Depreciation is a tax deduction that lets you recover the cost of your rental property over time. The IRS recognizes that buildings wear out, so they allow you to deduct a portion of the property’s value each year against your rental income. The result is lower taxable income without any cash leaving your pocket. For rental property investors, it is often the single biggest tax benefit of owning real estate.

Residential rental property gets depreciated over 27.5 years using the straight-line method. That means you divide the depreciable value by 27.5 and deduct that amount every year. A property with a depreciable value of $275,000 gives you a $10,000 annual deduction. That is real money off your tax bill, especially if you own multiple properties.

The important detail is that you only depreciate the building, not the land. Land doesn’t wear out, so the IRS won’t let you deduct it. When you buy a rental property for $350,000, you need to allocate a portion to land and the remainder to the building. Most owners use the county tax assessment ratio to split the two, though an appraisal works too. Getting this allocation right matters because a higher building value means a larger annual deduction.

Depreciation begins when the property is placed in service, meaning it’s ready and available for rent. Not when you close on the purchase, and not when the first tenant moves in. If you buy a property in October and list it for rent in November, depreciation starts in November. In the first and last years, you only get a partial year’s deduction based on a mid-month convention.

Improvements you make to the property are depreciated separately. A new roof, a kitchen renovation, or a replaced HVAC system each get their own depreciation schedule. Some improvements follow the 27.5-year residential schedule. Others, like appliances, landscaping, or fencing, can qualify for shorter recovery periods of 5, 7, or 15 years. A cost segregation study can identify components of your property that qualify for these accelerated schedules, which front-loads your deductions into earlier years.

One thing that catches many property owners off guard is that the IRS requires you to take depreciation whether you actually claim it or not. When you eventually sell the property, the IRS calculates depreciation recapture based on what you should have deducted, not what you did deduct. So skipping depreciation doesn’t save you from recapture tax. It just means you missed years of deductions for nothing. Depreciation recapture is taxed at up to 25% on the gain attributable to the depreciation you took or should have taken.

When you sell, a 1031 exchange can defer both capital gains and depreciation recapture by rolling the proceeds into another investment property. This is a common strategy for investors who want to keep building their portfolio without triggering a large tax event.

Tracking all of this properly requires accurate records from the day you acquire each property. Purchase price allocation, improvement costs, dates placed in service, and depreciation schedules all need to be documented and maintained year over year. If your bookkeeping services aren’t capturing this detail, your tax returns are either leaving deductions on the table or setting you up for problems when you sell. Getting it right from the start is far easier than trying to reconstruct years of depreciation history after the fact.