The ADU Tax Play: Cost Segregation & Depreciation on a Rental Backyard Home
Most people think of a rental ADU as an income play. It's also a tax play — and a surprisingly powerful one. If you rent out a backyard home, the IRS lets you depreciate it, and a strategy called cost segregation can pull years of those deductions forward. Here's the plain-English version. (Always confirm the specifics with your own CPA.)
Depreciation: the deduction most owners underuse
When you rent out property, the IRS treats the building as an asset that wears out over time — and lets you deduct a portion of its value each year against your rental income. On a residential rental, that's normally spread over 27.5 years. It's a real, recurring paper deduction that can shelter much of the rent an ADU earns.
Cost segregation: pulling the deductions forward
Here's where it gets interesting. Not every part of a building has to be depreciated over 27.5 years. A cost-segregation study breaks the property into components — and items like appliances, certain finishes, and site improvements can often be depreciated over 5, 7, or 15 years instead. Front-loading those deductions can mean a much larger write-off in the early years you own the ADU.
You build a rental ADU
A backyard home you rent out is an income-producing asset — the trigger for depreciation.
A study segments the costs
A cost-seg study assigns portions of the build to shorter depreciation schedules.
You accelerate the deductions
More write-off in the early years — potentially offsetting a meaningful chunk of your tax bill while the ADU also collects rent.
Why this pairs so well with an ADU
An ADU is a clean, self-contained asset on land you already own, built new with a clear cost basis — exactly the kind of project a cost-seg study is straightforward to apply to. Add the estimated $1,400–$2,850 a month in rent (see the house-hacking playbook), and you've got income and a tax advantage from the same backyard.
The honest caveat
Tax outcomes depend on your income, how you use the property, and current law — this is a strategy to run past your CPA, not a promise. If you're a CPA or advisor with clients who could use this, that's exactly the kind of introduction our referral partner program is built for. Ready to price the asset? Start with the estimator.
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