How Do I Calculate Depreciation on a Rental Property?

Calculating depreciation on a rental property is one of the most important tasks for any real estate investor. Depreciation reduces your taxable rental income each year, and understanding the calculation ensures you claim every dollar you are entitled to. The IRS requires that you depreciate rental property -- failing to do so does not exempt you from depreciation recapture when you sell.

Step 1: Determine Your Cost Basis

Your cost basis is the starting point for the depreciation calculation. For a purchased property, the basis is the purchase price plus certain closing costs. Costs that are added to basis include title insurance, recording fees, transfer taxes, legal fees for preparing the purchase agreement, and any inspection or survey costs required by the lender. Costs that are not added to basis -- and are instead deducted as expenses or prorated -- include prepaid property taxes, prepaid insurance, and loan origination fees (which are amortized over the loan term).

If you received the property as a gift, your basis is generally the donor's adjusted basis. If you inherited the property, your basis is the fair market value on the date of the decedent's death (the stepped-up basis under IRC Section 1014). These distinctions are critical and directly affect your annual depreciation deduction.

Step 2: Allocate Between Land and Building

Land is not depreciable. You must allocate your total cost basis between the land and the building (improvements). The IRS does not prescribe a specific method for this allocation, but the most commonly accepted approaches are using the property tax assessment ratio, obtaining an independent appraisal, or using the ratio from the closing settlement statement if land and building values are separately stated.

For example, if your county tax assessment shows the land at 20% of total assessed value and the building at 80%, you would apply those percentages to your purchase price. On a $500,000 purchase, the land would be $100,000 (not depreciable) and the building would be $400,000 (your depreciable basis).

Step 3: Apply the Correct Recovery Period and Method

Under the Modified Accelerated Cost Recovery System (MACRS) defined in IRC Section 168, residential rental property is depreciated over 27.5 years using the straight-line method. Nonresidential real property (commercial buildings) uses 39 years, also straight-line. A property qualifies as residential if 80% or more of its gross rental income comes from dwelling units.

The calculation is straightforward: divide the depreciable basis by the recovery period. For a $400,000 residential rental building: $400,000 / 27.5 = $14,545 per year in depreciation expense. This deduction appears on Part III of Schedule E (Form 1040) and reduces your net rental income.

Step 4: Apply the Mid-Month Convention

Rental real property uses the mid-month convention under IRC Section 168(d)(2). This means the property is treated as placed in service in the middle of the month, regardless of the actual closing date. If you close on January 3, you get 11.5 months of depreciation in the first year. If you close on December 28, you get only 0.5 months.

The IRS publishes MACRS percentage tables in IRS Publication 946 (Table A-6 for residential, Table A-7a for nonresidential) that incorporate the mid-month convention. Using these tables ensures your first-year and last-year calculations are accurate. For the $400,000 building placed in service in March, the first-year depreciation would be: $400,000 x 3.182% = $12,728 (representing 9.5 months of depreciation).

Step 5: Account for Improvements and Additions

Capital improvements made after the property is placed in service are depreciated separately. A new roof, HVAC system, or kitchen renovation starts its own 27.5-year depreciation schedule beginning in the month it is placed in service. Each improvement is tracked as a separate asset on your depreciation schedule.

Improvements placed in service after September 27, 2017, may also qualify for cost segregation, where components are reclassified into shorter recovery periods (5, 7, or 15 years) and may be eligible for bonus depreciation under IRC Section 168(k). This can accelerate deductions significantly compared to standard straight-line treatment.

Common Mistakes to Avoid

The most frequent depreciation errors include depreciating land, using the wrong recovery period, failing to account for the mid-month convention in the first and last years, and not depreciating capital improvements separately. Another common mistake is forgetting that depreciation is mandatory -- the IRS will recapture depreciation on sale whether you claimed it or not, so there is no benefit to skipping it. Report depreciation on Form 4562 in the first year and on Schedule E in subsequent years.

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This article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional regarding your specific circumstances. AE Tax Advisors, 935 Lake Elmo Dr, Suite B, Billings, MT 59105. Phone: (631) 614-5762.