The tax deductions for a second home depend on how the IRS classifies the property for the year: a home you rarely rent gets the same two write-offs as your primary residence, a home you run as a rental unlocks a full set of business deductions, and a home that falls between those poles requires you to split every expense between personal and rental use. The classification turns on a simple ratio of your personal days to your rental days, and it can shift from one tax year to the next.
How the IRS Classifies Your Second Home
Three categories exist under Section 280A of the Internal Revenue Code, and the IRS walks through them in Topic 415 and Publication 527. Which one applies to you this year depends entirely on how you actually used the property.
Personal-Use Property
If you rent the home for fewer than 15 days during the year, the IRS treats it as a personal residence. You don’t report any of the rental income, but you also can’t deduct any operating expenses tied to the rental activity. Your only write-offs are the same ones available for your primary residence: mortgage interest and property taxes, both claimed on Schedule A if you itemize.
A property also lands in this category if your personal use exceeds the greater of 14 days or 10 percent of the days it was rented at a fair price. A cabin rented for 200 days where you spent 25 days yourself is still personal-use, because 25 exceeds 20 (10 percent of 200).
Full-Time Rental
When your personal use stays at or below 14 days (or 10 percent of total rental days, whichever is greater), the IRS treats the property as a rental business. This opens up the widest set of deductions, reported on Schedule E.
Mixed-Use Vacation Home
The most complicated category kicks in when you rent the home for 15 or more days and your personal use crosses that 14-day or 10-percent line. You report the rental income, but every expense must be split between rental and personal portions, and a hard cap keeps you from generating a rental loss.
What Counts as a Personal-Use Day
Because classification rides on the day count, the IRS defines “personal use” more broadly than most owners expect. Any day you, a family member, or a co-owner’s family member uses the property counts, with one narrow exception: a family member’s stay doesn’t count if that person uses the home as their primary residence, holds no ownership interest, and pays fair market rent.
Renting to anyone at below-market rates also triggers a personal-use day, even if the tenant is a stranger. And if you donate a week at your vacation home to a charity auction, the winning bidder’s stay counts as personal use for purposes of the 14-day threshold.
Days you spend at the property doing nothing but repairs and maintenance don’t count as personal use, but the IRS expects you to be working substantially the entire day. Swapping a lightbulb in the morning and spending the afternoon on the dock won’t pass muster.
Deductions if You Barely Rent It Out
When the home falls into the personal-use category, your deductions are limited to mortgage interest and property taxes, both claimed on Schedule A as itemized deductions. If you take the standard deduction, these expenses produce no tax benefit at all.
Mortgage Interest
Interest on the mortgage is deductible as qualified residence interest, but the total acquisition debt across your primary home and second home combined cannot exceed $750,000 for mortgages taken out after December 15, 2017. Mortgages originating on or before that date follow the older $1 million limit. Interest paid on debt above the applicable cap is not deductible. The $750,000 figure applies to married couples filing jointly; married taxpayers filing separately are limited to $375,000 each.
Property Taxes and the SALT Cap
Property taxes on the second home are deductible as part of the state and local tax (SALT) deduction on Schedule A. For 2026, the SALT cap is approximately $40,400 for most filers, up from $40,000 in 2025 due to a 1-percent annual increase enacted by the One Big Beautiful Bill. Married couples filing separately face roughly half that limit. The cap covers all state and local taxes combined, including income or sales taxes and property taxes on every property you own. If your modified adjusted gross income exceeds roughly $505,000, the cap begins to phase down but won’t drop below $10,000.
That SALT cap is the biggest practical constraint for owners in high-tax areas. If your state income taxes and primary-home property taxes already eat up most of the cap, the second home’s property taxes may produce little or no additional deduction.
What You Cannot Deduct
Utilities, insurance, maintenance, repairs, and similar operating costs are not deductible on a personal-use second home. The IRS treats them as personal living expenses, no different from mowing the lawn at your primary residence.
Deductions if You Run It as a Rental
A second home classified as a full-time rental is treated as a business, and virtually every ordinary cost of running that business is deductible against the rental income on Schedule E.
