# Section 179 versus bonus depreciation for rental property

Both expense property in year one, but section 179 needs a trade or business and has dollar and income limits; bonus depreciation does not. Which fits a rental.

## Short answer

Section 179 and bonus depreciation both let a taxpayer deduct the cost of property in the year it is placed in service instead of over its recovery period, and both apply to the kind of 5-, 7- and 15-year property a cost segregation study identifies. They are not interchangeable. Section 179 is an election limited to property used in the active conduct of a trade or business, capped at $2,500,000 for 2025 with a phase-out above $4,000,000 of purchases, and limited to business taxable income, with the excess carried forward. Bonus depreciation is automatic unless you elect out, has no dollar cap and no income limit, and for qualified property acquired after January 19, 2025 is a permanent 100 percent. For most rental owners bonus depreciation is the operative rule and section 179 is a question mark, because whether a rental activity is a trade or business is a fact question. Neither rule changes the passive activity limits or the recapture at sale. This article compares them for rental property. It is general education, not tax advice.

## Side by side

| | Section 179 | Bonus depreciation |
|---|---|---|
| How it applies | Election, property by property | Automatic for qualified property unless you elect out by class |
| Eligible property | Tangible section 1245 property acquired by purchase for use in the active conduct of a trade or business; by election, qualified real property on nonresidential buildings (QIP, roofs, HVAC, fire protection, security) | Qualified property: generally property with a recovery period of 20 years or less, new or used with conditions |
| The building | Never | Never; 27.5- and 39-year property is not qualified property |
| Dollar limit (2025) | $2,500,000, reduced dollar for dollar above $4,000,000 of section 179 property placed in service | None |
| Income limit | Cannot exceed taxable income from the active conduct of a trade or business; excess carries forward | None |
| Rate | Up to 100 percent of cost, at the taxpayer's chosen amount | 100 percent for qualified property acquired after January 19, 2025; earlier phase-down for earlier acquisitions; one-time transition election |
| Rental property | Only if the rental activity is a trade or business; not for property held merely to produce income | Applies to the rental's qualified property regardless of trade-or-business status |
| Recapture at sale | Ordinary income on section 1245 property | Ordinary income on section 1245 property |

## The trade-or-business question

Section 179 property must be acquired for use in the active conduct of a trade or business. Publication 946 adds that section 179 does not apply to property held merely to produce income. Whether a particular rental activity rises to a trade or business depends on the facts, including the scale and regularity of the owner's involvement, and is a determination your adviser makes. A single passive rental managed by a third party may not qualify; an owner operating several properties as a business may. The older exclusion for property used in connection with furnishing lodging no longer applies, because the section 179 definition now excludes section 50(b) property other than the lodging paragraph, so furniture and appliances in a rental are not disqualified on that ground alone. The trade-or-business requirement is the real gate.

Bonus depreciation has no such requirement. A rental's 5-, 7- and 15-year property is qualified property whether or not the activity is a trade or business, which is why bonus depreciation is the rule most rental owners actually use after a study.

## Where section 179 adds something

- **Choosing the amount.** Section 179 can be taken on some assets and not others, and in any amount up to cost, which lets an owner fine-tune a deduction in a year when full bonus depreciation would be more than they can use. Bonus depreciation is all or nothing by class, though the transition election offers a lower rate for one year.
- **Qualified real property.** On a nonresidential building, section 179 reaches roofs, HVAC, fire protection and security systems, which are not qualified property for bonus depreciation because they are part of the 39-year building. That is a commercial-building benefit; it does not reach residential rental property.
- **State conformity.** Some states that decouple from bonus depreciation follow section 179 more closely, or with different limits. Your adviser will know.

## Where bonus depreciation is the only choice

- The rental is not a trade or business.
- The deduction would exceed business taxable income, since section 179 stops there and carries forward.
- The year's purchases exceed the section 179 phase-out.
- The owner wants the deduction without an election on each asset.

## What neither rule changes

1. **The passive activity limits.** A first-year deduction that creates a rental loss is still passive for most owners, usable against other income only within the special allowance or under real estate professional status. Both rules produce the deduction; neither makes it usable.
2. **Recapture.** Amounts expensed under either rule are depreciation for recapture purposes, taxed as ordinary income on section 1245 property at sale.
3. **The building.** Neither rule reaches the 27.5- or 39-year building.
4. **The study.** Both rules act on the classified assets a study produces; without a study, most of a building's price sits where neither rule applies.

