Can you write off expenses when flipping a house?
Not the way most people assume. The IRS generally treats a flip as inventory, not a rental — and that changes when your costs actually reduce your tax bill.
This is a place where the bookkeeping and the tax treatment are closely tied, and I want to be direct about which part is mine to answer and which part is your CPA's call. For a flip, the IRS generally treats the property as inventory — you're a dealer, not a long-term investor — and that changes the rules in a way that trips a lot of first-time flippers up.
What that means in practice
Purchase price, closing costs, and rehab costs generally aren't deducted as expenses in the year you pay them. Instead, they get capitalized into the property's basis — treated like inventory or work-in-progress — and only reduce your taxable number when the property actually sells. Profit from a flip is typically taxed as ordinary income rather than capital gains, and if you're doing this repeatedly as a business, self-employment tax can come into play too. Some costs, like certain holding or financing costs, may be treated differently depending on how the deal is structured — that's a real conversation to have with a CPA before you assume anything is or isn't deductible.
Where the books come in
The discipline that actually matters for a flip: treat each property like a job, and track every dollar — purchase price, closing costs, and every rehab invoice — against that specific property in a work-in-progress account, not as a normal monthly operating expense. Nothing hits your P&L as an expense until the property sells. Skip this and you'll get to closing with no idea what your real basis is, which means no idea what you actually made — and a CPA who has to reconstruct a year of receipts to find out.
Get the basis right in the books. Let your CPA make the tax call.
I set books up this way for flippers so that at sale, the numbers are already right instead of needing to be rebuilt. See real estate investor bookkeeping for how that works.
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