Depreciation Methods Compared: MACRS, Section 179, and Recapture

Depreciation methods compared come down to four practical choices for book purposes — straight-line, declining balance, sum-of-the-years’-digits, and units of production — plus one mandatory framework for federal tax returns: the Modified Accelerated Cost Recovery System, or MACRS, often paired with Section 179 expensing or bonus depreciation. Each method spreads the cost of a business asset differently across its useful life, which changes when you get the deduction, how your financial statements look, and how much tax you owe when you eventually sell.

Straight-Line: Equal Expense Every Year

Straight-line is the simplest method and the most common one for financial reporting. You take the purchase price, subtract the estimated salvage value, and divide the result by the number of years you plan to use the asset. The answer is your annual depreciation expense, and it stays flat for the entire recovery period.

An office desk bought for $1,200 with a $200 salvage value and a five-year life produces $200 of depreciation each year: ($1,200 − $200) ÷ 5. The predictability is the point. Budgets stay clean, and the math is easy to defend. Straight-line fits assets that deliver roughly the same service every year, such as furniture, fixtures, or storage structures where aging doesn’t sharply change performance.

One wrinkle matters for taxes. Under MACRS, salvage value is generally disregarded and the asset is depreciated down to zero using the IRS-prescribed recovery period. Salvage value stays relevant for internal financial reporting, where the goal is to mirror actual economic decline.

Accelerated Methods: More Deduction Up Front

Accelerated methods take larger deductions in the early years and smaller ones later. The reasoning tracks reality: a new truck loses far more value in year one than in year eight. Front-loading the expense also produces bigger tax deductions sooner, which helps cash flow.

Double Declining Balance

Double declining balance applies twice the straight-line rate to the asset’s remaining book value each year. A five-year asset has a 20% straight-line rate, so the double declining rate is 40%. Year one applies 40% to the full cost. Year two applies 40% to the reduced book value. The base shrinks every year, so the annual expense drops on its own.

This method doesn’t subtract salvage from the starting balance the way straight-line does, but depreciation stops once book value reaches the estimated salvage amount. In practice, most businesses switch to straight-line partway through the asset’s life when that produces an equal or larger deduction, and under MACRS the switch happens automatically through the IRS depreciation tables.¹

150 Percent Declining Balance

The 150% declining balance method works the same way but uses 1.5 times the straight-line rate. The acceleration is gentler, landing between straight-line and double declining. Under MACRS, this method is required for 15- and 20-year farm property. Taxpayers can also elect it in place of the 200% method for property in the 3-, 5-, 7-, or 10-year classes, though the election is irrevocable once made.¹

Sum-of-the-Years’-Digits

This method uses a declining fraction based on the remaining years of an asset’s life. For a five-year asset, add the digits 1 through 5 to get 15. Year one multiplies the depreciable base (cost minus salvage) by 5/15, year two by 4/15, and so on down to 1/15. The heaviest expense is in year one, but the tapering pattern differs from declining balance. Sum-of-the-years’-digits shows up more often in financial accounting than on tax returns, where MACRS has largely displaced it.

Units of Production: Depreciation Tied to Actual Use

The units of production method drops the calendar entirely and ties depreciation to output. Divide the depreciable base by the total lifetime output you expect (miles, hours, pages, widgets), and you get a per-unit rate. Multiply by actual output in each period to get that period’s expense.

A printing press bought for $50,000 with no salvage value and an expected life of one million pages has a rate of $0.05 per page. A month producing 40,000 pages costs $2,000 in depreciation. A slow month at 10,000 pages costs $500. Depreciation becomes a variable cost that tracks workload, which gives manufacturing operations an unusually honest picture of how work consumes asset value.

The trade-off is bookkeeping. You need a reliable lifetime output estimate up front and a way to track actual usage each period. For assets with wildly uneven usage, that effort beats spreading cost evenly across years when the machine sits idle half the time.

MACRS: The Required Framework for Federal Taxes

For federal tax purposes, businesses don’t pick freely among these methods. MACRS is mandatory, established under 26 U.S.C. §168.² Every depreciable asset is assigned to a class with a fixed recovery period. You don’t estimate useful life yourself. The IRS assigns it.

Recovery Periods for Common Assets

MACRS groups property by type, not by your circumstances:

3-year property: certain manufacturing tools, racehorses over two years old, and special handling devices.
5-year property: computers, peripheral equipment, copiers, cars, light trucks, and office machinery.
7-year property: office furniture, desks, filing cabinets, and any property without a designated class life.
15-year property: land improvements such as sidewalks, roads, fences, and landscaping.
27.5 years: residential rental property.
39 years: nonresidential real property, including commercial buildings and warehouses.

