed of. This is not a one-time filing — it's an annual obligation for the life of the note.
The income from installment payments is passive income — and it flows through Schedule E. Each year you receive payments, file IRS Form 6252 alongside your return. The form calculates the GPP-based taxable gain, separates interest from principal, and feeds the output to your capital gains schedule. And know which gains qualify before you structure the deal: installment treatment only benefits long-term capital gain. Any short-term capital gains — gain from property held under a year, or gain treated as ordinary income — is taxable at full rates regardless of when payments arrive. Compare this to the step-up in basis your heirs get if you hold the property until death instead — which wipes out the deferred gain entirely. For older investors, that trade-off is worth running through with an estate attorney.
Real-World Example
Robert sold a rental property he'd owned for 12 years. Selling price: $640,000. His adjusted basis was $187,000 — original purchase price of $310,000 minus $123,000 in accumulated depreciation. Selling costs: $38,400 (6% commission).
Gross Profit: $640,000 − $187,000 − $38,400 = $414,600
GPP: $414,600 ÷ $640,000 = 64.78%
Depreciation recapture: Robert's $123,000 of accumulated depreciation is fully taxable in Year 1 at the 25% recapture rate. That's $30,750 in federal tax due no matter what. The remaining long-term gain eligible for installment spreading: $414,600 − $123,000 = $291,600.
Robert structured 20% down ($128,000) with the balance over 10 years at 6% interest.
Year 1 — received $128,000 down payment:
- Installment gain: $128,000 × 64.78% = $82,918
- Depreciation recapture: $123,000
- Total Year 1 taxable income from sale: $205,918
- Recapture tax at 25%: $30,750
- Long-term capital gains tax at 20% + 3.8% NIIT on $82,918: ~$19,900
- Year 1 federal tax from this sale: ~$50,650
Years 2–10 — ~$51,200 principal per year:
- Annual installment gain: $51,200 × 64.78% = $33,167 per year
- Plus interest income each year at ordinary rates (declines as balance amortizes)
Compare to selling without installment treatment: All $414,600 in gain hits in Year 1. At 20% + 3.8% NIIT on $291,600 in LTCG plus 25% on $123,000 recapture: that's roughly $99,600 in federal tax in a single year. Robert's installment approach cuts Year 1 tax nearly in half and spreads the remaining $291,600 of gain over a decade. Sound familiar? This is why long-time landlords choose installment sales over a straight cash-out.
What's the real risk? If the buyer stops paying in Year 4, Robert faces a repossession calculation and the deferred gain may accelerate. Buyer quality matters as much as the tax math.
Pros & Cons
- Spreads capital gains tax across multiple years — each year's taxable amount lands in a lower bracket than a single lump sum
- Creates a steady income stream from the seller-financed note with contractual, predictable payments
- Widens the buyer pool by offering seller financing to buyers who can't fully qualify for conventional bank loans
- Allows you to set the interest rate on the seller note (must meet or exceed the AFR minimum) — predictable interest income for years
- Installment treatment is the default — you actively choose to opt OUT if you want all gain recognized in Year 1
- Depreciation recapture is never deferrable — all Section 1250 recapture hits in Year 1, no matter how small the down payment
- You become the lender: buyer default risk, repossession complexity, and annual Form 6252 filing for the life of the note
- Selling or gifting the installment note triggers the full remaining deferred gain immediately
- Interest income is taxable as ordinary income in the year received — not at the favorable capital gains rate
- The strategy requires multi-year tax planning; without a CPA who understands IRC §453, investors miscalculate recapture or GPP and underpay
Watch Out
Depreciation recapture cannot be deferred. This catches investors who structure an installment sale expecting to spread their entire gain. If you've accumulated $123,000 in depreciation on a long-held property, that entire $123,000 is taxable at 25% in Year 1 — whether you received $30,000 down or $500,000 down. Run the recapture number before you negotiate deal terms. It changes your Year 1 obligations completely.
The AFR floor on interest is non-negotiable. Structure a seller note below the IRS Applicable Federal Rate and the IRS reclassifies part of your principal payments as imputed interest — turning installment gain (potentially 20% LTCG) into ordinary income (up to 37%). Check the current AFR before you draft the promissory note. It changes monthly.
Disposing of the note triggers immediate gain recognition. You can't sell or gift the installment note to escape the deferred tax. The moment that note changes hands — sale, gift, or contribution to an entity — the full remaining deferred gain is recognized as if you'd received all the payments at once. Investors who try to "clean up" a note this way face an accelerated tax bill with no cash to cover it.
Compare to step-up in basis before deciding. If you're older or in poor health, holding the property until death gives your heirs a stepped-up basis that eliminates all accumulated depreciation and all deferred gain — permanently. An installment sale that defers gain for 10 years versus holding until death and passing it with zero income tax is a real trade-off. The installment note does NOT get a step-up; your heirs still owe tax on payments they receive. Run both scenarios.
Watch the estate-tax and gift-tax implications. If you die holding the note, it's included in your taxable estate at face value. If you try to give it away before death, gift tax rules apply — and neither move eliminates the income tax on the deferred gain. It just determines who writes the check and when.
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The Takeaway
An installment sale is one of the most powerful tax timing tools in real estate, but it's not magic. You spread the capital gain across future years by applying the Gross Profit Percentage to each principal payment — staying in lower brackets year after year instead of absorbing a six-figure tax hit at once. But depreciation recapture is locked into Year 1, interest income is ordinary, and you carry real lender risk for the life of the note. Before you sign a seller-financed deal, know your adjusted basis, calculate your GPP, isolate the recapture amount, and project your tax for each payment year. Done right, an installment sale turns a sale into a multi-year income stream with a manageable tax cost. Done without planning, it turns a tax deferral into a surprise bill.