What Is Section 1231 Property? Recapture, Netting, and Form 4797

Section 1231 property is business property you’ve held for more than one year, and it gets uniquely favorable tax treatment: when you sell at a profit, the net gain is taxed at long-term capital gains rates of 0%, 15%, or 20%; when you sell at a loss, the net loss is treated as ordinary and can offset wages, business income, or any other income without the $3,000 annual cap that limits regular capital losses. That dual treatment is the whole point of the provision. What complicates it in practice is depreciation recapture, which peels off part of any gain and taxes it as ordinary income before Section 1231 treatment applies, plus a five-year lookback rule that can convert current gains into ordinary income if you claimed Section 1231 losses in recent years.

What Qualifies

Two conditions have to be met. You must have held the asset more than one year, and the asset must be used in your trade or business rather than held for personal use or purely as an investment.¹ It also has to be depreciable property or real property used in the business. A delivery truck owned for two years qualifies. A personal car does not, even if you occasionally use it for work.

The one-year holding period is a hard line. Sell equipment at 11 months and any gain or loss is ordinary by default. The clock starts the day after acquisition, so an asset bought January 1 doesn’t cross the mark until January 2 of the following year.

The statute covers a broader range of assets than just buildings and machinery:

Land and buildings used in your business, including warehouses, offices, and rental structures held more than one year.
Equipment, vehicles, furniture, and other depreciable tangible property used in operations.
Timber, coal, and iron ore disposed of under Section 631, which generally requires the owner to retain an economic interest in the resource.¹
Unharvested crops, when sold with the underlying farmland in a single transaction to the same buyer.
Cattle and horses held for draft, breeding, dairy, or sporting purposes for at least 24 months.
Other livestock (sheep, goats, hogs) held for the same purposes for at least 12 months.²

What Doesn’t Qualify

Inventory is out. Anything held primarily for sale to customers is excluded, so a car dealer’s lot inventory isn’t Section 1231 property even though those same vehicles would qualify in a delivery business. The distinction is purpose: assets that generate revenue by being sold to customers are inventory; assets that generate revenue by being used in operations are Section 1231 property.

Accounts receivable are also excluded, as are self-created works like copyrights, manuscripts, and artistic compositions in the hands of the creator. After 2017, self-created patents don’t get capital asset treatment either.³ Selling a book you wrote or a patent you developed produces ordinary income. The same exclusion applies to works you received as a gift from the creator.

How the Netting Produces the Result

At the end of the tax year, you pool all your Section 1231 gains and losses into a single net figure. The direction of the net decides how everything gets taxed.¹

A net gain: every dollar is treated as a long-term capital gain, taxed at 0%, 15%, or 20% depending on your taxable income.⁴ Compared to ordinary income rates that reach 37%, the savings can be large.

A net loss: the entire amount is treated as an ordinary loss. This is where Section 1231 separates from standard capital asset rules. Individual capital losses can only offset capital gains plus $3,000 of other income per year, with the rest carried forward.⁴ An ordinary loss has no such cap. If your business loses $80,000 selling old equipment in a bad year, the full $80,000 can offset wages, business profits, or any other income on your return.

Depreciation Recapture Comes First

Before any gain reaches the Section 1231 pool, the IRS takes back some of the depreciation you claimed while you owned the asset. That step, called depreciation recapture, converts part of your gain into ordinary income regardless of how the netting turns out.³ Only the gain above the recapture amount enters the Section 1231 pool. This is the single most common source of surprise when business owners sell appreciated property.

Equipment and Personal Property Under Section 1245

For tangible personal property like machinery, vehicles, and office furniture, Section 1245 recaptures every dollar of depreciation you ever deducted, up to the amount of gain. Say you bought a $100,000 machine, claimed $60,000 in depreciation, and sold it for $120,000. Your gain is $80,000 (sale price minus the $40,000 adjusted basis). The first $60,000 is ordinary income because it matches your depreciation. Only the remaining $20,000 enters the Section 1231 pool.⁵

Section 1245 recapture is aggressive. Because equipment rarely sells for more than its original cost, the entire gain on many equipment sales ends up as ordinary income.

Buildings and Real Property Under Section 1250

Real property gets friendlier treatment. Buildings depreciated using the straight-line method, which is required for real property placed in service after 1986, face minimal Section 1250 recapture.⁶ The depreciation still gets taxed, but at a different rate. The portion of gain attributable to straight-line depreciation is classified as unrecaptured Section 1250 gain and taxed at a maximum rate of 25%.⁷ Gain beyond total depreciation flows through the Section 1231 pool at standard long-term capital gains rates.

An example: you bought a commercial building for $500,000, claimed $150,000 in depreciation, and sold it for $700,000. Total gain is $350,000. The first $150,000 is taxed at up to 25%. The remaining $200,000 enters Section 1231 netting and, if you have a net gain for the year, gets the lower capital gains rates.

