MACRS vs Straight-Line Depreciation: Complete 2026 Guide

Every year, US businesses leave $2.3 billion in tax savings on the table by choosing the wrong depreciation method. This comprehensive guide, written by a practicing ACA with 19 years of experience, explains the mechanics of MACRS and Straight-Line methods with real-world examples and precise calculation tables.

What is MACRS Depreciation?

MACRS (Modified Accelerated Cost Recovery System) is the mandatory depreciation method for US federal income tax purposes, governed by IRS Publication 946. It allows businesses to front-load deductions — recovering more of an asset's cost in early years, reducing taxable income when it matters most.

What is Straight Line Depreciation?

Straight Line (SL) depreciation allocates an equal expense each year over the asset's useful life. Formula: (Cost minus Salvage Value) divided by Useful Life. It is the standard method for financial reporting under IFRS (IAS 16) and US GAAP (ASC 360).

MACRS Property Classes and Conventions

Every business asset falls into a specific IRS recovery class (3, 5, 7, 10, 15, 20, 27.5, or 39 years). Conventions like Half-Year, Mid-Quarter, and Mid-Month determine exactly how much depreciation is allowed in the years an asset is placed in service or disposed of.

Bonus Depreciation and Section 179 in 2026

In 2026, US businesses can further accelerate tax benefits using Section 179 ($1.16M limit) and Bonus Depreciation (20% rate for 2026). Both can be combined with standard MACRS for maximum Year 1 cash flow advantages.

Calculate MACRS Depreciation Instantly

Depreciation Lab supports all MACRS property classes, all three conventions, bonus depreciation, and Section 179. Generate a complete MACRS depreciation schedule in under 60 seconds.

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