House Hacking Taxes: Year 1 vs Year 2+
A house hack is part home, part business, and the tax code treats it exactly that way. Here's the shape of it — and the parts people get wrong.
This is the guide most house hackers skip until April of their first year, and it's the one that quietly returns real money. The core idea is simple: your property is split. The part you live in is a home; the part you rent is a small business. Once you see that split, the rest follows — and a few features of the code, depreciation especially, can turn a positive-cash-flow property into a paper loss on your return.
One honest caveat up front: this is educational, not tax advice. The rules below are the 2026 shape of things, but your situation has details a paragraph can't hold. Run the return with a CPA who has seen a house hack before — it is the cheapest professional you will hire.
Year 1: split everything
In your first year you'll allocate the property between personal and rental use — usually by the number of units or by square footage. In a duplex where you occupy one of two equal units, that's a clean 50/50. Then:
The Year-1 mechanics
- Rental income from the tenant's unit is reported on Schedule E.
- Shared expenses — mortgage interest, property tax, insurance, utilities you pay, repairs to common areas — are split by your allocation. The rental share goes on Schedule E; your personal share (interest and tax) can go on Schedule A if you itemize.
- Rental-only expenses — a repair inside the tenant's unit, advertising, a portion of tools — are fully deductible against rental income.
- Depreciation on the rental portion of the building (never the land) begins — more on this next.
Remember it's a partial year: you start counting from the day the unit is available to rent, not January 1.
Depreciation: the deduction you didn't spend
This is the part people get wrong by ignoring it. You get to deduct a slice of the rental portion's building value every year over 27.5 years — a real deduction for which you write no check. On a $300,000 duplex where, say, $220,000 is building (the rest is land) and half is rental, that's roughly $4,000 a year in depreciation against your rental income. It's often enough to turn a property that cash-flows positively into a paper loss.
Two things to internalize. First, depreciation isn't optional in the way people wish — when you sell, the IRS assumes you took it (\"allowed or allowable\"), so not claiming it costs you twice. Second, that paper loss is passive: it offsets other passive income freely, and if you actively participate and your income is under $100,000, up to $25,000 of it can offset ordinary income (phasing out to $150,000). Above that, the losses aren't lost — they carry forward.
Year 2+ and the day you move out
Most house hackers eventually move — often to do it again. The year you move out, the math shifts:
What changes when you leave
- The whole property becomes a rental. Your depreciation and deductions scale up to 100% of the building — more shelter, but you lose the personal-residence deductions and any homestead property-tax break.
- A clock starts. The primary-residence capital-gains exclusion (Section 121) needs you to have lived there 2 of the last 5 years. Move out, and you have a window before that benefit lapses.
- Bookkeeping gets simpler, ironically — no more personal/rental split, just a straightforward rental on Schedule E.
When you sell: two rules that collide
Selling a former house hack is where the biggest misunderstanding lives. Two rules apply at once:
| Rule | What it does |
|---|---|
| Section 121 exclusion | Excludes up to $250k of gain ($500k married) on the residence portion, if you lived there 2 of the last 5 years. The rental portion's gain generally doesn't qualify. |
| Depreciation recapture | The depreciation you took (or could have) is \"recaptured\" and taxed on sale — up to 25% — regardless of the exclusion. This is why skipping depreciation helps no one. |
In plain terms: living in the building can shield much of your gain from tax, but the depreciation you enjoyed along the way comes back to be taxed when you sell. That's not a reason to avoid depreciation — it deferred and reduced your taxes for years — it's a reason to plan the sale with your CPA, and to consider a 1031 exchange if you're rolling into the next building rather than cashing out.
The honest summary
Year 1, split the property and start depreciation. Year 2+, watch the occupancy clock if you move out. On sale, expect the residence exclusion to help and depreciation recapture to bite. None of it changes whether the deal is good — the cash-flow math decides that. Taxes just decide how much of a good deal you keep, and a house hack, run honestly, lets you keep a surprising amount of it.
