Useful Life and Recovery Periods for Depreciable Assets

Recovery periods for depreciable assets run from 3 years for the shortest-lived equipment to 39 years for commercial buildings, and the length is set by the IRS based on what the asset is and how it’s used in your business. You don’t estimate useful life yourself. You match your asset to a class in IRS Publication 946, and the class fixes the timeline.¹ Two things override that default timeline in a big way: Section 179 expensing and 100-percent bonus depreciation, either of which can let you write the whole cost off in year one.

To find your recovery period, you need three facts about the asset: a clear description, the date it was placed in service, and its cost basis. “Placed in service” is the day the asset is ready and available for use, not the day you first use it. A rental house is placed in service when it’s ready to rent, not when a tenant moves in.² Cost basis includes the purchase price plus sales tax, delivery, and installation.

GDS Class Lives for Personal Property

The General Depreciation System is the default. It sorts tangible personal property into seven classes.³

3-year property. Over-the-road tractor units, racehorses placed in service after age two, and qualified rent-to-own property.
5-year property. Automobiles, taxis, buses, trucks, and non-commercial helicopters; computers; office machinery like copiers and calculators; and research and experimentation equipment.
7-year property. Office furniture and fixtures (desks, file cabinets, safes) and agricultural machinery. Any asset without a specifically assigned class life also defaults here.
10-year property. Vessels, barges, tugs and similar water transportation equipment; single-purpose agricultural structures; and fruit- or nut-bearing trees and vines.
15-year property. Land improvements outside of farming (sidewalks, roads, shrubbery, fences) and qualified improvement property.
20-year property. Farm buildings other than single-purpose agricultural structures, certain municipal sewers, and initial land-clearing work for utility transmission plants.
25-year property. Water utility property, including infrastructure for gathering, treating, or commercially distributing water, and certain municipal sewers not in the 20-year class.

These classifications are codified in Section 168 of the Internal Revenue Code.⁴ When an asset doesn’t fit a specific description, Publication 946 also carries activity-based tables that match assets to the industry they support. The seven-year default catches most items that fall through the cracks.

Recovery Periods for Buildings and Improvements

Real property runs on much longer timelines than equipment, and the category splits based on how the building earns income.

Residential Rental: 27.5 Years

A building where 80 percent or more of gross rental income comes from dwelling units is residential rental property, recovered over 27.5 years. Dwelling units are houses or apartments used as living spaces. Hotels and motels rented on a short-term transient basis do not count as dwelling units, so a building full of nightly rentals can fail the 80-percent test even though every unit has a bed in it.⁵ The test is applied each year, so a shift in the tenant mix can move a building in or out of the class.

Nonresidential Real Property: 39 Years

Buildings that don’t meet the 80-percent residential test — office buildings, warehouses, retail stores — are nonresidential real property with a 39-year recovery period.³

Qualified Improvement Property: 15 Years

Interior improvements to nonresidential buildings get a much faster write-off. Qualified improvement property is any improvement to the inside of a nonresidential building made after the building was first placed in service. It does not include enlargements, elevators or escalators, or changes to the building’s internal structural framework.¹ Improvements that qualify sit in the 15-year GDS class instead of the 39-year period that applies to the building shell. For a commercial tenant building out leased space, that difference is often the single largest depreciation benefit available.

Land Is Not Depreciable

Land never wears out, so it cannot be depreciated.¹ When you buy improved property, you have to allocate the purchase price between the building and the land underneath it. Getting that split right matters: an inflated land allocation permanently reduces the amount you can depreciate.

When You Must Use the Alternative Depreciation System

The Alternative Depreciation System (ADS) uses longer recovery periods and the straight-line method, producing smaller annual deductions. It’s mandatory for property used predominantly outside the United States, property financed with tax-exempt bonds, property leased to tax-exempt organizations, and certain farming property held by businesses that elect out of the interest deduction limitation.⁴ Some taxpayers elect ADS voluntarily to smooth deductions over a longer period.

ADS periods generally track the asset’s full class life rather than the compressed GDS timeline. Equipment that’s 5-year property under GDS might have a 9- or 12-year class life under ADS. Personal property with no assigned class life defaults to 12 years under ADS, compared to 7 under GDS. Real property shifts too. Nonresidential real property moves from 39 years under GDS to 40 under ADS.⁶ Residential rental property placed in service before 2018 follows a 40-year ADS schedule, and a 30-year ADS period is available for certain real property trade or business elections.⁵ Electing ADS for a class of property is generally irrevocable.

Section 179 and Bonus Depreciation Can Compress the Timeline to One Year

Recovery periods assume you’re spreading cost across multiple years. Two provisions let you skip most of that.

