Before You Deduct Anything: How the IRS Classifies Your STR

In two decades of reviewing the returns of real estate investors, the most expensive mistake I see STR operators make isn’t on the tax return itself. It’s in the 12 months before they file.

The deductions are there. The tax code is generous to short-term rental operators — more generous than most people realize. But capturing those deductions requires knowing what qualifies, how your specific tax classification affects what you can do with the deductions you take, and what documentation will actually hold up if the IRS decides to look closer.

Most of the tax content written for Airbnb hosts treats deductions like a shopping list. Here’s what you can write off, here’s the category, move on. That’s not how this works in practice. The same expense that generates a real, usable tax benefit for one STR operator generates a suspended passive loss that another operator can’t touch for years. The difference isn’t the expense — it’s the classification of the activity and the tax position the operator has built.

The IRS does not treat all short-term rental income the same way. Your tax classification determines which deductions you can take, whether your losses can offset other income, and which form your income and expenses appear on. Getting clear on your classification is not optional — it’s the foundation everything else sits on.

Schedule E — Passive Rental Activity

This is where most STR operators land. Your rental income and expenses go on Schedule E. The passive activity rules under IRC §469 apply, which means rental losses can only offset other passive income. If you have a high W-2 salary and your STR generates a $30,000 loss in a year with depreciation, that loss doesn’t reduce your W-2 income — it gets suspended and carried forward until you have passive income to offset or you sell the property.

There is a limited exception: if you actively participate in managing your rental property and your adjusted gross income is $100,000 or less, you can deduct up to $25,000 in rental losses against other income. That allowance phases out completely at $150,000 of AGI.

Schedule C — Business Activity with Self-Employment Tax

If you provide substantial services to guests — daily housekeeping, meals, concierge services, guided activities — the IRS treats your STR as a hospitality business rather than a rental activity. Your income and expenses go on Schedule C, and net profit is subject to self-employment tax at 15.3%. Most STR operators do not provide substantial services. Standard turnover cleaning between stays, fresh linens, and basic amenities do not constitute substantial services.

Non-Passive Trade or Business — The STR Loophole Position

This is where the most powerful tax planning lives. When your average rental period is seven days or fewer and you materially participate in the operation of the STR, your activity is not classified as a rental activity under §469. It’s classified as a trade or business — and non-passive losses can offset W-2 income, capital gains, and other ordinary income directly.

This classification doesn’t change what deductions you’re entitled to. It changes what you can do with the losses those deductions generate. If you don’t know your current average rental period, calculate it now: total nights rented divided by total number of separate bookings.

The Operating Deductions Every STR Operator Qualifies For

Regardless of your classification, the following deductions are available to any STR operator running a legitimate rental operation. These are the expenses the IRS explicitly recognizes as ordinary and necessary under IRC §162 and §212, reported on Schedule E or Schedule C.

Mortgage Interest

For most operators with a financed property, mortgage interest is the largest single deduction. The interest portion of your mortgage payment — not the principal — is fully deductible. Your lender will send you Form 1098 at year-end showing total interest paid.

This is also where the most common bookkeeping error occurs. Operators categorize the entire mortgage payment as an expense. Only the interest portion belongs on your P&L. The principal payment reduces your loan balance — it’s a balance sheet transaction, not an income statement expense. Your accounting system needs to split every mortgage payment automatically at the transaction level — the interest to an expense account, the principal to a liability reduction. A chart of accounts that doesn’t make this distinction builds the error into the process from day one.

📘 The STR Chart of Accounts guide covers the correct account structure including automated mortgage payment splitting.

Property Taxes

Real estate taxes on your STR property are fully deductible as a rental expense. This is separate from the SALT deduction on your personal return — rental property taxes are an above-the-line deduction against rental income, not an itemized deduction subject to the SALT cap.

Insurance

Homeowner’s insurance, landlord insurance, and any STR-specific riders or short-term rental coverage are deductible. If you’ve added a vacation rental endorsement to your existing policy, that premium is deductible.