Operating Expenses
Fully deductible operating costs include insurance premiums, utilities, property management fees, advertising for tenants, lawn care, pest control, and travel to the property for maintenance or tenant-related tasks. Mortgage interest and property taxes are also deducted on Schedule E as business expenses, which means they bypass the SALT cap and the $750,000 mortgage limit that apply to personal-use homes on Schedule A.
Repairs Versus Improvements
A repair that keeps the property in working condition, like fixing a broken water heater or patching a roof leak, is deductible in the year you pay for it. An improvement that adds value or extends the property’s life, like a kitchen renovation or a new roof, must be capitalized and depreciated over time. The IRS scrutinizes this line closely, and misclassifying an improvement as a repair is one of the fastest ways to draw audit attention on a rental return.
For smaller purchases, a de minimis safe harbor lets you expense items costing $2,500 or less per invoice (or $5,000 if you have audited financial statements) without capitalizing them. You elect this safe harbor annually on your tax return. Appliances, window units, and similar items often fall under this threshold.
Depreciation
Depreciation is often the largest single deduction on a rental property because it reduces your taxable income without requiring any cash outlay that year. The IRS requires residential rental property to be depreciated using the straight-line method over 27.5 years. You calculate the annual deduction by subtracting the land value from your total cost basis and dividing by 27.5.
If you bought a rental for $400,000 and the land accounts for $80,000, your depreciable basis is $320,000, producing roughly $11,636 per year in depreciation. You report this on Form 4562, and the result flows to Schedule E. Keep in mind that depreciation reducing your taxable income now gets recaptured when you sell.
Qualified Business Income Deduction
Full-time rentals that rise to the level of a trade or business may qualify for the Section 199A qualified business income (QBI) deduction, which allows you to deduct up to 20 percent of your net rental income. The deduction was extended through 2029 and remains available for 2026 tax returns.
The IRS offers a safe harbor for rentals: if you perform at least 250 hours of rental services per year and keep contemporaneous logs documenting those hours, the property is automatically treated as a qualifying business. Qualifying activities include advertising, tenant screening, lease negotiation, rent collection, repairs, and supervision of contractors. For properties owned less than four years, you need 250 hours every year; for older holdings, 250 hours in at least three of the last five years.
The QBI deduction begins to phase out for single filers with taxable income above roughly $201,750 and joint filers above roughly $403,500 for 2026. Below those thresholds, the full 20 percent deduction is available regardless of the type of business.
Deductions on a Mixed-Use Vacation Home
Mixed-use properties require you to split every expense between a deductible rental portion and a non-deductible personal portion. The math isn’t hard, but the order in which the IRS applies the deductions can cap what you actually write off.
The Basic Allocation Formula
For most operating expenses, the rental percentage equals rental days divided by total days the property was actually used (rental days plus personal-use days). Rent the home for 90 days and use it yourself for 30, and the rental percentage is 75 percent. Apply that percentage to utilities, insurance, repairs, and depreciation to determine the deductible share.
The Bolton Method for Interest and Taxes
Mortgage interest and property taxes are treated differently. In Bolton v. Commissioner, the Tax Court held that because interest and taxes accrue daily regardless of whether anyone occupies the property, they should be allocated using the full 365 days in the year as the denominator rather than just days of actual use. Under this method, if you rented for 90 days, the rental portion of your interest and taxes is 90/365, or about 24.7 percent, rather than 90/120 (75 percent) under the standard formula.
The Bolton method shifts a smaller share of interest and taxes to the rental side, which leaves a larger personal-use portion you can still deduct on Schedule A (subject to the mortgage and SALT limits). The IRS has acquiesced to this approach, and Publication 527 structures its allocation worksheet in a way that accommodates it. The statutory basis is Section 280A(e)(2), which carves out expenses that would be deductible regardless of rental use.
The Ordering Rules and the No-Loss Cap
Section 280A(c)(5) prohibits rental deductions on a mixed-use property from exceeding gross rental income. Your rental expenses can reduce rental income to zero, but they can’t generate a rental loss. The IRS enforces this through a three-tier ordering system laid out in Publication 527’s Worksheet 5-1:
- Tier 1 is the rental portion of mortgage interest, property taxes, and casualty losses. These come off the top of rental income first.
- Tier 2 is the rental portion of operating expenses like utilities, insurance, and repairs. These are deductible only to the extent rental income remains after Tier 1.