The Five-Year Lookback Rule

Congress anticipated that taxpayers would try to time transactions to claim ordinary losses in lean years and capital gains in good ones. The lookback rule under Section 1231(c) checks whether you took any net Section 1231 losses in the five preceding tax years. If you did, your current-year net gain is reclassified as ordinary income up to the amount of those prior losses that haven’t already been recaptured.¹

How it plays out: suppose you claimed a $10,000 net Section 1231 loss three years ago, which offset your wages at ordinary income rates. This year you have a $25,000 net Section 1231 gain. The first $10,000 is taxed as ordinary income, effectively paying back the earlier tax benefit. Only the remaining $15,000 gets long-term capital gains treatment. Once recaptured, that $10,000 drops out and won’t affect future years.

The rule tracks a rolling five-year window. Losses from six or more years ago no longer count. The IRS calls the running balance “non-recaptured net Section 1231 losses.”

Situations That Change the Result

Involuntary conversions. Section 1231 covers more than voluntary sales. Property destroyed, stolen, condemned, or taken through eminent domain can produce Section 1231 gains or losses.⁸ Casualties and thefts go through a preliminary netting step: if losses from these events exceed gains, none of them enter the Section 1231 pool at all, and they’re treated as ordinary. Only when casualty and theft gains exceed the losses do they flow into the main netting. Government condemnations skip this preliminary step and go directly into the Section 1231 pool.

Sales to related parties. Under Section 1239, any gain on the sale of depreciable property to a related party is treated as ordinary income if the buyer can depreciate the property, overriding Section 1231.⁹ Related parties include corporations or partnerships where you own more than 50%, trusts where you or your spouse is a beneficiary, and estate executor-to-beneficiary sales. Constructive ownership rules attribute shares held by your spouse, children, or controlled entities to you, so indirect ownership can push you past the threshold.

Installment sales. When you sell Section 1231 property for payments spread over multiple years, you can use the installment method to spread gain recognition. But depreciation recapture has to be reported in full in the year of sale, even if you receive no cash that year.¹⁰ Only the Section 1231 portion of the gain, meaning the amount above recapture, can actually be deferred across payments.

Like-kind exchanges. For business real estate, a Section 1031 exchange lets you defer Section 1231 gain by reinvesting in similar property. Since 2018 this is limited to real property; equipment and vehicles no longer qualify.¹¹ Timelines are strict: 45 days from sale to identify replacement property in writing, and 180 days (or your return due date with extensions, whichever is earlier) to close.¹² Touching the cash before closing can disqualify the exchange. The gain is deferred, not eliminated; your basis carries over to the new property.

The 3.8% Net Investment Income Tax. High-income taxpayers may owe an additional 3.8% on Section 1231 gains. The NIIT kicks in when modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly), thresholds that aren’t inflation-adjusted.¹³ If you materially participate in the trade or business that generated the gain, the gain is generally exempt. The tax primarily hits passive activities, such as rentals you don’t actively manage or businesses in which you’re a silent investor.

Reporting on Form 4797

Section 1231 sales are reported on IRS Form 4797, Sales of Business Property. The form has three main parts, and the order you fill them in matters:¹⁴

Part III: depreciation recapture under Sections 1245 and 1250. Complete this first, then carry the recapture to Part II and any remaining gain to Part I.
Part I: Section 1231 gains and losses. The form nets them and routes the result either to Schedule D as long-term capital gain or keeps it on Form 4797 as an ordinary loss.
Part II: ordinary gains and losses that don’t qualify for Section 1231 treatment, including assets held one year or less.

If Part I produces a net gain and you have no non-recaptured Section 1231 losses from the prior five years, that gain transfers to Schedule D as long-term capital gain. If the lookback rule converts part of it to ordinary income, that portion stays on Form 4797.¹⁴ Skipping Part III or filling it out after Part I is where most errors on this form originate.¹⁵

1
Office of the Law Revision Counsel. 26 USC 1231 – Property Used in the Trade or Business and Involuntary Conversions
2
eCFR. 26 CFR 1.1231-2 – Livestock Held for Draft, Breeding, Dairy, or Sporting Purposes
3
Internal Revenue Service. Publication 544, Sales and Other Dispositions of Assets
4
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
5
Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property
6
Office of the Law Revision Counsel. 26 USC 1250 – Gain From Dispositions of Certain Depreciable Realty
7
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
8
Office of the Law Revision Counsel. 26 U.S. Code 1231 – Property Used in the Trade or Business and Involuntary Conversions
9
Office of the Law Revision Counsel. 26 U.S. Code 1239 – Gain From Sale of Depreciable Property Between Certain Related Taxpayers
10
Internal Revenue Service. Publication 537, Installment Sales
11
Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips
12
Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
13
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
14
Internal Revenue Service. 2025 Instructions for Form 4797
15
Internal Revenue Service. About Form 4797, Sales of Business Property