Platform Fees

Airbnb charges a host service fee — typically 3% to 5% of the booking subtotal — deducted from your payout before you ever see the money. That fee is a deductible business expense. The same applies to VRBO fees, direct booking payment processing fees, and any channel manager fees.

One important distinction: Airbnb pays you net of its fee, which means many operators never think to deduct it because it’s already gone. The correct approach is to record gross booking revenue as income and the platform fee as a deductible expense. The numbers net to the same place, but your books accurately reflect the full picture. See the platform payout reconciliation article for the correct bookkeeping treatment.

Cleaning and Maintenance

Turnover cleaning between guests is deductible. Routine maintenance is deductible. The critical distinction is repairs versus improvements. Repairs restore something to its original working condition and are deducted in the year incurred. Improvements add value, extend useful life, or adapt the property to a new use — they must be capitalized and depreciated, not deducted immediately. Replacing a broken dishwasher with a comparable unit is a repair. Upgrading a kitchen with new appliances and countertops is an improvement.

Property Management Fees

Co-host fees, property management company fees, and revenue management service fees are fully deductible — whether structured as a percentage of revenue or a flat monthly fee.

Utilities

Electricity, gas, water, internet, and cable are deductible to the extent they’re used for the rental property. If you never use the property personally, 100% of utility costs are deductible. Streaming services and smart home subscriptions provided for guests are deductible as guest amenities.

Advertising and Marketing

Professional listing photography, paid Airbnb or VRBO promotions, direct booking website hosting fees, and any paid search advertising are deductible.

HOA Fees

Homeowners association dues are fully deductible as a rental expense, including any additional fees the HOA charges for STR registration.

Legal and Professional Fees

CPA fees for rental returns, attorney fees for STR-related legal matters, and cost segregation study fees are deductible in the year paid.

Travel to the Property

Travel for legitimate rental-related purposes — inspections, repairs, contractor meetings, property preparation — is deductible. For vehicle use, you have two options: the standard mileage rate or actual expenses. For 2026, the standard mileage rate is 72.5 cents per mile for miles driven January 1 through June 30 (IRS Notice 2026-10), and — after a rare mid-year increase for rising fuel costs — 76 cents per mile for July 1 through December 31 (Announcement 2026-11, which modified Notice 2026-10). For 2025, the rate was 70 cents per mile. If you drive for the rental on both sides of July 1, log your mileage by date so each half of the year is rated correctly. Whichever method you choose, you must maintain a contemporaneous mileage log — date, destination, purpose, and miles driven, recorded at or near the time of travel.

Supplies

Guest supplies, office supplies, and any materials used for managing the rental business are deductible. Keep receipts.

Depreciation: Where Most STR Operators Leave Money on the Table

Depreciation is the most misunderstood and most underutilized deduction available to STR operators. It’s a non-cash expense — you don’t write a check for it — but it reduces your taxable income the same as any other deduction. For operators in the STR loophole position, depreciation isn’t just a useful deduction. It’s the centerpiece of the entire tax strategy.

Straight-Line Building Depreciation

Residential rental property depreciates over 27.5 years using the straight-line method. Only the building value qualifies — not the land, which never depreciates. If you paid $400,000 for a property and the land is worth $80,000, your depreciable basis is $320,000. Divided over 27.5 years, that’s approximately $11,636 per year in non-cash depreciation deductions. Over five years of ownership, that’s nearly $58,000 in deductions you’re entitled to take whether you use them immediately or not.

Operators who aren’t taking depreciation — or who haven’t confirmed their basis is correct — are leaving money on the table every year.

Personal Property: 5-Year MACRS

Not everything in your STR depreciates over 27.5 years. Furniture, appliances, electronics, and equipment are classified as personal property under MACRS with a 5-year recovery period. Most STR operators incorrectly lump these items into their building basis and depreciate everything at the 27.5-year rate.