- Tier 3 is the rental portion of depreciation. This is deductible only if rental income still remains after Tiers 1 and 2.
If your rental income isn’t enough to absorb all three tiers, the excess carries forward to the following year’s return and faces the same ordering rules again. That carry-forward can stack up for years on a property that consistently produces more expenses than income. The Bolton method helps here by minimizing the Tier 1 amounts charged to the rental side, leaving more room for Tier 2 and Tier 3 deductions.
Short-Term Rentals With Substantial Services
If you rent your second home on platforms like Airbnb or Vrbo and provide substantial services to guests, the IRS may treat the income as business income on Schedule C rather than passive rental income on Schedule E. “Substantial services” means regular cleaning between guests, fresh linens, concierge-type assistance, or daily maid service. A property where you just hand over the keys and leave the guest alone generally stays on Schedule E.
The distinction matters because Schedule C income is subject to self-employment tax (an additional 15.3 percent on net earnings up to the Social Security wage base, and 2.9 percent above that), which Schedule E rental income avoids. Schedule C income isn’t subject to the passive activity loss rules, though, so losses there can offset your other income more freely.
For 2026, short-term rental platforms are required to issue you a Form 1099-K only if your gross payments exceed $20,000 and you have more than 200 transactions during the year. That threshold was reinstated by the One Big Beautiful Bill. Whether or not you receive a 1099-K, all rental income is taxable and must be reported.
Loss Limits That Can Delay Your Deductions
Even when your rental property generates a legitimate tax loss after deducting all expenses and depreciation, the passive activity loss (PAL) rules may prevent you from using that loss to offset wages, business income, or investment gains in the current year. Rental activity is treated as passive by default.
The $25,000 Special Allowance
If you actively participate in managing the property, you can deduct up to $25,000 in rental losses against your non-passive income each year. Active participation means making real management decisions: approving tenants, setting rental terms, authorizing repairs, or hiring contractors. You don’t have to do the day-to-day work yourself, but you do need genuine involvement beyond simply signing checks.
This allowance phases out once your modified adjusted gross income exceeds $100,000, shrinking by $1 for every $2 of income above that threshold. At $150,000 in modified AGI, the allowance disappears.
Real Estate Professional Status
The other way around the PAL rules is qualifying as a real estate professional. This requires spending more than 750 hours per year in real property trades or businesses in which you materially participate, and more than half of your total working hours across all occupations must be in real estate. For most people with full-time jobs outside real estate, the test is essentially impossible to meet. For a spouse who manages multiple rental properties or works in real estate brokerage, it can unlock unlimited loss deductions.
What Happens to Blocked Losses
Losses blocked by the PAL rules aren’t gone. They’re suspended and carried forward indefinitely, available to offset passive income in future years. When you eventually sell the property in a fully taxable transaction, all accumulated suspended losses become deductible at once against any type of income.
The 3.8 Percent Surtax on Rental Income
Rental income may also be subject to the 3.8 percent net investment income tax (NIIT). This surtax applies to the lesser of your net investment income or the amount by which your modified AGI exceeds the applicable threshold: $250,000 for married couples filing jointly, $200,000 for single filers, and $125,000 for married individuals filing separately. These thresholds are not indexed for inflation, so they catch more taxpayers every year. If you qualify as a real estate professional and materially participate in the rental activity, the rental income is excluded from the NIIT calculation.
Records That Support Every Deduction
Every deduction above depends on documentation you can produce if the IRS asks. Keep a usage log showing each day the property was rented, each day you or a family member used it personally, and each day it sat vacant. Note the rental rate charged and whether the tenant was a related party. For the QBI safe harbor, maintain contemporaneous time logs of every rental service activity you performed, including the date, hours, and description of work.
Save receipts for all expenses, and keep records that distinguish repairs (immediately deductible) from improvements (capitalized and depreciated). Photographs of the property’s condition before and after work can help support your classification if it’s ever questioned. If you use the Bolton allocation method for interest and taxes, document the calculation in your files so it’s easy to reconstruct years later.
Most IRS audits of rental properties focus on three things: whether the personal-use day count is accurate, whether repairs were really repairs, and whether the expense allocation percentages are defensible. Solid records resolve all three.