First year Airbnb taxes: three numbers your software will get wrong.

A couple with two W-2 incomes closes on a mountain cabin in May, spends six weeks furnishing it, and takes their first booking in late June. In January the Airbnb 1099-K arrives, the payout total in their bank account does not match it, and the tax software asks questions they do not know how to answer. First-year Airbnb taxes are where most of the expensive mistakes on a short-term rental get made, because the first return sets the dates, the depreciation schedule, and the passive loss treatment every later year inherits.

A rental is placed in service when it is ready and available for rent, not when you close and not when the first guest arrives. For an Airbnb that means furnished, photographed, and listed with bookable dates. In this example that is June 15, 2026.

Everything before that date sorts differently. The purchase price and closing costs are basis. Furniture is its own asset. Ordinary operating costs from before the listing went live, such as utilities, supplies, and the listing photographer, are start-up expenditures under §195: you can deduct up to $5,000 in the first year, reduced dollar for dollar once start-up costs pass $50,000, and amortize the rest over 180 months. Most first-year hosts fit under $5,000, so the cost of getting this wrong is usually a timing error. Getting the date wrong costs more, because it also sets the first year of depreciation.

That depreciation is probably not on the schedule the software defaults to. A typical Airbnb with stays of a few nights is not residential rental property, so the building is depreciated over 39 years, not 27.5. The full reasoning is in the 27.5 or 39 years post. Placed in service in June under the mid-month convention, a $410,000 building deducts 1.391% in year one, or $5,703.

Airbnb reports gross earnings in box 1a of Form 1099-K: nightly rates, cleaning fees, and any taxes passed through to you, before its host service fee comes out. Your payouts are smaller. Hosts who enter the payout total as rental income are short by the fee, and the IRS matching program compares your return to the 1099-K, not to your bank statement. The result is a CP2000 notice asking about income you never received, because it went to Airbnb.

The fix is to report the gross on Schedule E and deduct the host fee as an expense. If you did not get a 1099-K at all, because the federal threshold is $20,000 and 200 transactions again for 2026, the income is still taxable and the same gross-then-deduct approach applies.

A $38,745 loss is common in year one, because the furniture deduction lands all at once. Whether it reduces tax on your salaries or sits suspended depends on two tests, and the software asks about neither in a way most hosts understand.

First, the average stay. Under Treas. Reg. §1.469-1T(e)(3)(ii)(A), if guests averaged 7 days or less, the activity is not a rental activity for the passive loss rules, so it is not automatically passive. Compute the average from actual 2026 stays: total nights booked divided by number of bookings. Second, material participation, usually more than 100 hours and more than anyone else, including your cleaner, during the part of the year the cabin was operating. Both are covered in detail in the short-term rental loophole post.

In a partial first year, the hours test is harder than it looks. Six months of turnovers by a cleaning company can easily outrun the owner's hours. Hours spent furnishing and setting up before June 15 may or may not count, and no court has squarely decided it, so I would not build a return around them. Pass both tests and the $38,745 offsets W-2 pay, worth $12,398 at 32%. Fail either and the loss is suspended and carried forward until the cabin produces passive income or you sell it. You do not lose it, but you do not get it this year either.

Pin down the listing date from the Airbnb calendar history and save a screenshot. Pull the 1099-K, or the earnings summary if no form came, and reconcile it to payouts line by line before entering anything. Then decide honestly whether the hours were there, using a log that will hold up, not a reconstruction from memory in March. If they were not, file it as passive and carry the loss. A suspended loss you keep is better than a $12,398 deduction you lose in an exam, plus interest.