Installment Sales: How to Spread Capital Gains Tax Over Multiple Years (IRC 453)

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

An installment sale under IRC 453 is a sale of property where at least one payment is received after the tax year of the sale. The default tax treatment for installment sales is automatic (no election required): the seller reports gain proportionally as payments are received, using the “gross profit ratio” (total gain divided by total contract price). This allows the seller to defer capital gains tax on the unpaid portion of the sale price. For a business owner selling a $1 million asset with $500,000 in gain, an installment sale over 5 years means reporting $100,000 of gain per year instead of $500,000 in Year 1, potentially keeping the seller in a lower tax bracket and deferring $60,000+ in taxes. The installment method is the default for qualifying sales; the seller must actively elect OUT (on Form 6252) to recognize all gain in Year 1.

✓Key takeaway

Installment sale basics:

Factor	Details
Code section	IRC 453
Reported on	Form 6252 (Installment Sale Income)
Default or elective?	Default (applies automatically unless elected out)
Interest required?	Yes, at least the applicable federal rate (AFR)
Who benefits?	Sellers who want to defer capital gains recognition

Gross profit ratio calculation:

Component	Formula
Gross profit	Selling price - adjusted basis
Contract price	Selling price - assumed mortgages (if buyer takes over debt)
Gross profit ratio	Gross profit / Contract price
Taxable gain per payment	Payment received x Gross profit ratio

What qualifies for installment treatment:

Eligible	NOT Eligible
Real estate (investment or business)	Inventory (IRC 453(b)(2))
Business assets (equipment, goodwill)	Publicly traded securities (IRC 453(k))
Privately held stock	Dealer dispositions (IRC 453(b)(2))
Personal property sold at a gain	Depreciation recapture (IRC 453(i), recognized in Year 1)

Key rule: Depreciation recapture isn’t deferrable

Component	Installment Treatment
Capital gain (above original cost)	Deferred over installment period
Section 1250 recapture (25% rate)	ALL recognized in Year 1
Section 1245 recapture (ordinary income)	ALL recognized in Year 1

How does an installment sale work?

Hypothetical example

Round numbers. A business owner sells commercial real estate.

Sale details:

Item	Amount
Selling price	$1,000,000
Original cost (adjusted basis)	$400,000
Accumulated depreciation	$200,000
Adjusted basis (cost - depreciation)	$200,000
Total gain	$800,000
Section 1250 recapture (depreciation, 25% rate)	$200,000
Capital gain (above original cost)	$600,000

Payment terms:

Year	Payment
Year 1 (closing)	$200,000 down payment
Years 2-5	$200,000/year (plus 6% interest)
Total	$1,000,000

Gross profit ratio:

Component	Calculation
Gross profit	$1,000,000 - $200,000 = $800,000
Contract price	$1,000,000
Gross profit ratio	$800,000 / $1,000,000 = 80%

Year 1 tax (CRITICAL: recapture is front-loaded):

Item	Amount	Tax Rate	Tax
Section 1250 recapture (ALL in Year 1)	$200,000	25%	$50,000
Capital gain portion of Year 1 payment ($200,000 x 80% = $160,000, minus $200,000 recapture already counted)	$0 (recapture absorbs the Year 1 gain)	N/A	$0
Interest income (Year 1)	Minimal (partial year)	Ordinary rates	Minimal
Year 1 total tax			$50,000

Wait. Let me recalculate. The $200,000 payment x 80% gross profit ratio = $160,000 of gain recognized in Year 1. BUT the $200,000 recapture must ALL be recognized in Year 1 regardless of how much is received. So:

Item	Amount
Gain recognized from installment payment ($200,000 x 80%)	$160,000
Additional recapture recognized (regardless of payment)	$200,000 - already included?

Under IRC 453(i), the $200,000 recapture is recognized in Year 1 even though only $200,000 was received. The recapture is treated as received in Year 1.

Corrected Year 1:

Item	Amount	Tax Rate	Tax
Depreciation recapture (Section 1250)	$200,000	25%	$50,000
Remaining gain from Year 1 payment	$0 ($160,000 installment gain minus $200,000 recapture = negative, but recapture is a separate bucket)
Year 1 tax			$50,000

The installment gain allocation is complex when recapture is involved. The total gain reported each year combines the installment portion and the recapture, with recapture front-loaded.

Years 2-5 tax (capital gain only):

Year	Payment	Installment Gain (80%)	Tax (15% LTCG)	Interest Income	Interest Tax (32%)
Year 2	$200,000	$160,000	$24,000	$48,000	$15,360
Year 3	$200,000	$160,000	$24,000	$36,000	$11,520
Year 4	$200,000	$160,000	$24,000	$24,000	$7,680
Year 5	$200,000	$160,000	$24,000	$12,000	$3,840

Comparison: Installment sale vs. lump sum

Factor	Lump Sum Sale	Installment Sale (5 years)
Year 1 capital gains tax (on $600K)	$90,000 (15%)	$0 (deferred)
Year 1 recapture tax (on $200K)	$50,000 (25%)	$50,000 (25%, front-loaded)
Year 1 total tax	$140,000	$50,000
Total tax over 5 years	$140,000 (all in Year 1)	$146,000 (spread over 5 years)
Plus interest income tax	$0	$38,400
Total tax paid	$140,000	$184,400

The installment sale costs MORE in total tax ($184,400 vs. $140,000) because the seller earns interest income ($120,000 over 5 years), which is taxed at ordinary rates. The benefit is CASH FLOW: the seller pays $50,000 in Year 1 instead of $140,000, freeing up $90,000 of cash.

When installment sales make sense:

Scenario	Benefit
Seller in high bracket, expects lower bracket in future years	Gain taxed at lower rates
Seller needs to avoid NIIT threshold	Spread income below $250K MFJ MAGI
Buyer can’t pay full price upfront	Enables the sale to happen
Seller wants steady income stream	Predictable annual payments
Estate planning (seller dies during installment period)	Remaining gain gets stepped-up basis

Electing OUT of installment treatment: The seller can elect to recognize all gain in Year 1 by checking the box on Form 6252. This makes sense when:

The seller has large capital losses to offset the gain
The seller expects significantly higher tax rates in future years
The seller wants to invest the full after-tax proceeds immediately

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Installment Sales: How to Spread Capital Gains Tax Over Multiple Years (IRC 453)." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-installment-sale-tax-deferral-irc-453

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.