Property Depreciation MACRS Calculator

Depreciation on buildings is a statutory allowance rather than a measurement of how much value a structure has actually lost. Under the Modified Accelerated Cost Recovery System, real property is written off on a straight line over a recovery period fixed by law: 27.5 years for residential rental property and 39 years for nonresidential real property placed in service after May 12, 1993. Land is excluded entirely because it is not considered to wear out, so the depreciable basis is the acquisition cost plus capitalized closing items such as title fees and transfer taxes, minus the allocated land value. That allocation is usually taken from the county assessor's land-to-improvement ratio or from an appraisal, and a shift of ten percentage points in the split moves the annual deduction materially. The mid-month convention treats property as placed in service at the midpoint of its first month regardless of the actual date, so a full year is never claimed in year one and the write-off runs one year past the nominal recovery period. Two consequences dominate planning. First, the deduction is a timing benefit, not a permanent one: on sale, gain attributable to prior depreciation is unrecaptured Section 1250 gain taxed at up to 25 percent, a rate above the usual long-term capital gains rates, though a Section 1031 like-kind exchange can defer it. Second, cost segregation can reclassify components such as appliances, carpeting, and specialty electrical into 5-, 7-, or 15-year property, often shifting 20 to 40 percent of a building's cost into faster schedules. This calculator models only the plain straight-line building write-off and does not compute recapture, passive activity limits, or the alternative depreciation system periods of 30 and 40 years.

Before any statutory schedule existed, taxpayers estimated useful lives themselves and argued with examiners about them. The Treasury attempted to settle those disputes with Bulletin F, first issued in the 1920s and expanded in its 1942 edition into detailed useful-life tables covering thousands of asset types, with buildings commonly assigned lives of 40 to 60 years. The Asset Depreciation Range system introduced in 1971 replaced open-ended argument with permitted bands around a guideline life, but real estate remained contentious because building lives are long and genuinely uncertain. The modern structure begins with the Economic Recovery Tax Act of 1981, which created the Accelerated Cost Recovery System and allowed real property to be recovered over just 15 years, a deliberately generous provision that helped fuel a wave of tax-motivated real estate syndication. The Tax Reform Act of 1986 reversed course, replacing ACRS with MACRS, requiring straight-line treatment for real property, and lengthening the periods to 27.5 years for residential rental and 31.5 years for nonresidential. The Omnibus Budget Reconciliation Act of 1993 extended the nonresidential period again to the 39 years still in force. The mechanics are set out in Internal Revenue Code section 168 and explained for taxpayers in IRS Publication 946, with rental-specific guidance in Publication 527.