Can You Take Section 179 If You Have a Loss?

You can elect Section 179 in a loss year, but you cannot use it to deepen the loss. If you have a loss, Section 179 is capped at your taxable income from all active trades or businesses, so a business running in the red gets a current-year deduction of zero. The election is still worth making: the disallowed amount carries forward indefinitely, and W-2 wages or income from another active business can lift the ceiling enough to use some of it now.¹

Why a Loss Blocks the Deduction

Section 179(b)(3) draws a hard line. The amount you expense in any tax year cannot exceed the total taxable income you earned from actively running a trade or business that year.¹ If your businesses collectively generate $40,000 in net income, your deduction stops at $40,000. If they collectively generate a loss and you have no other active business income, the deduction for this year is zero.

Congress built Section 179 to offset existing profit, not to manufacture losses that would feed refund claims. The deduction reduces tax in a profitable year. It does not drive taxable income below zero the way some other deductions can.

This limit is separate from the annual dollar cap and the phase-out threshold. A business can clear the dollar cap easily and still lose most of the deduction to the income rule. That is where year-end equipment buys go wrong: someone writes a check in December expecting the full write-off, then finds in April that income was too thin to support it.

What Counts as Income for the Section 179 Ceiling

The “taxable income” that sets your ceiling is not the final figure on your return. It is a special computation that strips out items that would otherwise distort the picture of raw business earnings. You compute it without regard to:²

The Section 179 deduction itself (otherwise the calculation would chase its own tail).
The deduction for one-half of self-employment taxes.
Any net operating loss deduction from other years.

For a sole proprietor, start with Schedule C net profit and apply the add-backs. Two Schedule C businesses get combined. For S corporation and partnership owners, the limitation applies first at the entity level and then again at the individual level, where income from all active businesses is aggregated.¹

W-2 Wages Lift the Ceiling

Here is the detail that rescues many loss-year situations. If you also work as an employee, your W-2 wages count as income from the active conduct of a trade or business for Section 179 purposes. The regulation treats employees as actively conducting the trade or business of their employment.³

Say you earn $80,000 from a day job and your side business posts a $10,000 loss. Your aggregate active business income for Section 179 purposes is $70,000, not negative $10,000. You can claim up to $70,000 in Section 179 deductions on qualifying equipment the business placed in service. Spouses filing jointly can combine wages the same way. Without this rule, many business owners assume a loss ends the conversation. It doesn’t.

The Carryforward Is Indefinite

When the income limit blocks part or all of your Section 179 election, the blocked amount is not lost. It carries forward to the next tax year and is treated as if it were a new Section 179 expense in that year.¹ There is no expiration date. You can carry it one year or twenty, waiting for an active business income figure large enough to absorb it.

One catch. The carryforward competes with any new Section 179 property you place in service in the carryforward year. Both the carryover and the new election remain subject to that year’s dollar limit and taxable income limit. If you carry $200,000 forward and also elect $300,000 on new equipment the following year, the combined $500,000 has to fit within both ceilings.

Track the carryforward on Form 4562. Line 10 of the 2025 form captures the disallowed deduction carried from the prior year.⁴ Lose the number and you lose the deduction as a practical matter, even though the legal right survives.

When You Actually Want a Loss: Bonus Depreciation

If you need to maximize current-year deductions even at the cost of generating a net operating loss, bonus depreciation under IRC Section 168(k) is the tool that Section 179 is not. Bonus depreciation has no taxable income limitation. It can push business income negative and create an NOL that carries forward to offset future income.

The One, Big, Beautiful Bill Act, signed into law in 2025, restored a permanent 100% first-year bonus depreciation deduction for qualified property acquired after January 19, 2025.⁵ That replaced the phasedown schedule that had been reducing the percentage by 20 points per year since 2023. For property placed in service in 2026, the full 100% write-off is available.

A transitional election also exists. For the first tax year ending after January 19, 2025, taxpayers may elect 40% bonus depreciation instead of 100%, or 60% for property with longer production periods and certain aircraft. That election helps taxpayers who want some acceleration without a large NOL.

The practical move in a low-income year is to apply bonus depreciation to the full asset cost rather than electing Section 179. Bonus depreciation has no income floor, so you write off the equipment now and carry the resulting NOL forward. Section 179 is the better choice when you have enough income to absorb the deduction, because you control exactly how much to expense and can preserve basis for future years if you prefer.

The Excess Business Loss Cap

Even with bonus depreciation, another rule may cap how much loss you can use right away. Under IRC Section 461(l), noncorporate taxpayers cannot deduct business losses exceeding their business income by more than a threshold amount. For 2025, that threshold was $313,000 for single filers and $626,000 for joint filers.⁶ The 2026 threshold will be inflation-adjusted but has not been published as of this writing.

Any business loss exceeding the threshold becomes an NOL carryforward rather than a current-year deduction. The deduction is not lost, just deferred. Sole proprietors and partners are more likely to hit this ceiling than C corporations, which are exempt from the excess business loss rules.

Recapture If Business Use Later Drops

Taking Section 179 in a profitable year is not necessarily the end of the story. If the business use percentage of the property drops to 50% or below in any year during the recovery period, you must recapture a portion of the deduction as ordinary income.⁷ This comes up most often with vehicles and other listed property that gradually shift toward personal use.

The recapture amount is the difference between the depreciation you actually claimed (including Section 179 and any bonus depreciation) and the depreciation you would have been allowed using the Alternative Depreciation System straight-line method from the start. You report the recapture on Form 4797, and the recaptured amount increases the property’s adjusted basis going forward.

The risk is real for anyone expensing a vehicle or piece of equipment that may not stay above 50% business use for the full recovery period. If you buy a $60,000 truck, expense the entire cost, and two years later start using it mostly for personal errands, you will owe tax on the excess depreciation in the year the business use drops.

State Rules Don’t Automatically Follow

Federal Section 179 treatment does not automatically apply on your state return. Some states conform fully, others impose lower caps or exclude certain property types, and a handful either disallow Section 179 or limit it well below the federal ceiling. If you operate in a nonconforming state, you may owe state tax on income that was fully sheltered federally. Check your state’s current conformity rules before assuming the federal result carries over.

1
Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets
2
Internal Revenue Service. Instructions for Form 4562 (2025)
3
eCFR. 26 CFR 1.179-2 – Limitations on Amount Subject to Section 179 Election
4
Internal Revenue Service. Form 4562 – Depreciation and Amortization (2025)
5
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
6
Internal Revenue Service. 2025 Instructions for Form 461
7
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property