MACRS Depreciation Calculator Guide: Property Classes & Rates (2026)

What Is MACRS Depreciation?

MACRS — the Modified Accelerated Cost Recovery System — is the depreciation method required by the IRS for most business assets placed in service after December 31, 1986. It replaced the old ACRS system under the Tax Reform Act of 1986 and remains the standard today.

The core idea: instead of spreading deductions evenly over an asset’s useful life (as straight-line does), MACRS front-loads deductions into the early years. You get bigger deductions now, which reduces taxable income now, which is worth more than the same deduction in 10 years because of the time value of money.

According to IRS Publication 946, businesses claimed over $1.4 trillionin total depreciation deductions in the most recent reporting year — making it one of the largest business tax deductions in the tax code. Most of that flows through MACRS.

MACRS has two main systems:

• GDS (General Depreciation System): The default. Uses 200% declining balance for most personal property, 150% DB for 15-year and 20-year property, and straight-line for real property. Shorter recovery periods mean faster deductions.
• ADS (Alternative Depreciation System): Required for certain assets (foreign-use, tax-exempt bond-financed, listed property used 50% or less for business). Uses straight-line over longer ADS recovery periods. Can also be elected voluntarily.

For most small businesses, GDS is what you’re using unless your CPA tells you otherwise.

MACRS Property Classes (3-Year Through 39-Year)

Every depreciable asset falls into a recovery class. The class determines the recovery period and the depreciation method. Here are the main GDS property classes under MACRS:

The 7-year class is a catch-all — any property that doesn’t have a specific assigned class and doesn’t have an ADS class life defaults to 7-year GDS property. That’s why most business equipment you buy ends up here.

Half-Year Convention: What It Is and How It Applies

Under MACRS, the “convention” determines how much depreciation you can take in the year you place an asset in service and in the final year of the recovery period. Three conventions exist:

• Half-Year Convention: The default for personal property. You take half a year of depreciation in both Year 1 and the final recovery year, regardless of when the asset was actually purchased. A computer bought in December gets the same Year 1 deduction as one bought in January.
• Mid-Quarter Convention: Required when more than 40% of all personal property placed in service during the year is placed in service during Q4. Treats each asset as placed in service at the midpoint of the quarter it was actually placed in service.
• Mid-Month Convention: Applies to real property (27.5-year and 39-year). Treats all real property as placed in service on the 15th of the month.

The half-year convention extends the recovery period by one calendar year. A 5-year asset takes 6 tax years to fully depreciate under the half-year convention (year 1 is a half year, years 2–5 are full years, year 6 is the other half year).

Year 1 MACRS Percentages Under the Half-Year Convention

These percentages come directly from the MACRS tables in IRS Publication 946. You multiply the asset’s original cost basis by the percentage for each year to get the depreciation deduction. You don’t need to compute the declining balance math yourself — use the table percentages.

MACRS vs Straight-Line: The Tax Savings Difference

MACRS doesn’t change the total amount you depreciate — you still deduct 100% of the cost basis over the recovery period. What it changes is when you get those deductions.

For a 7-year asset costing $100,000, here’s the difference in cumulative deductions over the first 3 years:

At a 25% marginal tax rate, the MACRS front-loading in Years 1–3 saves roughly $5,000–$6,000 in taxes earlier compared to straight-line. That money can be reinvested immediately. Over a portfolio of assets, the cumulative cash flow advantage is significant.

According to a 2022 Tax Foundation analysis, the present value of MACRS depreciation for a 7-year asset is approximately 87 cents per dollarof investment, compared to roughly 80 cents for straight-line — a 7-percentage-point advantage that compounds across a business’s entire capital base.

Section 179 and Bonus Depreciation: Even Faster Deductions

If MACRS is fast, Section 179 and bonus depreciation are faster still. Both let you deduct some or all of an asset’s cost in Year 1 rather than over the recovery period.

Section 179 Expensing

Section 179 allows immediate expensing of qualifying property up to a dollar limit. For 2024, that limit is $1,220,000 (with a phase-out starting at $3,050,000 of total property placed in service). The key constraints:

• Cannot exceed business taxable income for the year (can’t create a loss)
• Does not apply to real property (land, buildings)
• Applies to tangible personal property, off-the-shelf software, and certain qualified improvements
• Any amount over the Section 179 limit carries forward to future years

Bonus Depreciation (Section 168(k))

Bonus depreciation has no dollar limit and can create a net operating loss. The Tax Cuts and Jobs Act of 2017 expanded it to 100% for qualified property placed in service from September 27, 2017 through December 31, 2022. It is now phasing down:

Unlike Section 179, bonus depreciation applies automatically unless you elect out. It also applies to used property (as long as the taxpayer hasn’t previously used it and it wasn’t acquired from a related party).

