Introduction

The Modified Accelerated Cost Recovery System (MACRS) calculates depreciation for tax purposes in the US, and its depreciation tables-published in IRS Publication 946, Appendix A-provide pre-calculated percentage rates that eliminate the need for complex formulas. If you manage business property placed in service after 1986, these tables are the foundation for every depreciation deduction on your federal tax returns.

This guide covers the full scope of MACRS depreciation tables: how the general depreciation system and alternative depreciation system tables work, which property classifications map to which tables, how conventions determine your first year depreciation, and how to calculate depreciation step by step. It does not cover state-level depreciation adjustments or international tax treatment, which follow separate rules.

The target audience includes tax professionals, CPAs, real estate investors, and business owners who need to select the correct table, apply the right convention, and maximize tax deductions without triggering compliance issues. Accurate table usage matters because even small classification errors compound across years-overstating or understating annual deductions by thousands of dollars and creating audit exposure.

MACRS depreciation tables from IRS Publication 946 assign fixed depreciation percentage rates to each property class, recovery period, and convention, letting you multiply your depreciable basis by a single percentage to determine each year's depreciation deduction.

After reading this guide, you will be able to:

• Select the correct GDS or ADS table for any depreciable asset

• Apply half-year, mid-quarter, and mid-month conventions accurately

• Calculate depreciation for personal property and real property using table percentages

• Identify and avoid the most common MACRS table errors

• Evaluate cost segregation opportunities that shift assets to shorter-life tables

Understanding MACRS Depreciation Tables

MACRS depreciation tables are IRS-published percentage charts found in Publication 946, Appendix A. Each table assigns a specific depreciation percentage to every year of an asset's recovery period, based on its property class, depreciation method, and applicable convention. The MACRS table provides pre-calculated percentage rates for depreciation, converting what would otherwise require declining balance formulas and straight line switchover calculations into a simple multiplication: depreciable basis × table percentage = that year's depreciation deduction.

Assets used in business generally require MACRS for tax depreciation after 1986, making these tables relevant to most taxpayers filing federal tax returns with depreciable assets. MACRS classifies assets into recovery periods of 3 to 39 years, and the tables cover every class across both depreciation systems.

General Depreciation System (GDS) Tables

The general depreciation system is the default depreciation system for most business property and the primary set of tables most taxpayers will use. GDS tables use accelerated depreciation methods-specifically the 200% declining balance method for 3-, 5-, 7-, and 10-year property, and 150% declining balance for 15- and 20-year property-both switching to straight line when that yields a larger deduction. GDS uses shorter recovery periods than ADS, which means larger early-year deductions and faster cost recovery.

GDS allows accelerated depreciation methods for larger early deductions, making it the preferred choice for taxpayers seeking to maximize first year depreciation and near-term tax savings. Table A-1 in Publication 946 is the most commonly referenced table, covering personal property under the half year convention with the 200% declining balance method.

Alternative Depreciation System (ADS) Tables

The alternative depreciation system uses the straight line method exclusively, with longer recovery periods that produce smaller, even annual deductions spread across more years.

ADS is required for tax exempt use property, listed property used less than 50% for business, property used predominantly outside the United States, and property financed with tax-exempt bonds. It is also available as an optional election for any property class when a taxpayer prefers predictable, level deductions. ADS generally has longer recovery periods than GDS-for example, nonresidential real property uses a 40-year ADS period versus 39 years under GDS.

Because conventions and table structure still vary under ADS (half-year or mid quarter convention for personal property, mid month convention for real property), taxpayers must still select the correct ADS table from Publication 946 rather than simply dividing basis by recovery years.

MACRS Table Categories and Property Classifications

Every depreciable asset must be assigned to a specific property class before you can select the correct table. MACRS property classes determine the recovery period for assets, and each class corresponds to specific tables organized by convention and method. Getting this classification right is the single most important step-choosing the wrong asset class means using the wrong depreciation rate for every year of the asset's life.

Personal Property Tables (3-Year Through 20-Year)

The recovery periods for personal property under MACRS can range from 3 to 39 years, though most personal property falls into the 3- through 20-year classes. Table A-1 covers most personal property under the half year convention using the 200% declining balance method. This is the default table for qualifying assets like other equipment, vehicles, computers, and office furniture.

