7 Tax Deductions Short-Term Rental Owners Routinely Overlook

7 Tax Deductions Short-Term Rental Owners Routinely Overlook

Most short-term rental owners think Airbnb is rental income with extra cleaning fees. The tax code disagrees, and the disagreement is worth real money.

The IRS treats short-term rentals differently from long-term rentals — different enough that the strategies that work for one are wrong for the other. Owners who run their STR like a vacation home pay tax like one. Owners who treat it like a business and document it that way unlock deductions most landlords never see.

Here are seven that get left on the table.

1. The short-term rental loophole that can offset ordinary income

This is the big one, and most owners have never heard the name.

When the average rental period is seven days or less and the owner materially participates in operating the property, the activity is generally not treated as a rental for passive activity purposes under Treas. Reg. §1.469-1T(e)(3)(ii). Translation: losses from the property can offset W-2 or business income, not just other passive income.

That's the gap between "I have a paper loss I can't use" and "I just sheltered $40,000 of my consulting income."

Material participation isn't a vibe — it's seven specific tests under §469. The two that STR owners hit most often: more than 500 hours in the activity for the year, or more than 100 hours and more time than anyone else. Without a time log, none of this is defensible.

2. A cost segregation study that front-loads depreciation

A residential property normally depreciates over 27.5 years. A cost segregation study breaks the building into components and reclassifies the pieces that don't actually last 27.5 years — appliances, flooring, cabinetry, landscaping, certain electrical and plumbing — into 5-, 7-, and 15-year recovery periods.

Property with a recovery period of 20 years or less is eligible for bonus depreciation. Under the One Big Beautiful Bill Act, 100% bonus depreciation was made permanent for qualifying property acquired and placed in service after January 19, 2025 (IRS Notice 2026-11).

On a $600K STR with $480K allocable to the building, a study reclassifying 25% into short-life property — about $120K — can produce a year-one bonus depreciation deduction of that full amount. Paired with the STR loophole above, that deduction can flow against ordinary income. The math gets serious quickly.

3. The de minimis safe harbor on furnishing and setup costs

When you buy a property to put on Airbnb, you spend tens of thousands of dollars on furniture, linens, dishware, decor, smart locks, and the kind of mid-century lamp the listing photos demand.

By default, every item over a certain threshold has to be capitalized and depreciated. Under the de minimis safe harbor election (Treas. Reg. §1.263(a)-1(f)), most STR owners — those without applicable financial statements — can expense items costing $2,500 or less per invoice or per item in the year purchased.

Most furnishing line items fall under that ceiling. The election has to be made on the return each year, and it has to be a written accounting policy in place at the start of the year. Without it, the $80K of furniture goes onto the depreciation schedule. With it, most of it hits this year's return as ordinary expense.

4. The 14-day personal-use line that decides what kind of property you own

Spend more than 14 days personally using your STR (or more than 10% of the days rented, whichever is greater) and IRC §280A reclassifies the property as a residence. That cuts off the loss deduction and limits expenses to the rental income.

Stay at or below the line and the property is generally treated as a business or investment property — full deduction rules apply.

The IRS counts personal use broadly: family members staying at below-market rates count, "maintenance" days you spend there with family count if the work isn't documented, and friends staying for any rate below fair market count.

A simple calendar — who stayed, on what dates, at what rate, with documented repair activity — is the cheapest audit insurance an STR owner can buy.

5. Cleaning, supplies, and platform fees tracked as their own line items

Every Airbnb owner pays cleaners. Every Airbnb owner pays platform fees. Most Airbnb owners track them poorly, because Airbnb's payout statement lumps everything into one net deposit.

OLarry helps STR owners build a chart of accounts that separates platform fees, host service fees, occupancy taxes, cleaning passed through to guests, owner-paid cleaning, and the net rental — so each line on the P&L is its own deductible expense rather than a missing entry inside a black box.

When the books are clean, the deductions are obvious. When the books are a single "Airbnb income" line and a single "expenses" line, the deductions disappear into the noise.

6. Mileage to the property and supplies bought on personal cards

If you drive 90 minutes each way to clean, restock, or meet a contractor at your STR, that's deductible mileage at the IRS standard business rate (72.5 cents per mile for 2026, per IRS Notice 2026-10 setting the rate). Forty trips a year at 180 miles round-trip is 7,200 miles — roughly $5,200 in deductions hiding in your phone's location history.

The same is true for the Costco run with toilet paper, the Target run with sheets, and the hardware store stop for a replacement door knob. If those receipts are on a personal card and never make it into the books, they don't make it onto the return either.

Separate card. Mileage log. Boring habits that fund real deductions.

7. The §179 election for personal property used in the business

Section 179 lets you immediately expense qualifying personal property used in a trade or business. The One Big Beautiful Bill Act permanently raised the cap to $2.5M (with a $4M phase-out threshold), and the inflation-adjusted limit for 2026 is roughly $2.56M, per IRC §179(b) as amended.

For STR owners who qualify for trade-or-business treatment (the same active-operation posture that supports the STR loophole), §179 covers things like a new HVAC system in a rental property, smart-home upgrades, and significant appliances. It pairs with bonus depreciation, sometimes layering favorably on a specific year's stack.

The election isn't automatic. It's a line on the depreciation form, made on the return for the year the property is placed in service. Miss the year, miss the election.

What an STR-literate CPA does that a generalist won't

A generalist treats your Airbnb like a long-term rental and depreciates everything over 27.5 years. The deductions above don't show up in that posture because they don't show up in that worldview.

An STR-literate CPA asks about average stay length first, looks at material participation second, runs the cost segregation math third, and structures the chart of accounts so the deductions can actually be found at year-end.

If your STR generated more cash than your day job last year and your CPA didn't suggest a cost segregation study or ask about your time log, you have the wrong CPA. OLarry works with real estate investors and STR owners on exactly this stack — material participation, cost seg, and the entity and accounting structure that makes the deductions hold. Read what their clients say on Sam's List and book an intro call before your next return.