In practice, most businesses stack these tools: use Section 179 up to the income limit, then use bonus depreciation for any remaining basis, then MACRS for what’s left. Our MACRS Depreciation Calculator shows you how each method affects your Year 1 deduction.

GDS vs ADS: When the Alternative System Applies

Most businesses never think about ADS. But it is required in several situations:

• Listed property used 50% or less for business (cars, computers, etc.)
• Foreign-use property used predominantly outside the United States
• Tax-exempt bond-financed property
• Farming property with pre-production costs (some elections)
• AMT adjustments: Under the corporate AMT, property placed in service after 1986 must use ADS for computing adjusted current earnings

ADS uses the same half-year and mid-month conventions as GDS, but recovery periods are longer (a 5-year GDS asset has a 5-year ADS period too, but a 7-year GDS computer is only 5 years under ADS — the rules vary by asset class). When ADS is required, you lose the accelerated depreciation benefit.

How to Calculate MACRS Depreciation: Step-by-Step

Here is the process for computing MACRS under GDS with the half-year convention:

• Step 1: Determine the property class (3, 5, 7, 10, 15, 20, 27.5, or 39 year)
• Step 2: Determine the convention (half-year, mid-quarter, or mid-month)
• Step 3: Find the applicable percentage from the MACRS table in IRS Publication 946 (Table A-1 through A-20)
• Step 4: Multiply the unadjusted basis (cost) by the table percentage for each year
• Step 5: Reduce the basis by any Section 179 deduction or bonus depreciation taken before computing MACRS on the remaining basis

Example: You buy a $50,000 piece of manufacturing equipment (7-year GDS, half-year convention) in March 2026. No Section 179 or bonus depreciation. Year 1 deduction = $50,000 × 14.29% = $7,145. Year 2 = $50,000 × 24.49% = $12,245. And so on through Year 8 (the final half-year).

Frequently Asked Questions

What is MACRS depreciation?

MACRS (Modified Accelerated Cost Recovery System) is the IRS-mandated depreciation method for most business assets placed in service after December 31, 1986. It uses accelerated methods — primarily 200% declining balance — for personal property like equipment and vehicles, allowing businesses to front-load deductions and reduce taxable income faster than straight-line depreciation.

What MACRS class is my property?

Property class depends on the asset type: computers, cars, and light trucks are 5-year property; office furniture, machinery, and most equipment are 7-year property; land improvements (fences, sidewalks) are 15-year property; residential rental buildings are 27.5-year property; commercial real estate is 39-year property. IRS Publication 946 Appendix B has the complete asset class table.

How does the half-year convention work under MACRS?

The half-year convention treats all personal property as if it were placed in service in the middle of the tax year, regardless of the actual date. You get half a year of depreciation in Year 1, full years in the middle years, and another half year in the final year. If more than 40% of your personal property is placed in service in Q4, the mid-quarter convention applies instead.

What is the difference between GDS and ADS under MACRS?

GDS (General Depreciation System) is the default MACRS system — it uses accelerated methods (200% DB for most personal property, 150% DB for 15-year and 20-year property) with shorter recovery periods. ADS (Alternative Depreciation System) uses straight-line depreciation over longer recovery periods. ADS is required for certain listed property, foreign-use property, and tax preference items for AMT purposes. ADS can also be elected voluntarily.

Can I use straight-line instead of MACRS?

Yes. You can elect straight-line depreciation under MACRS GDS for any property class. The recovery period stays the same, but the deduction is spread evenly instead of front-loaded. This might make sense if you expect higher income — and therefore higher tax rates — in future years. The election is made on a class-by-class basis and is irrevocable for that year.

How does Section 179 differ from MACRS depreciation?

Section 179 lets you deduct the full cost of qualifying property in the year it is placed in service, up to $1,220,000 (2024 limit, adjusted annually for inflation). Unlike MACRS which spreads deductions over multiple years, Section 179 is a first-year expensing election. It is limited to your business taxable income and cannot create a loss. Bonus depreciation has no income limit and can create a loss.