Second-Home Mortgage Interest — What's Deductible in 2025

TL;DR: Mortgage interest on a second home is deductible if you itemize on Schedule A, and your combined mortgage debt across your primary home and second home stays under $750,000 (or $1 million if both loans predate December 16, 2017). Rent the second home out for more than 14 days a year without using it yourself for at least 14 days, and it stops counting as a personal residence for this deduction. Most owners with a modest mortgage balance find the standard deduction — $14,600 single or $29,200 married filing jointly in 2024 — beats itemizing anyway.

_Last reviewed: August 2026 · 6 min read_

You bought a second home and now you're wondering if the mortgage interest actually saves you anything on your taxes. The honest answer is: sometimes, and the rules are stricter than most people assume.

Okoniq Property Hub keeps your mortgage statements, interest totals, and property records in one place so tax season isn't a scramble through old PDFs.

What counts as a "second home" for this deduction?

The IRS treats a second home as any residence you own and use personally for at least part of the year, separate from your main home. It doesn't have to be a vacation condo. A cabin, a house in another state, even a boat with sleeping quarters, a bathroom, and a kitchen can qualify.

The catch is personal use. If you rent the property out, you have to use it yourself for more than 14 days a year, or more than 10% of the days you rent it out, whichever is greater. Fall short of that, and the IRS reclassifies it as a rental property, which shifts your interest deduction to Schedule E instead of Schedule A and changes the math entirely.

If you're weighing whether the property should function as a personal getaway or a rental, it's worth reading landlord insurance vs homeowners first, since your insurance classification and your tax classification usually need to line up.

How much mortgage interest can you actually deduct?

You can deduct interest on up to $750,000 of combined mortgage debt across your primary home and second home, if the loans originated after December 15, 2017. If your loans are older than that, the grandfathered limit is $1 million.

This is a combined cap, not a per-property cap. So if you owe $500,000 on your primary home and $400,000 on your second home, you're at $900,000 total, meaning $150,000 of that debt generates no deductible interest. Check your amortization schedule to see how much of your monthly payment is actually interest versus principal, since only the interest portion matters here.

Home equity loans and HELOCs on the second home only qualify if the money was used to buy, build, or substantially improve that home. Borrow against a HELOC to pay off a car or fund a vacation, and that interest isn't deductible no matter how the loan is titled. If you're deciding between a home equity loan vs a HELOC for renovations on the second property, this rule is one more reason to document exactly where the funds went.

Does renting out the second home change the deduction?

Yes, and it can eliminate the personal-residence deduction entirely. If you rent the home more than 14 days a year and don't meet the personal-use threshold, the IRS treats it as a rental property. Your mortgage interest then becomes a rental expense on Schedule E, deductible against rental income rather than as an itemized personal deduction.

| Use Pattern | Tax Treatment | |---|---| | Personal use most of the year, rented ≤14 days | Rental income tax-free, interest still deductible on Schedule A | | Rented >14 days, personal use meets 14-day/10% test | Mixed-use, interest split between Schedule A and E | | Rented >14 days, personal use below threshold | Classified as rental, interest goes to Schedule E |

If you're renting the second home seasonally and want to know what changes on the insurance side too, landlord insurance vs homeowners covers the coverage gaps that show up once rental days climb past that 14-day mark.

Do you need to itemize to claim it?

Yes, and this is the step that trips up most owners. Mortgage interest deduction only applies if you itemize deductions on Schedule A instead of taking the standard deduction. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married couples filing jointly.

Add up your second-home mortgage interest, primary-home mortgage interest, state and local taxes (capped at $10,000), and charitable giving. If that total doesn't clear your standard deduction amount, itemizing gains you nothing and you should just take the standard deduction. A rough rule of thumb: a $400,000 mortgage at 6.5% generates roughly $25,000 in first-year interest, which is often enough on its own to make itemizing worthwhile for married filers once other deductions are added.

Should refinancing the second home change your strategy?

It can, especially if refinancing changes your rate or resets your amortization clock. Refinancing a second home follows the same $750,000/$1 million combined limit, but points paid on a second-home refinance must be deducted over the life of the loan rather than all at once, unlike points on a primary home purchase in some cases. If you're weighing a refinance on the second property, run the numbers with a refinance break-even calculation first, since the interest deduction shift alone rarely justifies refinancing costs by itself.

FAQ

Can I deduct mortgage interest on more than two homes?

No. The mortgage interest deduction for personal residences applies to your primary home plus one additional home you choose to treat as your second home for the tax year. Interest on a third property has to go through rental or business classification instead.

Does the $750,000 limit apply per person or per household?

It applies per household for married couples filing jointly. Married filing separately splits the limit to $375,000 each, which matters if you and your spouse hold mortgages under separate names.

What if my second home has no mortgage at all?

Then there's no mortgage interest to deduct, but you can still deduct property taxes on the second home along with your primary home, subject to the combined $10,000 state and local tax cap.

Is timeshare interest deductible the same way?

Sometimes. If the timeshare deed grants you an ownership interest and the loan is secured by that property, the interest can qualify under the same rules. Many timeshare "loans" are actually unsecured personal loans, which don't qualify.

Do I need to file anything extra to claim second-home interest?

You'll receive Form 1098 from your lender showing interest paid, and you report it on Schedule A along with your primary home's interest. No separate election form is required, but keep records showing personal-use days if you also rent the property.

This is educational information, not tax advice. Talk to a CPA about how these rules apply to your specific mortgage balances and rental activity before filing.