The IRS Taxes You on Depreciation Whether You Claimed It or Not. Here's What That Means for Short-Term Rental Owners.

A story making the rounds this week, reported by 24/7 Wall St., describes a 70-year-old landlord who owned a small rental for decades and never once claimed depreciation. He deducted repairs, mortgage interest, and property taxes every year, but skipped depreciation on the theory that it kept things simple and would mean a smaller tax bill when he eventually sold.

He's now discovering the opposite. When he sells, the IRS will calculate his gain as if he claimed every dollar of depreciation he was entitled to — and tax the recaptured portion at rates up to 25%.

If you own a short-term rental, or you're about to buy one, this story is worth five minutes of your attention. The rule behind it changes how you should think about depreciation entirely.

Depreciation isn't a choice. It's an assumption the IRS makes about you.

The tax code requires depreciation recapture on amounts that were "allowed or allowable." That second word does the damage. Allowable means the depreciation you were entitled to take — whether or not you actually took it.

So when you sell a rental property, your cost basis is reduced by the full depreciation you could have claimed over your holding period. A lower basis means a larger taxable gain, and the portion attributable to depreciation gets recaptured. Skip the deduction and you get the worst of both worlds: no tax benefit during ownership, full recapture bill at sale.

The landlord in the story walked past roughly two decades of deductions — on the order of $7,000 a year on his property — and will be taxed at sale as if he'd banked every one of them.

Why the stakes are higher for short-term rentals

For a traditional long-term rental, missed depreciation accrues at a steady 27.5-year drip. Painful, but gradual.

Short-term rentals compound the problem, because a well-documented STR typically has far more depreciation available in year one. Cost segregation identifies the components of a property — furniture, appliances, flooring, certain fixtures, land improvements like decks, fencing, and landscaping — that carry recovery periods of 20 years or less. Those components qualify for bonus depreciation, and under current law, 100% bonus depreciation is permanently available for qualifying property placed in service after January 19, 2025.

Across the 5,400+ properties we've analyzed, a meaningful share of a typical STR's cost basis sits in those shorter-life components. An STR owner who never separates them out isn't just missing a slow annual deduction — they're missing a large, front-loaded write-off that could have sheltered income in the exact years they owned the property. And the recapture rules don't care either way.

Already own an STR and never did any of this?

You're not stuck, but the sequencing matters — and this is where the landlord in the story still has one good move left.

Form 3115, an application for a change in accounting method, lets a taxpayer catch up missed depreciation in a single current-year adjustment rather than amending years of old returns. Filed properly before a sale closes, it means you finally receive the deductions the IRS was going to tax you on anyway. Filed after the sale, the opportunity is gone.

This is squarely CPA territory — and for STRs with segregated components, parts of the recapture fall under different rules your CPA will walk you through. But before you commission a formal engineered cost segregation study — typically a few thousand dollars — it's worth knowing whether your property has enough short-life value to justify one. That's exactly what our $99 report is built to answer: a property-specific, CPA-grade estimate of your bonus-eligible components and Year-1 write-off, closely calibrated to formal cost segregation studies, that you can hand to your accountant as the starting point for the conversation.

Buying? Know this number before you close.

We built DepreciMax watching too many investment buyers find out their depreciation deduction after closing, when it should've been part of the offer. The story above is the extreme version of the same mistake: treating depreciation as an afterthought instead of a core input to the deal.

Two properties at the same price can carry very different Year-1 write-offs depending on land ratio, component mix, and the state's conformity rules — some states require you to add bonus depreciation back on your state return. Our 2026 study of 197 STR markets exists precisely because that variation is large enough to change which property you should buy.

The landlord in the story learned the rule at the worst possible moment: with a listing agreement in hand. The better time to learn it is before you make the offer — or at minimum, before you sell.

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