Common classifications include:

• 5-year property: Includes vehicles and computers under MACRS, along with other equipment used in general business operations

• 7-year property: MACRS assigns 7-year property to office furniture and equipment, fixtures, and most tangible property not assigned to another class

• 15-year property: Covers land improvements such as fences, roads, sidewalks, and landscaping

• 3-year property: Certain special agricultural assets, some farm property, and qualifying horses

When the mid quarter convention applies-triggered when more than 40% of the total depreciable basis of personal property placed in service during the tax year falls in the fourth quarter-taxpayers must use quarter-specific tables (Tables A-2 through A-5) instead of Table A-1. The mid-quarter convention is triggered by over 40% Q4 purchases, and when it applies, every piece of personal property placed in service that same year must follow the mid-quarter tables, not just the assets acquired in the final quarter.

Real Property Tables (27.5-Year and 39-Year)

Real property depreciation tables use the straight line method exclusively with the mid month convention. The mid-month convention applies to real property depreciation, treating assets as placed in service at the midpoint of the month they enter use.

• Residential rental property is depreciated over 27.5 years using GDS straight line depreciation (Table A-6 in Publication 946)

• Commercial real property is depreciated over 39 years under GDS (Tables A-7 and A-7a)

These tables include month-specific columns showing the first-year depreciation percentage based on the month the property was placed in service. For example, nonresidential real property placed in service in January receives a larger first-year percentage than property placed in service in December, because more months of depreciation are available.

Under ADS, residential property may use a 30-year recovery period and commercial buildings use 40 years, both with straight line and mid-month convention.

Cost Segregation Opportunities

Cost segregation studies can reclassify 20–40% of building costs from 39-year or 27.5-year real property into shorter-life personal property categories-typically 5-, 7-, and 15-year classes. This reclassification can accelerate depreciation from 39 years to shorter periods, fundamentally changing which MACRS tables apply to portions of your building's basis.

Cost segregation studies combine engineering analysis with IRS compliance expertise to identify and document building components-electrical systems, specialty plumbing, flooring, decorative finishes-that qualify as personal property rather than structural components. According to 2026 benchmarks, medical offices, retail, and restaurants typically see reclassification rates around 30–34%, while short-term rentals average approximately 30% and residential condos around 14%.

A cost segregation study shifts these reclassified components from slow straight-line real property tables to accelerated personal property tables, dramatically increasing early-year deductions. For properties above $1 million in basis (excluding land), this analysis often produces material tax benefits. Cost segregation studies can increase first-year tax deductions significantly-for instance, a $5 million office building can yield $340,000 in first-year tax savings through proper reclassification alone.

Calculating Depreciation Using MACRS Tables

With the correct property class, depreciation system, and convention identified, the actual calculation is straightforward. Factors for calculating MACRS include the asset's cost basis and recovery period, along with the applicable method and convention. The tables handle the math-you supply the basis and look up the percentage.

Four-Step Calculation Process

1. Determine depreciable basis: Start with the asset's purchase price or cost to acquire and place into service. Subtract land (never depreciable), any section 179 deduction elected, bonus depreciation claimed, and personal use portions. The result is the remaining basis subject to MACRS table depreciation.

2. Classify the asset: Assign the correct property class and recovery period using IRS asset class codes from Publication 946 or Revenue Procedures. Decide whether GDS (default) or ADS applies-GDS is the default system for most business property unless ADS is required or elected.

3. Select the appropriate table: Match your depreciation system, recovery period, method, and convention to the correct table. For most personal property, this is Table A-1 (GDS, 200% declining balance, half year convention). If the mid quarter convention applies, use Tables A-2 through A-5 based on the quarter the asset was placed in service. For real property, use mid month convention tables.

4. Multiply basis by annual percentage: For each year of the recovery period, multiply your depreciable basis by the MACRS percentage from the table. The result is that year's depreciation deduction. Track accumulated depreciation to ensure you never exceed total basis.

MACRS adjusts the first and last years of depreciation using conventions like half-year-first-year depreciation under the half-year convention is half a year of depreciation, and the final year captures the remaining half-year. Assets under mid-quarter convention are placed in service mid-quarter, resulting in even finer time-based adjustments.

