How Section 179 Recapture on Disposition Works

Section 179 recapture is the tax you owe when business property you fully expensed under Section 179 stops qualifying for that write-off before its depreciation period ends. The IRS claws back the difference between the deduction you took and the smaller amount you would have claimed under regular depreciation, and that difference is added to your income as ordinary income in the year the problem occurs.¹

Section 179 lets a business deduct the full cost of qualifying property in the year it is placed in service rather than spreading the write-off across its useful life. The trade-off is a condition: the property must remain in qualified business use for the full MACRS recovery period, which is typically five or seven years for equipment.² Break the condition and you give some of the deduction back.

What Triggers Recapture

Two broad situations set off recapture. The first is a drop in business use. If the property is used 50% or less for business in any year during its recovery period, you have a recapture event for that year.³ A delivery truck that starts getting used mostly for personal errands, a computer that becomes the family’s shared machine, a piece of equipment pulled into a hobby project — any of these can push business use below the threshold.

The second is disposing of the property before the recovery period ends. Selling, trading, gifting, or donating all count. An involuntary loss like theft or casualty damage can also trigger the analysis, though reinvesting insurance proceeds into qualifying replacement property within the required timeframe may let you sidestep it.

One event that generally does not trigger recapture is the death of the owner. Property passing to an heir takes a stepped-up basis equal to its fair market value at the date of death, which erases the prior depreciation history, including the Section 179 deduction. The heir starts fresh and only faces recapture risk on depreciation they personally claim going forward.

Whatever the trigger, the recapture amount is always ordinary income. You cannot convert it into a capital gain, and it applies even if you sold at a loss or did not sell at all.

How to Calculate the Recapture Amount

The calculation compares what you actually deducted against what you would have been allowed under straight MACRS depreciation. The excess is what comes back as income.

Identify the full Section 179 deduction you claimed when the property was placed in service.
Calculate the MACRS depreciation you would have been entitled to from that year through the year of the triggering event, as if you had never made the Section 179 election.
Subtract the hypothetical MACRS total from the original Section 179 deduction. The result is the recapture amount.

A Worked Example

A business buys $50,000 of five-year MACRS property in 2023 and expenses the full $50,000 under Section 179. In 2025, business use falls to 40%, triggering recapture. The hypothetical MACRS depreciation for five-year property uses the 200% declining balance method with a half-year convention: 20% in year one, 32% in year two, and 19.2% in year three. Applied to $50,000, that gives $10,000, $16,000, and $9,600, totaling $35,600 of allowable depreciation through 2025.²

The recapture amount is $50,000 minus $35,600, or $14,400. That $14,400 is reported as ordinary income on the 2025 return. The taxpayer then has $14,400 of unrecovered basis left in the property, which can be depreciated over the remainder of the recovery period at the reduced business-use percentage.

The later in the recovery period the triggering event happens, the smaller the recapture. By year three of a five-year asset, standard MACRS has already covered 71.2% of the cost. By year five, there is almost nothing left to recapture. The first two years after placing property in service carry the heaviest exposure.

Vehicles: Where Recapture Hits Hardest

Vehicles are the most common source of Section 179 recapture, because mixed personal and business use is nearly unavoidable. The IRS classifies most passenger vehicles as “listed property,” which brings tighter documentation requirements and a separate recapture framework under Section 280F.³

For a vehicle, business-use percentage is business miles divided by total miles for the year. The IRS expects contemporaneous records: a mileage log kept weekly or at the time of each trip, with the date, destination, business purpose, trip mileage, and odometer readings.⁴ Without a log, you have no defense if the IRS questions whether business use stayed above 50%, and vehicle deductions are one of the more frequent audit triggers for small businesses.

If business mileage drops to 50% or below, recapture applies the same way as for any other property, with one twist. The hypothetical depreciation you compare against is itself subject to the annual passenger automobile limits.⁵ Because those caps hold the hypothetical MACRS figures down each year, the recapture amount on a vehicle is often larger than you would expect.

How to Report Recapture

Recapture is reported on Form 4797, but where on the form depends on what triggered it.⁶

Business-Use Drop

If you still own the property but business use fell to 50% or below, the computation goes in Part IV of Form 4797. Enter the original Section 179 deduction on line 33, the hypothetical MACRS depreciation through the current year on line 34, and the difference on line 35.⁷ The line 35 amount is then reported as other income on the same schedule where you originally claimed the deduction: Schedule C, Schedule E, or Schedule F.³

Sale or Disposition

If you actually sold, traded, or disposed of the property, the transaction runs through Part III of Form 4797, which handles depreciation recapture on dispositions. The Section 179 amount is treated as depreciation previously allowed, so the recapture appears as ordinary income to the extent of gain, flowing through line 31 to your main return.⁷

Form 4797 is required even when no sale occurred. A simple conversion from business to personal use still calls for the form to report the recapture income.⁶

Partnerships and S Corporations

If the entity that claimed the deduction is a partnership or S corporation, the recapture does not stay at the entity level. The entity computes the amount and passes it through to each owner on Schedule K-1.

For S corporations, the K-1 uses two separate codes in Box 17. Code K reports dispositions of Section 179 property, giving each shareholder their share of the sales price, basis, depreciation allowed, and Section 179 deduction originally passed through. Code L reports recapture caused by a drop in business use to 50% or below.⁸ Each shareholder then reports their allocated share on their own Form 4797.

One detail trips up new owners: your share of the recapture is based on your current ownership percentage, not your ownership when the deduction was originally passed through. Buy into an S corporation after the Section 179 property was placed in service, and you can still be allocated recapture income on property you never personally deducted.

Penalties and Record-Keeping

Leaving recapture off a return is an understatement of tax. The standard accuracy-related penalty is 20% of the underpayment attributable to the unreported amount, and it can climb to 40% in cases involving gross valuation misstatements.⁹ On a $14,400 recapture amount taxed in the 24% bracket, the additional tax is roughly $3,456, with a penalty of about $691 on top, plus interest from the original due date. In practice, the recapture issue often surfaces when the IRS is already examining something else, and the adjustments compound.

The IRS generally has three years from the filing date to assess additional tax, but that stretches to six years if unreported income exceeds 25% of gross income shown on the return.¹⁰ Combined with recovery periods of five to seven years, you may need to keep records for a decade or longer from the date property was placed in service. Retain the purchase invoice, the original Form 4562 showing the deduction, and documentation of business use for every year of the recovery period. For vehicles, that means the mileage log. For other equipment, keep records showing where the property is located, how it is used, and any changes in use pattern.

State Tax Treatment

Not every state follows the federal Section 179 rules. Some, including California, decouple from the federal limits and either cap the state-level deduction at a lower amount or disallow it. If your state limited or disallowed the deduction when you originally claimed it federally, the state-level recapture calculation will differ, and in some cases there may be no state recapture at all because the state never allowed the deduction. Check your state’s conformity rules before assuming the federal recapture figure carries over dollar for dollar.

1
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
2
Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System
3
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
4
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
5
Internal Revenue Service. Rev. Proc. 2025-16
6
Internal Revenue Service. About Form 4797, Sales of Business Property
7
Internal Revenue Service. Instructions for Form 4797 – Sales of Business Property
8
Internal Revenue Service. 2025 Shareholder’s Instructions for Schedule K-1 (Form 1120-S)
9
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
10
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection