Form 6252

Form 6252: How to Report an Installment Sale, Line by Line

Short answer: Form 6252 is how you tell the IRS that you sold something at a gain and are being paid over more than one tax year. Part I computes a gross profit percentage from the year-of-sale facts. Part II multiplies that percentage by what you received, which is the gain you report. The current form has you complete both parts every year, but the Part I inputs never change after the year of sale — which is why getting them right once governs the whole term. Part III applies only if you sold to a related party.

The whole outcome turns on one number — line 19, the gross profit percentage — and that number is set permanently in the year of sale. Get Part I wrong and every return for the next twenty years is wrong with it.

When you have to file it

You sold property at a gain and will receive at least one payment after the year of sale. §453 then applies automatically — installment reporting is the default, not an election.
You file Form 6252 for the year of sale and for every year after it — the instructions say to file "regardless of whether a payment is received in such year," through the year of final payment or disposition of the obligation. A year with no payment still gets a return.
Losses never go on Form 6252. A loss is reported in full in the year of sale on Schedule D or Form 4797.
Dealer property and inventory are excluded under §453(b)(2). Publicly traded securities are excluded under §453(k).

If you would rather report the entire gain immediately, you elect out under §453(d) by reporting the full gain on a timely filed return for the year of sale. Revoking that election later needs IRS consent under §453(d)(3) — though a missed election can still be made late, on an amended return filed within six months of the due date, under Reg. §301.9100-2.

Before you read further

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Part I — the numbers that set everything

Line	What goes on it	The part people get wrong
5	Selling price, including mortgages and other debts the buyer takes on. Exclude interest.	Debt counts as part of the price even though you never touch the cash.
6	Mortgages, debts and liabilities the buyer assumed or took the property subject to	Includes debt taken "subject to," not just formally assumed.
7	Line 5 minus line 6
8	Cost or other basis	Purchase price plus capital improvements.
9	Depreciation allowed or allowable	§1016(a)(2): depreciation you could have taken reduces basis even if you never claimed it.
10	Adjusted basis (line 8 − line 9)
11	Commissions and other selling expenses
12	Income recapture from Form 4797, Part III	Ordinary recapture under §1245 or §1250 (including §179 and §291), computed and taxed in full this year.
13	Lines 10 + 11 + 12	The full "cost side" of the deal.
14	Line 5 − line 13. Zero or less and you stop here.
15	Gain excluded under §121 (main home)	Most sales enter -0- here.
16	Gross profit (line 14 − line 15)
17	Line 6 − line 13, but not below zero	The debt trap. Any mortgage above your basis plus expenses lands here.
18	Contract price (line 7 + line 17)

The structural fact almost nobody states

Work the algebra, taking line 15 as zero the way most sales do. Contract price = (line 5 − line 6) + (line 6 − line 13) = line 5 − line 13, which is exactly line 14. So whenever line 17 is positive — whenever the debt the buyer takes on exceeds your adjusted basis plus selling expenses plus §1245 recapture — the contract price equals the gross profit and the gross profit percentage is 100%.

Every dollar you collect for the rest of the note is fully taxable gain. There is no basis left to recover. That single mechanic is the reason a highly leveraged, heavily depreciated building is the worst candidate for an installment sale, and it is invisible until someone actually fills out line 17.

Part II — what you report each year

Line	What goes on it
19	Gross profit percentage = line 16 ÷ line 18, as a decimal. Fixed for the life of the note.
20	In the year of sale only, the amount from line 17 — the excess debt, treated as a payment received
21	Payments actually received this year, excluding interest
22	Lines 20 + 21
23	Payments received in prior years
24	Installment sale income = line 22 × line 19
25	The part of line 24 that is ordinary income under the recapture rules
26	Line 24 − line 25, carried to Schedule D or Form 4797

Line 20 is the one that surprises people. Excess debt is not cash, but it is treated as a payment received in the year of sale, so it gets multiplied by the gross profit percentage and taxed immediately.

A worked example

A commercial building sells for $3,000,000. The buyer takes the property subject to a $1,200,000 mortgage, pays $300,000 cash at closing, and signs a $1,500,000 note. The seller paid $1,000,000, has taken $600,000 of depreciation, and pays $180,000 in commissions. No cost segregation, so no §1245 recapture.

Line		Amount
5	Selling price	$3,000,000
6	Debt assumed	$1,200,000
7		$1,800,000
10	Adjusted basis ($1,000,000 − $600,000)	$400,000
11	Selling expenses	$180,000
13	Total	$580,000
16	Gross profit	$2,420,000
17	Excess debt ($1,200,000 − $580,000)	$620,000
18	Contract price	$2,420,000
19	Gross profit percentage	100%
20	Deemed payment — excess debt	$620,000
21	Cash received	$300,000
24	Reported gain, year one	$920,000

The seller collected $300,000 at closing — and keeps $120,000 of it after the $180,000 of commissions — while reporting $920,000 of gain. At a blended 25%/20% plus the 3.8% net investment income tax and California rates, the year-one tax bill exceeds the year-one cash. The deal did not fail — the underwriting did. The mortgage should have been paid down or the sale restructured before the purchase agreement was signed, because none of it is fixable afterward.