## A note on timing

Both rules act in the year the property is placed in service, and both are decided on the return for that year. Section 179 is elected on the return; bonus depreciation applies unless the election out is made on the return. Neither can be applied retroactively to a prior year by amendment in the ordinary course, which is one more reason to have the study's asset list, with dates, before the return is filed rather than after.

## A decision sequence for a rental owner

1. Get the asset list from the study: 5-, 7- and 15-year property by acquisition date.
2. Ask the adviser whether the rental activity is a trade or business for section 179 purposes.
3. Model the passive activity position: how much of a deduction can be used this year.
4. Apply bonus depreciation to the qualified property, or elect out by class, or make the transition election, as the model suggests; consider section 179 on specific assets only where it is available and adds control.
5. Record elections on the return; keep the study with the tax records.

## What people ask on Reddit and other forums

"Section 179 or bonus" is asked weekly in the "cost segregation reddit" threads on r/tax and r/realestateinvesting. The searches that lead people to these threads are usually phrased "section 179 vs bonus depreciation", "section 179 rental property" and "bonus depreciation rental property".

**"Can I 179 the appliances in my rental?"** Only if the rental activity is a trade or business and the other section 179 conditions are met. The old lodging exclusion no longer applies, but the trade-or-business requirement does. Bonus depreciation reaches the same appliances without that question.

**"Which one is better?"** Bonus depreciation applies more broadly and has no caps; section 179 offers control over the amount and reaches some building systems on nonresidential property. Most rental owners use bonus depreciation; some use section 179 to fine-tune.

**"Can I use both?"** On different assets, yes, subject to each rule's conditions and ordering on the return. Your adviser decides.

**"Does either get me out of the passive loss rules?"** No.

## Questions people also ask

### Can you take section 179 on rental property?

Only if the rental activity is the active conduct of a trade or business, and only on qualifying property, within the dollar and income limits. Property held merely to produce income does not qualify.

### Does bonus depreciation apply to rental property?

Yes, to the rental's qualified property with a recovery period of 20 years or less, at 100 percent for property acquired after January 19, 2025.

### What are the section 179 limits for 2025?

A $2,500,000 maximum, reduced dollar for dollar when section 179 property placed in service exceeds $4,000,000, and a business taxable income limit with carryover.

### Can section 179 cover a roof on an apartment building?

No. The qualified real property categories apply to nonresidential real property.

### Is the recapture different between the two?

No. Both are depreciation for recapture purposes; on section 1245 property the recapture is ordinary income.

## Sources

- https://www.law.cornell.edu/uscode/text/26/179 — 26 U.S.C. §179(d)(1) and §179(e).
- https://www.irs.gov/publications/p946 — IRS Publication 946 (2025), How To Depreciate Property: Chapter 2 (section 179) and Chapter 4 (property classes).
- https://www.irs.gov/newsroom/treasury-irs-issue-guidance-on-the-additional-first-year-depreciation-deduction-amended-as-part-of-the-one-big-beautiful-bill — IR-2026-06 (January 14, 2026), bonus depreciation guidance.
- https://www.irs.gov/publications/p925 — IRS Publication 925 (2025), Passive Activity and At-Risk Rules.
- https://www.irs.gov/publications/p544 — IRS Publication 544 (2025), Sales and Other Dispositions of Assets: Chapter 3.

## Related reading

- [Bonus depreciation and cost segregation after the 2025 law](/articles/bonus-depreciation-and-cost-segregation)
- [Qualified improvement property and cost segregation](/articles/qualified-improvement-property)
- [Why a deduction is not a refund](/articles/why-a-deduction-is-not-a-refund)
- [The de minimis safe harbor and small purchases](/articles/de-minimis-safe-harbor-rental)
- [Acquisition date vs placed-in-service date](/articles/acquisition-date-vs-placed-in-service-date)
- [What Reddit asks about cost segregation, answered with sources](/articles/cost-segregation-questions-from-reddit)
- [Find a practitioner in the NBCSS directory](/directory)

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Published: 2026-09-25 · Last content change: 2026-09-25
Not professional advice: general educational information from the National Board of Cost Segregation Specialist (NBCSS); not accounting, tax, legal, financial, investment or engineering advice. Verify with a licensed CPA, enrolled agent, attorney or other qualified adviser before acting.