Real Estate Depreciation

27.5 Years vs. 39 Years: Choosing the Right Recovery Period

The IRS draws a sharp line between residential and commercial real estate. Residential rental property — single-family homes, apartments, duplexes, and multi-unit buildings where at least 80% of gross rents come from dwelling units — uses a 27.5-year straight-line recovery period under MACRS. Commercial real estate such as office buildings, retail strip malls, and warehouses uses a 39-year period. The financial difference is significant: a $500,000 building basis generates $18,182 in annual depreciation under the 27.5-year schedule but only $12,821 under the 39-year schedule — a $5,361 annual gap that compounds to more than $53,000 over a decade.

The classification hinges on use. Mixed-use buildings where retail tenants generate more than 20% of gross income must use the 39-year commercial schedule for the entire structure. Misclassifying a commercial property as residential is a common audit trigger; always document your rental income breakdown.

Separating Land From Building: The Foundation of Your Depreciation Basis

Only the building structure can be depreciated — not the land beneath it, because land does not wear out or become obsolete. When you purchase an investment property, you must allocate the total purchase price between depreciable improvements and non-depreciable land. Three practical methods exist:

• County assessor ratio: Use your property tax statement's assessed land-to-improvement breakdown as a proxy for fair market value. Simple, free, and generally accepted by the IRS.
• Qualified appraisal: Hire a licensed appraiser to separately value land and improvements — the most precise allocation, especially for high-value acquisitions.
• Comparable vacant land sales: Research recent sales of nearby unimproved lots to estimate standalone land value, then subtract to arrive at the building basis.

Urban infill properties typically carry land allocations of 20–40% of purchase price; suburban and rural properties can run much higher. Getting this right matters — over-allocating to the building produces larger deductions but invites IRS scrutiny.

Cost Segregation: Unlocking Shorter Recovery Periods

Cost segregation is an engineering-based tax strategy that reclassifies components of a real estate purchase from 27.5-year or 39-year property into faster-depreciating 5-year, 7-year, or 15-year categories. Parking lots, landscaping, and fencing qualify as 15-year MACRS land improvements. Specialty electrical systems, millwork, and decorative fixtures can become 5- or 7-year personal property. On a $2 million commercial acquisition, a cost segregation study might identify $350,000–$600,000 in reclassifiable assets. Paired with bonus depreciation, those assets can generate enormous first-year deductions. Studies typically cost $5,000–$15,000 but routinely pay for themselves many times over.

The Mid-Month Convention and Strategic Timing

Real property uses the IRS mid-month convention: regardless of the actual closing date, you receive exactly one-half month of depreciation for the month you place the property in service. A property closed December 28 still earns half a month of December depreciation for that tax year — a modest but real benefit for year-end acquisitions. Depreciation begins when the property is ready and available for rent, even if vacant. Pre-renovation periods before the property reaches rent-ready status do not start the clock, though renovation costs add to your depreciable basis once complete. When you eventually sell, all depreciation claimed — or that could have been claimed — is subject to recapture at up to 25% under Section 1250.