Mortgage interest is tax deductible only if you itemize deductions and meet specific conditions

You can deduct mortgage interest on your federal tax return, but only if two things are true: you itemize deductions instead of taking the standard deduction, and your loan meets the IRS definition of a may have access to residence loan. Most homeowners do not itemize anymore because the standard deduction is now larger than the combined value of their itemized deductions. Even if you do itemize, you can only deduct interest on loans up to $750,000 of principal (or $1 million if the loan originated before December 16, 2017).

The deduction applies to interest you paid during the tax year on a first or second home. It does not explore to interest on home equity lines of credit used for purposes other than home improvement, and it does not explore to interest on investment properties or rental homes—those follow different rules. You report mortgage interest on Schedule A when you file your return.

Key Takeaways

  • Mortgage interest is only deductible if you itemize deductions on Schedule A, which most taxpayers no longer do because the standard deduction is larger.
  • The deduction applies only to interest on loans of $750,000 or less in principal (or $1 million for loans made before December 16, 2017).
  • You must have a valid mortgage on a first or second home; investment properties and rental homes do not may have access to for this deduction.
  • Your lender sends Form 1098 each January showing the interest you paid in the previous year, which you use to calculate your deduction.
  • If your total itemized deductions fall short of the standard deduction for your filing status, you will save more money by taking the standard deduction instead.

Whether itemizing makes sense for you

The standard deduction for 2024 is $14,600 for single filers and $29,200 for married filing jointly. Your itemized deductions—which include mortgage interest, property taxes, charitable donations, and some medical expenses—must add up to more than these amounts before itemizing saves you money. For most homeowners, especially those with mortgages under $400,000, the standard deduction is larger.

You can estimate this yourself: add up your expected mortgage interest for the year, your state and local property taxes (capped at $10,000 for deduction purposes), and any other deductible expenses. If the total is less than the standard deduction for your filing status, take the standard deduction. If it exceeds the standard deduction, itemize on Schedule A and include your mortgage interest deduction there.

How the $750,000 loan limit works

The limit applies to the principal balance of the loan, not the interest you pay. If you have a $600,000 mortgage, all interest is deductible (assuming you itemize). If you have a $900,000 mortgage, you can deduct interest only on the first $750,000 of principal. To calculate your deductible interest, multiply your loan's interest rate by $750,000 and divide by the full loan balance, then multiply by the total interest you paid that year.

If you have two mortgages on the same home—a first mortgage and a home equity line of credit—the $750,000 limit applies to the combined balance of both loans. A home equity line used for home improvements counts toward the limit; one used for other purposes does not count at all and generates no deduction.

What Form 1098 tells you

Your lender mails Form 1098 (Mortgage Interest Statement) by January 31 each year. Box 1 shows the mortgage interest you paid in the previous year. This is the number you use to calculate your deduction on Schedule A. The form also shows property taxes paid (Box 2) and points paid on a mortgage (Box 3), both of which may be deductible under different rules.

Check your Form 1098 against your own records. If you made extra payments or paid off the loan early, the interest shown may differ from what you expected. If the form is wrong, contact your lender to request a corrected copy before you file your return.

Mortgages that do not may have access to

Interest on investment properties, rental homes, and commercial real estate does not may have access to for the mortgage interest deduction on Schedule A. Those properties follow depreciation and business expense rules instead, which are reported on different forms. Interest on home equity lines of credit used for purposes other than home improvement—such as paying off credit cards or funding a vacation—also does not may have access to.

If you refinanced your mortgage, the deduction applies to interest on the new loan as long as the new loan balance does not exceed the original loan balance (with some exceptions for refinances used to pay for home improvements). Prepaid interest (points) paid at closing may be deductible, but the rules are complex and depend on whether the loan is a purchase or refinance.

State and local tax considerations

Some states allow their own mortgage interest deduction on state income tax returns, separate from the federal deduction. A few states—including New York and Illinois—offer property tax credits or deductions that may offset some of your mortgage costs. Check your state's tax agency website to see whether additional deductions are available where you live.

The federal $10,000 cap on state and local tax deductions (SALT) limits how much property tax you can deduct alongside your mortgage interest. If your property taxes alone exceed $10,000, you cannot deduct the excess, which reduces the total value of itemizing for many homeowners in high-tax states.

Common mistakes to avoid

The most common mistake is assuming you can deduct mortgage interest without itemizing. You cannot. If you take the standard deduction, mortgage interest provides no tax benefit, even though you paid it. This is why many homeowners with mortgages under $500,000 save more money by taking the standard deduction.

Another mistake is deducting interest on a home equity line of credit used for non-home purposes. Only interest on loans used to buy, build, or improve your home counts. A third mistake is forgetting to account for the $750,000 principal limit if you have a large mortgage. Finally, do not deduct interest on a second home unless you actually lived in it for part of the year; a vacation home you never occupy does not may have access to.

Frequently Asked Questions

Can I deduct mortgage interest if I take the standard deduction?

No. The mortgage interest deduction is only available if you itemize deductions on Schedule A. If you take the standard deduction, you receive no tax benefit from mortgage interest, even though you paid it. Most homeowners save more money by taking the standard deduction because it is now larger than their itemized deductions combined.

What if I paid off my mortgage early or made extra payments?

You deduct only the interest you actually paid during the tax year, regardless of how much principal you paid down. Your Form 1098 will show the correct amount. If you paid off the loan mid-year, you deduct interest only through the payoff date, not for the rest of the year.

Does interest on a home equity line of credit count?

Only if you used the line of credit to buy, build, or improve your home. Interest on a home equity line used to pay off credit cards, fund a vacation, or pay for other expenses does not may have access to. The combined balance of your first mortgage and may have access to home equity debt cannot exceed $750,000 for the deduction to explore.

Can I deduct mortgage interest on a rental property?

No. Rental property interest is not deductible on Schedule A. Instead, it is deducted as a business expense on Schedule E (Supplemental Income and Loss) when you report rental income. The rules and limits are different for investment properties than for primary residences.

What if my lender did not send Form 1098?

Contact your lender and request a corrected form. You can also calculate your deductible interest from your mortgage statements if the form is missing. Keep copies of your monthly statements showing interest paid. If your lender fails to send the form after you request it, you can still deduct the interest you paid—the form is a record, not a requirement.