Section 179 Expensing

Section 179 lets you deduct the full cost of qualifying equipment and software in the year it’s placed in service, up to a dollar cap. The statutory base is $2,500,000 for tax years beginning after 2024, with annual inflation adjustments, and the deduction phases out dollar for dollar once total qualifying purchases exceed a $4,000,000 base threshold.⁷ The 2026 inflation-adjusted deduction limit is approximately $2,560,000 with a phase-out threshold around $4,090,000. The IRS publishes exact figures each year in a revenue procedure.

Section 179 covers tangible personal property, off-the-shelf software, qualified improvement property, and certain other categories. Your deduction cannot exceed your taxable business income for the year; any excess carries forward.

100-Percent Bonus Depreciation

Bonus depreciation under Section 168(k) works alongside Section 179 and has no dollar cap. The One Big Beautiful Bill Act permanently restored 100-percent bonus depreciation for qualifying property acquired after January 19, 2025.⁴ You can write off the entire cost of eligible personal property in year one regardless of amount, and unlike Section 179, bonus depreciation can create or increase a net operating loss.

Bonus depreciation applies automatically unless you elect out. A taxpayer who prefers smaller current deductions can elect 40 percent instead of the full 100 percent for the first tax year ending after January 19, 2025. The election applies to the entire class of property, not individual assets.

Vehicles and Other Listed Property Have Extra Limits

Annual Caps on Passenger Automobiles

Passenger automobiles are 5-year property, but they also face annual dollar limits regardless of what the vehicle cost. For vehicles placed in service in 2026 with bonus depreciation, the caps are $20,300 in year one, $19,800 in year two, $11,900 in year three, and $7,160 for each year after that until the cost is fully recovered.⁸ Without bonus depreciation, the year-one cap drops to $12,300.

The caps apply to four-wheeled vehicles manufactured for use on public roads with an unloaded gross vehicle weight of 6,000 pounds or less (gross vehicle weight for trucks and vans).⁹ Vehicles above that threshold escape the annual caps, which is why heavy SUVs and trucks show up so often on business purchase lists. SUVs between 6,000 and 14,000 pounds still face a separate Section 179 limit of roughly $32,000 (inflation-adjusted for 2026) rather than the full Section 179 amount.⁷

The 50-Percent Business Use Test

Certain assets prone to personal use are “listed property.” After the Tax Cuts and Jobs Act removed computers from this category, listed property now primarily includes passenger automobiles, other transportation equipment, and property used for entertainment or recreation, including photographic and video-recording equipment.¹⁰

Listed property must be used more than 50 percent for business to qualify for accelerated depreciation, Section 179, or bonus depreciation. If business use is 50 percent or less, you have to depreciate using straight-line over the ADS recovery period. If business use started above 50 percent and later drops to 50 percent or less, you have to recapture the excess accelerated depreciation as income in the year the use drops.¹ That recapture can produce a surprise tax bill in a year you weren’t expecting one.

Fixing a Wrong Recovery Period

If you used the wrong recovery period, applied the wrong method, or never claimed depreciation you were entitled to, you don’t amend prior returns one by one. You file IRS Form 3115 as a change in accounting method with the return for the year you’re making the correction, and a Section 481(a) adjustment sweeps all the missed or excess depreciation into a single year.¹¹

Most depreciation corrections qualify for the IRS’s automatic consent procedure, meaning no advance permission is required. File Form 3115 with your return, attach the required statements, and complete Schedule E for depreciation-specific changes.¹² The automatic procedure is available if the change appears on the IRS’s published list and you haven’t made or requested a change for the same item within the last five tax years.

If the correction increases taxable income by more than $3,000, the statute lets you spread the tax impact across multiple years rather than absorbing it at once.¹¹ Favorable adjustments, catching up on deductions you missed, are taken entirely in the year of change. The sooner you catch the error, the sooner you get the money back.

1
Internal Revenue Service. Publication 946, How To Depreciate Property
2
Internal Revenue Service. FS-2006-27 – Depreciation Reminders
3
Internal Revenue Service. Publication 946, How To Depreciate Property – Which Property Class Applies Under GDS
4
Office of the Law Revision Counsel. 26 US Code 168 – Accelerated Cost Recovery System
5
Internal Revenue Service. Publication 527, Residential Rental Property
6
Internal Revenue Service. Publication 946, How To Depreciate Property – Recovery Periods Under ADS
7
Office of the Law Revision Counsel. 26 USC 179 – Election To Expense Certain Depreciable Business Assets
8
Internal Revenue Service. Rev Proc 2026-15
9
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
10
Internal Revenue Service. TCJA Training – Depreciation Provisions
11
Office of the Law Revision Counsel. 26 US Code 481 – Adjustments Required by Changes in Method of Accounting
12
Internal Revenue Service. Instructions for Form 3115