Change one input — a $300,000 mortgage instead of $1,200,000 — and line 17 is zero, the contract price becomes $2,700,000, the gross profit percentage drops to 89.6%, and the year-one reportable gain falls from $920,000 to roughly $269,000 on the same cash.

What Form 6252 does not do

It does not spread ordinary recapture. §453(i) forces recapture income from Form 4797 Part III into the year of sale — and §453(i)(2) defines that by reference to **§1245 or §1250**, so the ordinary slice of a cost-segregated land improvement is caught too, not just equipment. It shows up on line 12, raises your basis on line 13, and is taxed now regardless of when you are paid.
It does not reorder your gain in your favor. Reg. §1.453-12 makes unrecaptured §1250 gain come out first as payments arrive, so the 25% layer is consumed before the lower-taxed capital gain.
It does not handle the §453A interest charge. If the sale price exceeds $150,000 and your outstanding installment obligations from the year exceed $5,000,000, you owe interest on the deferred tax, computed separately and carried to Schedule 2. Farm property and personal-use property are outside it.
It does not protect a related-party sale. Under §453(e), if a related party resells the property within two years, your deferred gain accelerates. That is what Part III polices.

Part III — related-party sales

If you sold to a related party after May 14, 1980, you complete Part III for two years after the sale and report whether the related party resold the property. A resale inside that window generally accelerates your remaining gain, with exceptions for involuntary conversions, a death, and sales where you can satisfy the IRS that tax avoidance was not a principal purpose. Marketable securities have no two-year window at all — any resale triggers acceleration.

Where a structured installment sale changes the picture

Ordinary seller financing leaves you holding the buyer's credit for the entire term. A structured installment sale keeps the §453 tax treatment and the same Form 6252 math, but the buyer pays cash at closing and the payment obligation is assigned to a highly rated life insurance company, which funds the schedule. You still file Form 6252 every year. What changes is who owes you the money.

The mechanics are identical, so everything above still governs the outcome: run line 17 before you sign, and know your gross profit percentage before you agree to a payment schedule.

Frequently asked

Q: Do I have to file Form 6252 every year? A: Yes — for the year of the disposition and all subsequent years, and the instructions are explicit that this applies "regardless of whether a payment is received in such year," through the year of final payment or disposal of the obligation. Interest you receive is reported separately as interest income, not on Form 6252.

Q: What is the gross profit percentage on Form 6252? A: Line 19 — gross profit (line 16) divided by contract price (line 18). It is the fraction of each payment that is taxable gain, and it is fixed in the year of sale and applied to every payment for the life of the note.

Q: How does an assumed mortgage affect Form 6252? A: Debt the buyer assumes or takes subject to is added to the selling price on line 5 and subtracted on line 6. Any amount by which that debt exceeds your adjusted basis plus selling expenses shows up on line 17, is treated as a payment received in the year of sale on line 20, and is taxed immediately even though you receive no cash.

Q: Can I elect out of installment reporting? A: Yes. Under §453(d) you elect out by reporting the entire gain on a timely filed return, including extensions, for the year of sale. Miss it and Reg. §301.9100-2 gives automatic relief on an amended return filed within six months of the due date, marked "Filed pursuant to section 301.9100-2." It is revoking an election you already made that needs IRS consent, under §453(d)(3).

Q: Does Form 6252 handle depreciation recapture? A: Only partly. §1245 recapture is computed on Form 4797 Part III, entered on line 12, and taxed in full in the year of sale under §453(i). Unrecaptured §1250 gain does spread across payments, but Reg. §1.453-12 makes it report before your lower-taxed capital gain.

Q: What if I never claimed depreciation on the property? A: Line 9 asks for depreciation "allowed or allowable." Under §1016(a)(2) your basis is reduced by depreciation you could have claimed, so failing to take it costs you the deduction and still raises your gain. A CPA can often correct missed depreciation with Form 3115.

Q: Do I report interest on Form 6252? A: No. Form 6252 covers principal payments only. Stated interest goes on Schedule B as interest income, and if the contract does not provide adequate stated interest the imputed interest rules under §483 or §1274 recharacterize part of each payment as interest.

Q: What happens on Form 6252 if I sell the installment note? A: Selling, gifting or otherwise disposing of the obligation is a disposition under §453B and accelerates the remaining deferred gain in that year. Cancelling the note in your will does the same thing under §691(a)(5), which is why an installment obligation should not be forgiven at death without modeling the result.

Structured installment sale — the §453 structure where a life carrier, not the buyer, funds the payments
Form 6252 reporting and optimization — planning choices once the form is understood
Depreciation recapture — what lands on line 12 and why it cannot be spread
Depreciation recapture in an installment sale — the §1250 ordering rule in detail
§453A interest charge — what happens above $5,000,000 of obligations
§453 CPA guide — the version to hand your accountant
IRC §453 — the installment sale statute, subsection by subsection

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