MACRS

The Modified Accelerated Cost Recovery System (MACRS) is the U.S. federal tax system that assigns eligible depreciable property a recovery period, depreciation method, and timing convention. It determines tax cost recovery, not the asset’s financial-reporting useful life or market value.

MACRS is not one universal declining-balance formula. The deduction depends on tax basis, property class, General or Alternative Depreciation System, method, convention, placed-in-service date, business use, special allowances, and elections.

Key Takeaways

• GDS is the default system for much eligible property; ADS is required in specified cases and can also be elected.
• Recovery periods are statutory classifications, not management estimates of economic life.
• GDS uses 200% declining balance, 150% declining balance, or straight line depending on the property class and election.
• Half-year, mid-quarter, and mid-month conventions determine the assumed placement and disposal timing.
• Section 179 and bonus depreciation generally apply before regular MACRS depreciation on remaining basis.
• Tax depreciation and book depreciation require separate schedules and can create deferred tax differences.

The Five Inputs to a MACRS Calculation

1. Depreciable Tax Basis

Tax basis generally begins with eligible cost and is adjusted for business use, credits, reimbursements, prior deductions, purchase-price allocation, and other tax rules. Land is not depreciable, so a real-estate purchase must allocate basis between land and depreciable property.

2. Property Class and Recovery Period

MACRS assigns property to recovery periods. Common GDS periods include 3, 5, 7, 10, 15, and 20 years for personal and land-improvement property, 27.5 years for residential rental property, and 39 years for nonresidential real property. Classification follows the Internal Revenue Code, asset-class guidance, and the property’s actual use.

3. GDS or ADS

The General Depreciation System (GDS) is used for most MACRS property. The Alternative Depreciation System (ADS) generally uses straight line and often longer recovery periods. ADS is required for specified property and tax elections, including some tax-exempt use, foreign use, farming, real-property business, and listed-property circumstances.

An ADS election or requirement can affect other property and future years, so it should not be treated as a casual asset-by-asset preference.

4. Depreciation Method

Elections can permit 150% declining balance or straight line for certain GDS classes. The IRS percentage tables incorporate the switch from declining balance to straight line.

5. Convention

• Half-year: default for applicable property when the other conventions do not apply.
• Mid-quarter: generally required when more than 40% of tested basis is placed in service during the final three months of the tax year.
• Mid-month: applies to residential rental property, nonresidential real property, and specified property.

The convention applies in both the placed-in-service and disposition years.

Calculation Order

A simplified order is:

Then:

As of August 2026, current federal law generally provides 100% bonus depreciation for qualifying property acquired after January 19, 2025. That can reduce remaining regular MACRS basis to zero. Transition, eligibility, election, and state-conformity rules still matter.

Worked Example: Seven-Year Property

A business places $100,000 of qualifying office furniture in service during the year. Assume:

• it is seven-year GDS property
• 200% declining balance applies with the automatic straight-line switch
• the half-year convention applies
• the business claims neither Section 179 nor bonus depreciation
• business use remains 100% and the property is not disposed of early

Using the IRS seven-year half-year table:

The schedule extends into an eighth tax year because the half-year convention splits timing between the first and final years. The table percentages already incorporate the declining-balance method and later switch to straight line.

If the same property qualified for and received 100% bonus depreciation, the regular MACRS table would generally have no remaining basis to depreciate. If only part of the basis qualified or the taxpayer made a valid election out, MACRS would apply to the remaining amount.

MACRS vs. Book Depreciation

A company can use 39-year straight-line MACRS for a nonresidential building while depreciating material book components over different useful lives. The resulting temporary differences can create deferred tax assets or liabilities under the applicable accounting framework.

Property and Transactions Requiring Extra Care

• Real estate: Land must be separated, and residential versus nonresidential use affects recovery period.
• Qualified improvement property: Eligibility and placed-in-service facts affect class and bonus treatment.
• Vehicles and listed property: Business-use thresholds, substantiation, annual limits, and recapture can apply.
• Mixed-use property: Only the qualifying business or income-producing portion is depreciable.
• Used property: MACRS can apply, but bonus eligibility has additional prior-use and related-party tests.
• Dispositions: Allowed or allowable depreciation reduces basis and can affect gain, loss, and recapture.
• Short tax years: Conventions and table calculations require special adjustments.
• State returns: States can use different recovery rules or decouple from federal bonus depreciation.

How to Review a MACRS Schedule

1. Tie original cost and basis adjustments to invoices and the fixed-asset register.
2. Verify ownership, business use, and the placed-in-service date.
3. Confirm asset class, recovery period, GDS or ADS, and elected method.
4. Reperform the mid-quarter test and convention selection.
5. Reconcile Section 179, bonus depreciation, and remaining MACRS basis.
6. Track dispositions, transfers, casualty events, and business-use changes.
7. Reconcile federal tax, state tax, and book schedules separately.
8. Preserve records for allowed or allowable depreciation and later recapture.

Common Mistakes and Limitations

• Treating MACRS recovery period as the asset’s economic useful life.
• Using a simple DDB formula when the IRS table and convention should be applied.
• Classifying all equipment as five- or seven-year property without checking use and asset class.
• Ignoring the mid-quarter test after a large fourth-quarter purchase.
• Applying bonus depreciation after regular MACRS rather than before it.
• Depreciating land or failing to allocate a real-estate purchase.
• Forgetting that real property is part of MACRS but generally uses straight line and mid-month timing.
• Using the federal schedule for book or state reporting without reconciliation.

This page provides general U.S. federal information as of August 2026. It is educational and does not provide tax, accounting, legal, valuation, or investment advice.

FAQs

Authoritative Sources

• IRS Publication 946: How To Depreciate Property
• IRS: About Publication 946
• IRS: About Form 4562, Depreciation and Amortization
• IRS Notice 2026-11: Additional First-Year Depreciation Guidance

Related Terms

• Depreciation explains the separate financial-reporting process.
• Accelerated Depreciation compares front-loaded methods with straight line.
• Bonus Depreciation can deduct qualifying basis before regular MACRS.
• Half-Year Convention explains partial-year and mid-quarter timing.
• Depreciation Recapture addresses tax consequences when property is sold or use changes.
• Carrying Amount is a book measure and should not be confused with adjusted tax basis.