How to calculate rental property depreciation

Most rental property owners miss out on money every tax season. Let’s talk about how depreciation actually works, why it’s such a powerful tool for real estate investors and how you can run the numbers yourself.

Picture owning your very first house for rent. Rent payments start rolling in, you handle your first leaky faucet, and then tax season sneaks up on you. A buddy who’s been doing this for years brings up “depreciation”.

Maybe you’ve never heard it in this context before. Here’s the gist: The IRS lets you deduct a chunk of your property’s value every year, even if the real estate market says your place is actually gaining value. Feels a little too good to be true, right? But no, it’s completely legit.

Whether you’re renting out a single-family house or eyeing a small apartment building, mastering depreciation can knock thousands off your tax bill, year after year.

What is rental property depreciation?

Depreciation for real estate is the IRS’s way of admitting that buildings get worn down over time. They let you deduct that gradual “wear and tear” as a cost against your rental income, even if your place isn’t losing value in the real world.

The tax office allows you to spread out the cost of a home you rent out over 27.5 years in equal yearly amounts. So you take the cost of the building and spread it out evenly over that period. For commercial buildings, it’s a 39-year recovery, about 2.5% each year. This part matters: Only the building counts for depreciation. Land does not get worn down over time, so it cannot be depreciated.

Steps for figuring out your rental’s depreciation amount

If you want to do a quick and easy overview, you can use a rental property depreciation calculator. You can also do it by yourself, just follow these three steps:

Step 1: Figure out your cost basis. This typically includes the price you paid for it, along with any fees to finalize the sale or big upgrades you did.

Step 2: Take away the worth of the ground it sits on. Since land doesn’t qualify, you have to separate it from the total price. You’ll often find this breakdown on your property tax bill or get it from an appraisal.

Step 3: Divide by 27.5, if it’s residential. That’s your annual depreciation deduction.

Want a quick example? Say you buy a rental for $300,000. Your county says the land is worth $50,000. That leaves you with a $250,000 depreciable basis. Break that up over 27.5 years and you get about $9,090 per year that you can use to offset your rental income, without spending anything more. If you own multiple properties or you’ve made big improvements, a real estate depreciation calculator saves you time and lowers the chance for mistakes.

Using a rental property depreciation calculator

Once you know the basics, a calculator can do the heavy lifting. The best rental property depreciation calculators just ask for your purchase price, land value, when you put the property in service and the type of property. After that, it crunches the numbers for your annual deduction and can model trickier scenarios.

This really comes in handy if you’re adding improvements; a new roof, a remodeled kitchen, a new terrace made by wood from your garden or a new HVAC system, since each one has its own depreciation schedule. A calculator keeps track automatically, so you don’t need a mega spreadsheet or endless calls to your accountant.

Commercial property owners use similar calculators, but they’ll set the depreciation period to 39 years instead. Some calculators even let you break down the numbers further by asset type, which can change your tax deductions a lot.

What is a cost division study and why is it important?

Standard depreciation means your deductions are spread out evenly over 27.5 or 39 years. But a cost segregation study breaks down a property into smaller parts, like flooring, lighting, landscaping and even specialty plumbing, and moves many of them into shorter categories (5, 7 or 15 years).

What happens? Way bigger deductions up front. For example, someone who bought an apartment complex in 2025 with a $5 million improvement basis had a cost segregation study find $1.5 million in assets that can be depreciated even faster.

Because 100% bonus depreciation is back for property bought after January 19, 2025, they wrote off that $1.5 million instantly in year one, resulting in $675,000 in tax savings for someone in a 45% bracket.

The one catch is depreciation recapture

There’s no free lunch with the IRS. Later, if you sell your rental place, the government takes back part of the tax savings you gained from depreciation. This is called depreciation recapture, and you really want to plan for it.

When you’ve used straight-line depreciation, the tax you pay back is limited to 25%; this is known as “unrecaptured Section 1250 gain””. The smart move? Figure recapture into your exit plan right from the start. A depreciation recapture calculator lets you see exactly where you stand when you decide to sell.