The default method under the General Depreciation System (GDS) for 3-, 5-, 7-, and 10-year property is 200% declining balance, switching automatically to straight-line when that yields a bigger deduction.¹ Residential and nonresidential real property uses straight-line over the full recovery period.²

Conventions

MACRS uses conventions to standardize when depreciation starts. The default is the half-year convention: every asset placed in service during the year is treated as if bought at the midpoint. You get half a year in year one and the other half in the final year of the recovery period.²

An exception applies when more than 40% of the year’s total depreciable property is placed in service during the last three months. The mid-quarter convention then treats each asset as placed in service at the midpoint of its actual quarter of purchase. The rule prevents businesses from loading purchases into December to grab a full half-year of depreciation.¹

Alternative Depreciation System

The Alternative Depreciation System (ADS) is required in specific situations and uses straight-line over longer recovery periods, producing smaller annual deductions. ADS applies to property used predominantly outside the United States, tax-exempt use property, tax-exempt bond-financed property, and listed property (such as vehicles and computers) used 50% or less for qualified business purposes.¹ Property depreciated under ADS doesn’t qualify for bonus depreciation or Section 179 expensing.

Section 179 and Bonus Depreciation: Deducting the Whole Cost Now

Two provisions let you skip most of the multi-year schedule and take the deduction immediately.

Section 179 Expensing

Section 179 allows a full deduction of qualifying equipment and software in the year it’s placed in service. For tax years beginning in 2026, the maximum deduction is $2,560,000, phasing out dollar-for-dollar once Section 179 property placed in service during the year exceeds $4,090,000.³ The base statutory amounts are $2,500,000 and $4,000,000, adjusted annually for inflation.⁴

A key limit trips up many owners: the Section 179 deduction can’t exceed taxable income from active business operations for the year. Any excess carries forward. Sport utility vehicles face a separate cap of $32,000 for 2026.³

Bonus Depreciation

Bonus depreciation under 26 U.S.C. §168(k) allows a first-year deduction equal to 100% of the cost of qualified property. The One Big Beautiful Bill Act, signed into law in July 2025, permanently set the bonus rate at 100% for qualified property acquired after January 19, 2025.² Bonus depreciation has no dollar cap and no business income limitation, so it can create or increase a net operating loss.

The two provisions can be stacked. A common pattern is to use Section 179 first, up to its limits, then apply bonus depreciation to the remaining cost. For most businesses placing qualifying equipment in service in 2026, the full cost of personal property can be deducted immediately.

What Happens on Sale: Depreciation Recapture

Depreciation reduces your basis in the asset, and when you sell for more than that reduced basis, the IRS reclaims some of the tax benefit through recapture. The method you chose earlier shapes how much you owe on the way out.

For personal property (equipment, vehicles, machinery), gain up to the total depreciation claimed is taxed as ordinary income under Section 1245, not at capital gains rates. The recapture amount is the lesser of total gain or total depreciation claimed.⁵ Section 179 deductions and bonus depreciation are treated the same as regular depreciation for recapture, so aggressive first-year expensing increases the recapture exposure if you later sell at a gain. Any gain above total depreciation claimed generally qualifies as a Section 1231 gain and receives long-term capital gains treatment.⁶

Real property works differently. Because most real property is depreciated using straight-line under MACRS, there is usually no excess depreciation to recapture as ordinary income. Gain attributable to that straight-line depreciation is unrecaptured Section 1250 gain, taxed at a maximum rate of 25%.⁷ Accelerated depreciation on real property placed in service before 1987, under the older ACRS system, triggers ordinary-income recapture on the excess over straight-line.

Comparing the Methods Side by Side

Most businesses run two depreciation schedules: one for tax returns, typically MACRS with Section 179 or bonus depreciation, and one for financial statements, often straight-line. It isn’t double-counting. Tax rules and accounting standards answer different questions.

The gap between the two schedules creates a temporary timing difference. In the early years, tax depreciation usually outruns book depreciation, so current tax is smaller than the income statement implies. That gap sits on the balance sheet as a deferred tax liability. Later, when the tax deduction shrinks or ends while book depreciation continues, the liability unwinds and you pay more tax than the income statement alone would predict.

The practical trade-offs:

Straight-line produces the same expense each year. Simplest to calculate and explain, preferred for financial reporting on steady-value assets, and it generates the smallest early deductions on a tax return.
Accelerated methods (declining balance and sum-of-the-years’-digits) front-load expense, cutting taxable income and reported earnings early. They better reflect fast-depreciating assets like technology and vehicles, and they create larger book-tax timing differences.
Units of production makes expense move with actual use. It fits manufacturing equipment and delivery vehicles well, but it makes results less predictable period to period.
MACRS combined with Section 179 or bonus depreciation maximizes early tax deductions and can zero out the cost of qualifying property in year one. It produces the largest book-tax difference, the biggest deferred tax liability, and leaves no further depreciation in future years.

The right method depends on what you’re optimizing: steady reported earnings, maximum current cash flow, or a faithful picture of how the asset actually loses value. Many businesses run straight-line on the books and the most aggressive available method on the tax return, keeping a clean financial statement while capturing the largest immediate deduction the code allows.

1
Internal Revenue Service. Publication 946, How To Depreciate Property
2
Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System
3
Internal Revenue Service. Revenue Procedure 2025-32
4
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
5
Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property
6
Internal Revenue Service. Publication 544, Sales and Other Dispositions of Assets
7
Internal Revenue Service. Topic No. 409, Capital Gains and Losses