What do I need to know about renting my home on Airbnb for tax purposes?

Renting your personal home on a short-term rental platform like Airbnb can have significant tax consequences, and the rules depend heavily on how many days you rent versus how many days you use the property yourself. The IRS uses specific day-count thresholds to classify your rental activity, which then determines what expenses you can deduct and how you must report income. Three common situations each carry their own rules: renting out your entire home, renting out a portion of your home while you continue living there, and renting out an accessory dwelling unit (ADU) on your property. Because dollar thresholds, state rules, and local regulations change, always confirm current figures with official IRS publications and your state tax authority.

Why the number of rental days matters

Before sorting out deductions, the IRS wants to know how the property was used during the year. Two day counts drive the analysis:

Rental days - days a paying guest occupied the property.
Personal use days - days you (or family members, or anyone paying less than fair market rent) used the property.

These counts determine whether your property is treated as a pure rental, a mixed-use vacation home, or still primarily a personal residence. The classification controls how much of your expenses are deductible and where on your return the income and deductions appear.

The 14-day / 10-percent safe harbor (vacation home rules)

If you rent the home for 14 days or fewer during the year, the rental income is generally not taxable and you report nothing from the rental activity - but you also cannot deduct rental expenses. This is sometimes called the "master bedroom exclusion" or the Augusta Rule.

If you rent for more than 14 days, you must report all rental income. The IRS then compares your personal use days to 10 percent of the days the home was rented at fair market value. Exceeding the greater of 14 days or 10 percent of rental days triggers the vacation home expense-limitation rules, which cap deductions so they cannot create a net loss against other income.

Case 1 - Renting your entire home

Many hosts rent their primary residence while they are traveling or temporarily living elsewhere. In this scenario, you vacate the property entirely and a guest occupies the whole home.

Key considerations include:

Income reporting - All rental income is reportable on Schedule E (or Schedule C if you provide substantial hotel-like services) unless the 14-day exclusion applies.
Allocating expenses - When you rent the entire home, you allocate expenses between rental and personal periods based on the ratio of rental days to total days of use during the year. Mortgage interest and property taxes that fall in the personal-use period may still be deductible on Schedule A.
Depreciation - If the property qualifies as a rental, you can depreciate the portion of the home's cost basis attributable to the rental period. Keep records carefully, because depreciation taken (or allowable) reduces your basis and can trigger depreciation recapture when you sell.
Primary residence gain exclusion - Renting your home does not automatically disqualify you from the Section 121 exclusion on a future sale, but periods of non-qualified use (rental use after 2008) can reduce the excludable gain. This is a nuanced calculation worth reviewing with a tax professional before you sell.

Case 2 - Renting a portion of your home while you live there

A common arrangement is renting a spare bedroom, a finished basement, or a separate floor while you continue living in the rest of the house. This is sometimes called a "room rental" or "partial rental."

Allocating expenses between rental and personal space

Because you and your guest share the same structure, you must divide expenses between the rental portion and the personal portion. Two allocation methods are commonly used:

Square footage method - Divide the square footage of the rented space by the total finished square footage of the home. This ratio applies to shared expenses such as utilities, insurance, and mortgage interest.
Number of rooms method - Divide the number of rooms rented by the total number of rooms. The IRS accepts either method as long as it is reasonable and consistently applied.

Handling common areas

Spaces that both you and the guest use - a kitchen, living room, hallway, or bathroom - are considered common areas. The IRS generally allows you to include a proportionate share of common-area square footage in the rental allocation rather than treating it as purely personal. In practice, this means you calculate the guest's dedicated space plus a pro-rata share of common areas, then divide that total by the home's total square footage.

For example, if a guest has exclusive use of a 200-square-foot bedroom and shares a 400-square-foot common area equally with you, you might allocate 200 + 200 = 400 square feet as rental out of a 2,000-square-foot home, yielding a 20 percent rental allocation for shared expenses.

Expenses that are directly attributable to the rental space

Some costs relate only to the rented room - a lock on the bedroom door, a dedicated mini-fridge, or repairs to that room's ceiling. These direct expenses are fully deductible as rental expenses without any allocation calculation.

Ordering rules for deductions when personal use is high

If your personal use days exceed the vacation-home threshold, the IRS requires you to deduct rental expenses in a specific order: (1) mortgage interest and taxes allocable to the rental, (2) operating expenses such as utilities and insurance, and finally (3) depreciation. Deductions in categories 2 and 3 cannot reduce rental income below zero under this regime, and unused amounts generally cannot be carried forward.

Case 3 - Renting an accessory dwelling unit (ADU)

An ADU is a self-contained living unit on the same parcel as your primary residence - a detached backyard cottage, a converted garage apartment, or an attached in-law suite with its own entrance, kitchen, and bathroom. Because an ADU is structurally separate from the main home, the tax analysis differs in important ways.

The ADU as a separate rental property

When an ADU is genuinely a distinct dwelling, the IRS typically treats it as a separate rental property rather than a partial rental of your home. This means:

Rental income and expenses are reported on a separate Schedule E entry (or Schedule C if services are substantial).
You depreciate the ADU's allocable cost basis independently from your main home.
The personal-use day rules apply to the ADU on its own - your personal use of the main house does not count as personal use of the ADU unless you also occupy the ADU yourself.

Shared expenses between the main home and the ADU

Some costs cover the entire parcel - a single water or electric meter, a shared driveway, or a combined homeowner's insurance policy. These shared costs must be allocated between the main home and the ADU, typically by square footage or by metered usage where available. Only the ADU's share is deductible as a rental expense.

Construction and improvement costs

If you built or renovated the ADU, those costs become part of its depreciable basis. Land is never depreciable, so you will need to separate the land value from the structure value, often using the ratio from your property tax assessment or an appraisal. Confirm current depreciation recovery periods and bonus depreciation rules with IRS Publication 527 or a tax advisor, as these figures are subject to change.

ADUs and the primary residence gain exclusion

When you sell the entire property, the Section 121 exclusion applies only to the portion used as your principal residence. The ADU portion - which has been used as a rental - is generally not eligible for the exclusion and may generate taxable gain, including depreciation recapture. Some taxpayers explore whether the ADU qualifies as part of the same "dwelling unit" under state law, but this is a fact-specific question that varies by jurisdiction.

Recordkeeping tips for all three situations

Keep a written log of every rental day and every personal-use day throughout the year.
Save platform statements from Airbnb showing gross receipts, platform fees, and any host-protection payouts separately.
Retain receipts for all repairs, supplies, and improvements, noting which space each expense relates to.
Document your square footage measurements with a floor plan or appraisal so your allocation method is defensible.
Track any depreciation claimed each year, as this affects your basis and future tax liability when you sell.

Short-term rental rules intersect with federal tax law, state income tax, local transient occupancy taxes, and zoning regulations. Readers should verify current thresholds and requirements through IRS Publication 527 (Residential Rental Property), their state department of revenue, and local licensing offices before filing or making business decisions.