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? Request a quote.
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