Property Class Comparison Table

The following table shows GDS depreciation percentages under the half year convention for common property classes, demonstrating how shorter classifications accelerate cost recovery:

*Assumes mid-month convention, placed in service in January.

Under ADS, recovery periods extend further. For example, 5-year GDS property may have a 9- or 12-year ADS class life, and the straight line method produces lower annual depreciation rates. The tradeoff: ADS yields smaller but perfectly even annual deductions, which some taxpayers prefer for accounting method consistency or to reduce future depreciation recapture.

Bonus depreciation allows eligible property to be fully deducted in the first year, effectively bypassing MACRS tables entirely for qualifying assets. The One Big Beautiful Bill Act made 100% bonus depreciation permanent for property acquired after January 19, 2025. Bonus depreciation applies to property acquired after January 19, 2025 with recovery periods of 20 years or less, and can be claimed after section 179 limits are reached. For qualifying property where bonus depreciation is elected, the entire cost is expensed in the first year-no table lookup needed for that portion. The remaining basis (if any) then follows standard MACRS tables.

Real Estate Calculation Examples

Standard approach: A $2 million commercial building (excluding land) placed in service in June uses the 39-year GDS straight-line table with mid month convention. From Table A-7, the first-year MACRS percentage for a June placed in service date is approximately 1.391%, yielding roughly $27,820 in first year depreciation. In later years, the full-year depreciation rate of 2.564% applies, producing approximately $51,280 per year.

With cost segregation: A cost segregation service reclassifies 25% of the $2 million basis ($500,000) into 5-, 7-, and 15-year personal property tables. That $500,000 now uses accelerated depreciation tables-with 5-year property at 20% in year one and 7-year property at 14.29%-while only $1.5 million remains on the 39-year table. The result: substantially higher first-year and cumulative early-year deductions compared to depreciating the entire cost on a single 39-year depreciation schedule.

Bonus depreciation allows accelerated cost recovery for certain assets reclassified through cost segregation, potentially enabling immediate expensing of the entire reclassified portion as an additional deduction beyond standard table depreciation.

Common MACRS Table Mistakes and Solutions

Table errors are among the most common depreciation mistakes, and they compound over every year of an asset's useful life. Correcting them often requires filing Form 3115 (Change in Accounting Method), which adds cost and complexity. Prevention is far more efficient.

Wrong Property Class Selection

The most consequential error is assigning an asset to the wrong property class, which cascades into wrong table selection, wrong depreciation rate, and wrong deduction amounts for every year. Common examples include:

• Misclassifying land improvements as building: Fences, parking lots, and landscaping are 15-year property, not part of a 39-year building. Using the wrong class costs years of deferred deductions.

• Incorrect vehicle classifications: Passenger automobiles classified as listed property face depreciation limits that differ from trucks or vans over 6,000 pounds, which follow standard 5-year property rules.

Solution: Reference IRS asset class codes in Publication 946 and Revenue Procedure 87-56. Maintain detailed asset registers documenting each depreciable asset's classification rationale, placed in service date, and the specific table used. For real estate, consider whether you should pursue a cost segregation study to properly classify building components.

Convention Errors

Convention mistakes alter first-year and final-year depreciation amounts and can affect every asset's depreciation schedule for the entire tax year:

• Failing to apply mid-quarter convention when the 40% test is triggered: Taxpayers must check whether more than 40% of personal property basis was placed in service during the fourth quarter. If so, the mid quarter convention applies to all personal property placed in service that tax year-not just fourth quarter acquisitions.

• Using wrong month for real property: The mid month convention requires identifying the exact month property was placed in service. Using the wrong month shifts the entire depreciation schedule.

Solution: Document the placed in service date for every asset. At year-end, perform the 40% test by comparing final quarter personal property acquisitions against total annual personal property placed in service. Reduce basis by any section 179 amounts when performing this calculation. For real property, verify service month against the month-specific column in the applicable table.

Overlooking Cost Segregation Benefits

Many property owners depreciate their entire building cost using 39-year or 27.5-year tables without analyzing whether components qualify for shorter-life classifications. This means forgoing accelerated deductions that could materially improve cash flow.

