How Depreciation Works on a House Hack

A straightforward rental is simple: the whole building is a rental, and it's treated as such.

A house hack is not that. You live in part of it and rent out the rest, which means the property has two characters at once — and that's where people get confused.

I am not your CPA. This is general education about how the concept is structured, not advice about your property. The allocation methods, what's allowed, and how it applies to you are genuinely a professional conversation.

The core idea: allocation

Because only the rental portion is being used to produce income, depreciation generally applies to the rental portion, not the whole property.

So the first thing that has to happen is a defensible split between the part you occupy and the part you rent.

There are accepted approaches to arriving at that. The most common concept people encounter is square footage — what share of the property is the rented space — though there are situations where other methods make more sense, particularly when spaces are shared rather than exclusively one or the other.

Shared spaces are exactly where it gets interesting. A kitchen used by everyone isn't purely rental or purely personal, and how that's handled is a real question with real answers that depend on the specifics.

This is the single best reason to talk to a CPA before you rent anything out, rather than after.

What this means practically

Your allocation drives a lot. It affects depreciation, and it typically affects how you split other expenses too — insurance, utilities you cover, property taxes, mortgage interest. One decision, many downstream effects.

It should be documented and consistent. Whatever method you and your CPA land on, you want it written down, supportable, and applied the same way year over year. Changing approaches without reason is a bad look.

Land is still excluded. Same as any rental — value gets allocated between land and building first, and only the building portion is depreciable.

Why records matter more here than in a normal rental

In a standard rental, most expenses are obviously rental expenses. In a house hack, a lot of them are mixed.

That means you're going to need to substantiate how things were split. Which is easy if you did it as you went, and genuinely painful if you're reconstructing a year of receipts in April.

Worth setting up on day one:

• A separate account for property income and expenses where possible
• Receipts kept and categorized as you go
• A written note on your allocation method and the numbers behind it
• Photos or a floor plan showing the rented space, in case you ever need to demonstrate it
• Notes on when spaces changed use — a room that became a rental in June wasn't one in May

None of that takes real time in the moment. All of it is miserable retroactively.

What changes when the split changes

House hacks aren't static. You rent one room, then two. You finish the basement. Someone moves out and you use the space yourself for a while.

Each of those changes the allocation, and the timing matters. A space that converted from personal use to rental use partway through a year isn't the same as one that was rental all year.

Keep a simple log: what space, what use, what dates. It's a two-line note each time and it saves a lot of guessing.

When you move out

This is the big transition, and it deserves its own attention.

The whole property becomes a rental. The allocation that was governing everything goes away, and the treatment changes substantially. There are also considerations around the property's basis at the point of conversion.

It's the single most consequential tax moment in the life of a house hack, and it's one people frequently handle in retrospect. Plan it in advance with your CPA — ideally before you move, not after.

The short version

Depreciation on a house hack generally applies to the rental portion, based on a defensible allocation you establish with a professional and document carefully. That allocation drives much of your tax picture, it changes as your use of the property changes, and it changes completely when you move out.

Set it up correctly at the start, keep clean records, and revisit it whenever the property's use changes.