What Are the Tax Benefits on a Second Home Loan?

The main tax benefits on a second home loan come from two deductions: the interest you pay on the mortgage and the property taxes on the home. For 2026, you can deduct interest on up to $750,000 in combined mortgage debt across your primary and second homes, and property taxes count toward a state and local tax deduction capped at $40,400 for most filers.¹² Both require you to itemize, and both are shaped by how you use the property.

Deducting the Mortgage Interest

For any second-home loan taken out after December 15, 2017, interest is deductible on up to $750,000 in total mortgage principal, counting your primary home and second home together. Married filers filing separately share a $375,000 ceiling.¹ The loan must be secured by the home itself. An unsecured personal loan you used to buy a lake house produces no deduction, no matter what the money went toward.

Going over the $750,000 cap doesn’t wipe out the deduction. Interest is deductible on the portion attributable to the first $750,000 of principal. Carry $900,000 in combined mortgage debt and roughly 83% of your interest is still deductible.

Older Loans Get a Higher Ceiling

Mortgages taken out on or before December 15, 2017, are grandfathered at the old cap: $1 million in acquisition debt, or $500,000 if married filing separately.³ Refinancing a grandfathered loan preserves the higher limit, but only up to the balance you had at the time of the refinance. Anything above that balance falls under the newer $750,000 rules.¹

Home Equity Loans and HELOCs

Interest on a home equity loan or line of credit secured by your second home is deductible only when you use the money to buy, build, or substantially improve that same property. Tapping equity in your beach house to pay off credit cards or renovate a different home produces no deduction.¹ The borrowed funds have to flow back into the home securing the loan.

Points Are Deducted Differently

Points paid on a primary-home mortgage can sometimes be deducted in full the year you pay them. On a second-home mortgage, they can’t. Points on a loan for a second home must be spread over the life of the loan and deducted ratably.⁴ On a 30-year mortgage, that’s one-thirtieth per year. Small, easy to forget, but worth claiming.

Property Taxes and the SALT Cap

Property taxes on a second home are deductible as part of the state and local tax deduction. For 2026, the SALT cap is $40,400 for most filers and $20,200 for married individuals filing separately.² That single cap covers property taxes on every home you own plus either your state income tax or state sales tax.

The $40,400 cap phases down once modified adjusted gross income exceeds $505,000, and can shrink back to $10,000 at the top. Owners in high-tax states with two properties often use up the cap on property taxes alone, which effectively erases the state income tax portion of the deduction.

You Only Benefit If You Itemize

Every deduction here lives on Schedule A. For 2026, the standard deduction is $32,200 for married couples filing jointly, $16,100 for single filers, and $24,150 for heads of household.² If your itemized total doesn’t clear those numbers, the second-home deductions produce zero real savings.

Run the arithmetic before you count on the tax break. A married couple paying $14,000 in mortgage interest across both homes and $9,000 in property taxes has about $23,000 in deductions from those two items. That falls short of the $32,200 joint standard deduction. Without meaningful charitable giving or other itemizable expenses, the second-home loan delivers no federal tax savings at all.

What Actually Counts as a Second Home

The property has to have sleeping, cooking, and toilet facilities. A house, a condo, a mobile home, a houseboat, and an RV can all qualify. A bare lot or a storage structure cannot. You get to designate one second home per tax year for mortgage interest purposes.⁵ If you own both a cabin and a cottage, you pick the one that yields the better deduction and treat the other under different tax rules.

If you never rent the home during the year, it automatically qualifies as a residence for the mortgage interest deduction, regardless of how few days you use it.⁵

Renting the Property Changes Everything

Once rental enters the picture, the IRS applies a personal-use test. Your personal use has to exceed the greater of 14 days or 10% of the days the property is rented at fair market rates for it to keep its status as a residence.⁶ Fall below that threshold and the property is treated as a rental. You gain depreciation and expense deductions on Schedule E, but you lose the Schedule A mortgage interest treatment described above.

Personal use is broader than the nights you spend there. A family member’s stay counts unless that relative pays full market rent and uses it as a main home. Home-swap arrangements count. Any day someone stays for less than fair rental value counts.⁶ A week loaned to your cousin at a discount adds seven personal-use days.

When a residence is also rented for more than 14 days, expenses get split between personal and rental portions based on days of each use. Rental deductions are then capped at gross rental income from the property, so you can’t use a vacation home to generate paper losses that shelter other income.⁷

The 14-Day Rental Freebie

Rent the home for fewer than 15 days during the year and you report none of the rental income and deduct none of the rental expenses.⁷ The income is simply not taxed. You still deduct your mortgage interest and property taxes on Schedule A as ordinary residential expenses. For an owner who rents out a house during a local event or a peak weekend, this is one of the cleanest tax breaks in the code.

What It Will Cost You to Sell

The tax benefits on the loan side need to be weighed against the tax bill when you sell. The $250,000 (single) and $500,000 (joint) capital gains exclusion that shelters profit on a primary residence does not apply to a property you’ve used only as a second home. That exclusion requires ownership and use as your principal residence for at least two of the five years before the sale.⁸ A pure second home fails that test, and the full gain is taxable.

Held longer than a year, the gain is taxed at long-term capital gains rates of 0%, 15%, or 20% depending on your income. Higher earners may also owe the 3.8% net investment income tax when modified adjusted gross income exceeds $250,000 (joint) or $200,000 (single).⁹

Capital improvements you make over the years increase your basis and reduce the taxable gain. Adding a deck, replacing a roof, or installing new HVAC counts. Fixing a faucet or repainting doesn’t.¹⁰ Keep receipts from day one. On a home held for a decade or more, the accumulated basis adjustments matter.

1
Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction
2
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
3
Office of the Law Revision Counsel. 26 USC 163 – Interest
4
Internal Revenue Service. Home Mortgage Points
5
Legal Information Institute. 26 U.S. Code 163(h)(4)(A)(i) – Qualified Residence
6
Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
7
Internal Revenue Service. Renting Residential and Vacation Property
8
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
9
Internal Revenue Service. Net Investment Income Tax
10
Internal Revenue Service. Publication 523 – Selling Your Home