Reclassification can accelerate depreciation from 39 years to shorter periods-moving electrical, plumbing, flooring, and other qualifying assets to 5-, 7-, or 15-year tables. Properties with a basis exceeding $500K (excluding land) almost always warrant evaluation. Reviewing cost segregation services can help determine whether a study makes economic sense for your property acquired recently or in prior years.

Solution: Evaluate every commercial or residential rental property above$500K in basis for cost segregation. Even for property already placed in service in prior years, a "look-back" study filed with Form 3115 can capture missed depreciation in a single tax year as a catch-up adjustment.

Conclusion and Next Steps

Proper MACRS table selection is the mechanical foundation of every depreciation deduction-get the property class, convention, or system wrong, and every year's deduction is incorrect. MACRS allows depreciation over specified recovery periods using the declining balance and straight-line methods, and the tables in Publication 946 encode all of these calculations into simple percentages that most taxpayers can apply directly.

Immediate actions to take:

1. Verify that every depreciable asset on your current depreciation schedule is assigned to the correct property class and recovery period

2. Review convention applications-especially the 40% test for mid quarter convention-for the current and prior tax year

3. Document your table selection rationale for each asset class to support IRS Form 4562 filings

4. For real estate holdings, evaluate whether a cost segregation study could reclassify components to shorter-life tables and accelerate deductions

For advanced tax planning, coordinate MACRS table depreciation with section 179 expensing and bonus depreciation to optimize first-year deductions. Multi-year depreciation planning-projecting accumulated depreciation, recapture exposure on disposition, and interaction with farm property or farming business provisions-can further refine your strategy.

Frequently Asked Questions

Where can I find official MACRS depreciation tables?

The IRS provides MACRS tables in Publication 946 to assist in depreciation calculations. Appendix A contains every official table, organized by depreciation system, method, recovery period, and convention. Publication 946 is available free at irs.gov and is updated to reflect current tax year rules. Table A-1 covers most personal property under the half year convention; separate tables exist for mid quarter convention (Tables A-2 through A-5), real property (Tables A-6, A-7, A-7a), and ADS.

What percentage does 7-year property depreciate in the first year?

Under GDS with the half year convention (Table A-1), 7-year property has a first-year depreciation percentage of 14.29%. Under the mid quarter convention, the first year rate varies significantly by quarter: approximately 25.00% for property placed in service in Q1, down to roughly 3.57% for property placed in service in Q4. Under ADS straight line with a 10-year recovery period, first year depreciation would be approximately 5%, reflecting the longer period and even distribution of deductions.

How does cost segregation change MACRS table usage?

Cost segregation reclassifies building components from 39-year nonresidential real property (or 27.5-year residential property) into 5-, 7-, and 15-year personal property classes. This shifts those components from slow straight line real property tables to accelerated declining balance personal property tables. Typically, a study accelerates 20–40% of a commercial building's cost recovery into shorter-life classes, enabling use of Table A-1 percentages (20% first year for 5-year property, 14.29% for 7-year property) instead of 2.564% annual rates on a 39-year schedule. Combined with bonus depreciation for qualifying property, the impact on first year depreciation can be substantial.

When must I use the mid-quarter convention tables?

The mid-quarter convention is required when more than 40% of the total depreciable basis of personal MACRS property placed in service during the tax year is placed in service during the fourth quarter. When this threshold is met, all personal property placed in service that year-regardless of which quarter each asset was acquired-must use the quarter-specific mid-quarter tables. Use Tables A-2 (Q1), A-3 (Q2), A-4 (Q3), and A-5 (Q4) based on each asset's actual placement quarter. Remember to reduce basis for section 179 amounts and exclude real property when performing the 40% test.

Can I elect to use ADS tables instead of GDS?

Yes, taxpayers may elect ADS for any property class at the time of filing their return for the tax year the property is placed in service. ADS uses longer recovery periods and the straight line method, producing even annual deductions rather than the front-loaded pattern of GDS. This election is irrevocable and applies to all property in the same class placed in service that year-you cannot elect ADS for one piece of office furniture while using GDS for another piece in the same class acquired the same year. ADS election may be strategic for taxpayers who expect higher income in later years, want to minimize depreciation recapture on disposition, or need compatibility with other tax provisions like earnings and profits calculations.