Section 179 recapture: when business use drops to 50% or less

“You may have to recapture the section 179 deduction if, in any year during the property’s recovery period, the percentage of business use drops to 50% or less.” IRS, Publication 946 (2025)

When does section 179 recapture apply?

Section 179 recapture applies when business use of section 179 property drops to 50% or less in any year of the property's recovery period. Pub. 946 (2025) says the recapture amount is ordinary income in Part IV of Form 4797 in that year. Treas. Reg. 1.179-1(e)(2) treats property as not used predominantly in a trade or business if 50 percent or more of its use during any year of the recapture period is for another purpose.

Three situations look similar but follow different rules:

• Business use drops, asset kept: section 179 recapture in Form 4797, Part IV, column (a)
• Listed property, such as a vehicle, drops to 50% or less: section 280F(b)(2) recapture in Part IV, column (b), which includes the section 179 deduction
• Asset sold or otherwise disposed of: no Part IV computation; section 1245 recapture in Part III

Treas. Reg. 1.179-1(e)(1) says that if both section 280F(b)(2) and the section 179 recapture rule apply to the same property, recapture is figured only under section 280F(b)(2). The Instructions for Form 4562 (2025) repeat the rule in their line 1 recapture paragraph: if section 179 property is not used predominantly (more than 50%) in the business at any time before the end of its recovery period, the benefit of the deduction is reported as other income.

Where does each amount go on Form 4797 Part IV?

Each Form 4797 Part IV line has a fixed source, and the column depends on whether the property is listed property. The Instructions for Form 4797 (2025) define lines 33 to 35 differently for column (a), section 179, and column (b), section 280F(b)(2).

Business use evidence drives the whole computation, so mileage logs, equipment usage records or a change in how the client uses the asset are the documents to request. The line 35 instructions also require the taxpayer to increase basis in the property by the recapture amount, and each property is figured separately on an attached statement when more than one is involved. The original deduction is on line 12 of the placed-in-service year's Form 4562, which is the starting point for line 33.

How is the section 179 recapture amount calculated?

The section 179 recapture amount is the section 179 deduction claimed minus the depreciation that would have been allowable on that same cost had the taxpayer not expensed it. Pub. 946 (2025) sets out two steps: figure the depreciation that would have been allowable on the section 179 amount from the year placed in service through the year of recapture, then subtract that total from the section 179 deduction.

1. Use the MACRS rate that would have applied for each prior year at the actual business use
2. For the recapture year, multiply that year's rate by the reduced business-use percentage, as the Pub. 946 example does
3. Subtract the total from the section 179 deduction on line 33

Treas. Reg. 1.179-1(e)(1) calls this the benefit derived from expensing and counts it whether or not the excess reduced tax. An amount not allowed because aggregate section 179 expenses exceeded the section 179(b) dollar limit is not part of the amount expensed. For later years, the regulation figures depreciation as if no section 179 election had been made. A Schedule C or F filer pays self-employment tax on the part of line 35 attributable to the trade or business, per the Instructions for Form 4797 (2025).

What does a section 179 recapture calculation look like?

For example, a sole proprietor bought equipment (5-year property, not listed property) for $60,000 in 2023 and placed it in service that year. She elected a $60,000 section 179 deduction and elected not to claim a special depreciation allowance for 5-year property. Business use was 100% in 2023 and 2024 and dropped to 40% in 2025, when she still owns it. The rates come from Table A-1 (half-year convention) in Pub. 946 (2025).

She reports $24,192 of ordinary income for 2025 and increases her basis in the equipment by $24,192. Of the $60,000 she expensed, $35,808 is what MACRS would have allowed through 2025 at her actual use, and only the $24,192 excess comes back into income. Had business use stayed above 50%, nothing would be recaptured.

What do reviewers check on section 179 recapture?

A reviewer checking section 179 recapture confirms six items, each tied to Form 4797, Pub. 946 or the regulation. The placed-in-service year Form 4562 and the client's business use records are the first documents to pull, since line 33 and the recapture trigger both come from them and neither appears on the current-year return without a workpaper.

Once the asset is later sold, the prior Part IV recapture comes out of depreciation on line 22 under the Step 2 list in the Form 4797 instructions, so it isn't taxed twice. A Schedule C filer reports line 35 on Schedule C, line 6, so the recapture also flows into net profit and self-employment tax for the year. Other section 179 assets need the same test every year until their recovery periods end.