That mistake is worth real money. A $25,000 furnishings package on a 5-year schedule generates $5,000 per year in depreciation. On a 27.5-year schedule, the same $25,000 generates less than $1,000 per year.

Bonus Depreciation After the OBBBA

The One Big Beautiful Bill Act, signed July 4, 2025, permanently restored 100% first-year bonus depreciation for qualified property acquired and placed in service after January 19, 2025. This reverses the TCJA phase-down that had reduced bonus depreciation to 60% in 2024 and 40% in the first 19 days of 2025.

Under the restored rules, qualified property — furniture, appliances, electronics, and short-lived building components — can be fully deducted in the year it’s placed in service rather than depreciated over 5 or 7 years.

The acquisition date matters. To qualify for 100% bonus depreciation, property must be both acquired and placed in service after January 19, 2025. Acquisition date is generally the date a written binding contract was signed — not the closing date. Property acquired under a contract signed before January 20, 2025 — even if delivered and placed in service after that date — remains subject to the old phase-down rates. If you’re in this situation, bring your contract dates to your CPA before assuming you qualify for 100%.

See the OBBBA first-year depreciation guide for the full breakdown of how the legislation affects STR depreciation planning.

Cost Segregation

A cost segregation study is an engineering-based analysis that reclassifies components of your building from 27.5-year property to 5-, 7-, or 15-year personal or land improvement property — making them eligible for bonus depreciation. For most properties above $150,000 in value, the first-year tax savings exceed the cost of the study, typically $3,000 to $7,000 for a residential STR.

If you’ve owned your STR for several years without doing a study, a look-back study under Form 3115 (the IRS form for accounting method changes) lets you claim missed depreciation in the current year without amending prior returns. The cost segregation look-back guide covers the mechanics in detail.

The full picture for an operator in the STR loophole position: David is a software engineer earning $230,000 in W-2 income. He owns a beach house with an average rental period of 4.8 days, materially participates by logging 210 hours per year, and qualifies for non-passive treatment. His cost segregation study identifies $90,000 in personal property eligible for 100% bonus depreciation in year one. Combined with his straight-line building depreciation of $12,000, his total first-year depreciation deduction is $102,000. That deduction reduces his taxable income from $230,000 to $128,000. At a 22% to 24% marginal rate, that’s $22,000 to $24,500 in real, immediate tax savings — not a deferred passive loss.

The Personal Use Problem: How Mixed Use Limits Your Deductions

If you use your STR personally for any portion of the year, the rules change significantly.

Under IRC §280A, if you use the property personally for more than 14 days or more than 10% of the days it was rented at fair market price — whichever is greater — the property is classified as a vacation home. Vacation home classification limits your deductions to gross rental income. You cannot deduct a net loss. Expenses must be allocated between rental and personal use days using the IRS Rental Use Ratio.

Rental Use Ratio = Total Rental Days ÷ (Rental Days + Personal Use Days)

One nuance on the allocation itself. The ratio above — rental days over total days used — is the IRS method, and it applies cleanly to operating costs like utilities, cleaning, and insurance. Mortgage interest and property taxes are treated differently by the courts: because you owe them whether or not the property is ever rented, the Tax Court in Bolton and McKinney allowed them to be allocated over the full 365 days (rental days ÷ 365) rather than over days of use — assigning a smaller share to personal use and leaving more of the deduction on the rental side. The IRS has not adopted this position and the circuits have not treated it uniformly, so it is a litigated position rather than a settled rule. If interest and taxes are a large share of your expenses on a mixed-use property, it is worth raising with your CPA.

The jump from just under your threshold to just over it is not marginal. For an operator in the STR loophole position, crossing your threshold can turn a fully usable loss into a suspended passive loss you may not be able to touch for years. Track your personal-use days against the greater of 14 days or 10% of your rental days throughout the year — not at tax time.

For a complete analysis of the personal use rules, see the 14-day personal use boundary guide.

