Common risk factors that invite scrutiny
The IRS uses automated systems to compare your return against statistical norms for similar taxpayers. Rental property returns with these characteristics are more likely to receive a second look:
Large rental losses claimed against W-2 income. Most passive losses from rentals cannot offset wages — they are suspended until you have passive income or sell the property. A return showing large losses reducing W-2 income suggests either a real estate professional (REPS) claim or an error. REPS claims are specifically flagged for review.
Real estate professional status without documentation. Claiming REPS (more than 750 hours and more than half of personal service hours in real estate trades or businesses) reduces your risk if well-documented. Without a contemporaneous time log, the claim is easily challenged.
Disproportionately large deductions relative to income. If expenses are 90% of gross rents year after year with no explanation, an examiner may look closely at whether all expenses are legitimate and properly allocated.
100% business use of a vehicle claimed on Schedule E. Mileage and vehicle deductions on rental returns are scrutinized. A landlord with one rental property claiming 15,000 business miles is likely to face questions.
Missing rental income. Payment platforms send 1099-K forms to the IRS. If your reported rental income is substantially lower than the 1099-K total from an Airbnb or VRBO platform, the discrepancy triggers a notice.
What the IRS checks and how
IRS examination of a rental return typically focuses on: verifying rental income matches information returns (1099-K); confirming that losses claimed against non-passive income are supported by documented REPS or real estate activity; testing the reasonableness of repair and maintenance expenses (distinguishing repairs from capital improvements); reviewing travel deductions; and verifying the land-versus-building allocation used to compute depreciation.
Audits are often conducted by correspondence — the IRS mails a notice requesting specific documentation. Keeping organized, contemporaneous records means you can typically respond to a correspondence audit without hiring representation.
Best practices for audit defense
Keep receipts for every expense, stored by year and by property. Log your travel (date, property visited, purpose, mileage) when it happens, not months later. Maintain a written record of the land-versus-building allocation you used at purchase. If you claim REPS, keep a detailed time log through the year documenting hours by activity.
Consistent, explainable returns are the strongest defense. A deduction that is the same percentage of income year over year with clear documentation is far less likely to be challenged than a one-year spike without backup. When your return is unusual (a large first-year cost segregation loss, a 1031 exchange, a partial year), attach a note explaining the fact pattern to the return.
Frequently asked questions
Does claiming rental losses increase my audit risk?
Suspended passive losses that carry forward do not draw unusual attention. Large losses actively used against W-2 income through a REPS claim are more likely to be reviewed.
How does the IRS know about my Airbnb income?
Short-term rental platforms issue 1099-K forms to both you and the IRS when payments exceed threshold amounts. The IRS matches these against your return.
What records should I keep to defend a rental audit?
Receipts for all deducted expenses, mileage logs (date, destination, purpose, miles), REPS time logs if applicable, the closing disclosure from purchase (for basis and depreciation), and all prior Forms 4562.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.