What You Cannot Deduct

Equal in importance to what’s deductible is understanding what isn’t. These are the errors I see most consistently in STR books and on STR tax returns.

Mortgage principal payments. Only the interest portion of your mortgage payment is deductible. The principal reduces your loan balance — it’s a balance sheet transaction, not an operating expense. This is the single most common bookkeeping error I see in STR financials.

Capital improvements in the year incurred. A new roof, a bathroom remodel, a deck addition, a new HVAC system — these are improvements, not repairs. They must be capitalized and depreciated. The IRS tangible property regulations provide a de minimis safe harbor allowing immediate expensing of items costing $2,500 or less per invoice if you have a written policy in place.

Personal use expenses. Expenses attributable to personal use days are not deductible — utilities, supplies, and proportionate fixed costs during those days are personal.

Expenses during non-rental vacancy periods. If your property is taken off the market for a renovation, expenses during that period are generally not deductible as rental expenses.

Club dues and personal memberships. Membership dues for clubs and organizations are generally not deductible as rental expenses even if you discuss rental business matters there.

Documentation: What Survives an Audit

STR operators attract more IRS scrutiny than long-term landlords. High deduction levels relative to income, material participation claims, and cost segregation studies all increase the likelihood of examination. The question isn’t whether your position is correct — it’s whether you can prove it.

Receipts for every expense. Keep receipts categorized and stored by year. A business credit card used exclusively for rental expenses makes this significantly easier.

Mileage log. Every deducted mile needs to be documented with the date, destination, business purpose, and miles driven — recorded at or near the time of travel. A log reconstructed after the fact is technically permitted, but a contemporaneous one makes for a far cleaner, more defensible record.

Booking records. Your booking history documents rental days versus personal use days. Export and save it annually.

Time log for material participation. If you’re claiming material participation, you need a contemporaneous time log documenting your hours by activity throughout the year. I’ve seen operators face audits where their position was entirely correct but undocumentable. Start your log now and maintain it throughout the year.

Separate business accounts. Commingled finances are the first thing an IRS auditor looks for. A dedicated business checking account and credit card for your STR operation — with no personal expenses running through them — is the cleanest structure and the strongest audit defense.

Frequently Asked Questions

What is the most commonly missed STR tax deduction?

Depreciation — specifically the failure to separate personal property (furniture, appliances, electronics) from the building and depreciate them on a 5-year MACRS schedule rather than 27.5 years. The dollar difference is significant and compounds over the life of ownership.

Does passing the 7-day average rental period test change what I can deduct?

No — it changes what you can do with the losses your deductions generate. Operators below the 7-day threshold who also materially participate can use STR losses to offset W-2 income directly. Operators above the threshold generally cannot.

Can I deduct the full cost of furniture I purchased for my STR in 2025 or 2026?

Yes, if the furniture was acquired and placed in service after January 19, 2025, it qualifies for 100% first-year bonus depreciation under the OBBBA. If the purchase contract was signed before January 20, 2025, the old phase-down rates apply.

What happens if I use my STR personally for more than 14 days?

The §280A threshold is the greater of 14 days or 10% of the days you rented at fair market rent, so 14 days is the line only when 10% of your rental days is lower. If your personal use exceeds that greater figure, the property is classified as a vacation home under IRC §280A. Your deductions are capped at gross rental income — you cannot generate a net tax loss. Expenses must be allocated between rental and personal use days using the rental use ratio.

How do I document material participation for the IRS?

Use a contemporaneous time log — records created throughout the year, not reconstructed at year-end. The log should document date, activity, and time spent. The IRS has denied material participation claims where the only evidence was a spreadsheet created during the audit.

Matt Nunn, CPA has been in public accounting since 2006. Builder’s Finance Co publishes financial education content for short-term rental operators. All tax and accounting claims in this article reflect the author’s professional interpretation and should not be relied upon as tax advice for your specific situation. Consult your CPA before making tax elections or strategic decisions.