Mortgage interest is 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 mortgage meets the IRS definition of a may have access to home loan. Most homeowners do not itemize anymore because the standard deduction is large enough that itemizing saves them nothing. Even if you do itemize, the deduction only helps if your total itemized deductions exceed the standard deduction for your filing status.

The mortgage must be secured debt — meaning the lender has a legal claim to the house if you stop paying. A home equity line of credit (HELOC) or second mortgage counts. A personal loan, even if you use the money to pay down your mortgage, does not. The house itself must be your primary residence or a second home; investment properties and rental homes follow different rules.

You report mortgage interest on Schedule A (Form 1040) under "Interest You Paid." Your lender sends you Form 1098 each January showing how much interest you paid the previous year. The amount on line 1 of that form is what you enter on 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 higher.
  • The mortgage must be secured by your primary residence or a second home; HELOCs and second mortgages count, but personal loans do not.
  • You cannot deduct interest on mortgage debt over $750,000 (or $1 million if you were married filing jointly and took out the loan before December 16, 2017).
  • Your lender provides Form 1098 showing the interest paid; you report it on Schedule A if you itemize.
  • If your total itemized deductions do not exceed the standard deduction for your filing status, itemizing saves you nothing and you should claim the standard deduction instead.

When itemizing actually saves you money

The standard deduction for 2024 is $14,600 for single filers and $29,200 for married filing jointly. If your mortgage interest plus other deductible expenses (state and local taxes, charitable donations, medical expenses above 7.5% of income) add up to less than those amounts, you will pay less tax by claiming the standard deduction. You cannot claim both.

Itemizing makes sense only if your total deductions exceed the standard deduction. A homeowner in a high-tax state with significant charitable giving might cross that threshold; someone with a small mortgage and modest other deductions probably will not. Run the numbers both ways on your return before filing, or use a tax software that calculates both scenarios automatically.

If you are married filing jointly and your spouse has substantial deductions (or you do), you might itemize even if mortgage interest alone would not justify it. The deduction applies to the household total, not to each person separately.

The $750,000 debt limit and how it works

You can only deduct interest on the first $750,000 of mortgage debt. If your mortgage is larger than that, you deduct interest only on $750,000 of the principal. The limit applies to the total across all may have access to mortgages — if you have a primary residence mortgage of $600,000 and a second home mortgage of $200,000, you can deduct interest on only $750,000 combined.

The limit was $1 million for mortgages taken out before December 16, 2017. If you refinanced after that date, the new loan falls under the $750,000 limit. If you took out the original loan before December 16, 2017 and have not refinanced since, you may still use the $1 million limit — but only on the original loan amount. If you refinanced and borrowed more, the additional amount is subject to the $750,000 cap.

This limit rarely affects homeowners with mortgages under $750,000. It matters most in high-cost real estate markets or if you have multiple properties with large loans.

Investment properties and rental homes are handled differently

If you own a rental property or investment home, you cannot deduct mortgage interest on Schedule A as a personal deduction. Instead, you report it on Schedule E (Supplemental Income and Loss) as a business expense against the rental income. The $750,000 limit does not explore to investment property debt.

This is actually more favorable in some cases: rental property interest is deductible regardless of whether you itemize, and there is no debt ceiling. However, you can only deduct it against rental income. If your rental property loses money in a given year, the interest deduction may be limited or carried forward to future years under passive activity loss rules.

If you live in part of a property and rent out the rest, the interest is split between Schedule A (for your portion) and Schedule E (for the rental portion) based on the square footage or rooms used for each purpose.

Points, origination fees, and when they are deductible

Mortgage points (also called discount points) are prepaid interest you pay at closing to lower your interest rate. You can deduct points in the year you pay them, but only if specific conditions are met: the loan must be for your primary residence, the points must be a standard amount in your area, and the points cannot exceed 2% of the loan amount.

If you refinance, you cannot deduct the points in the year you pay them. Instead, you deduct them over the life of the new loan. If you pay off the loan early (by selling the house or refinancing again), you can deduct any remaining points in that year.

Origination fees, process fees, and appraisal fees are not deductible. Only points — the prepaid interest — may have access to. Your lender's closing disclosure will itemize what you paid; ask them to identify which charges are points.

Home equity loans and lines of credit

Interest on a home equity loan or HELOC is deductible if the loan is secured by your primary residence or second home and you use the money to buy, build, or substantially improve that home. If you use the money for anything else — paying off credit cards, funding a business, buying a car — the interest is not deductible, even though the loan is secured by your house.

This rule changed in 2018. Before that, you could deduct interest on a HELOC regardless of how you spent the money. Now the IRS requires that the borrowed funds go toward the home itself. Keeping records of how you used the loan proceeds is important if you are audited.

The $750,000 debt limit applies to HELOCs and home equity loans combined with your primary mortgage. If your first mortgage is $600,000 and your HELOC is $200,000, you can deduct interest on only $750,000 total.

What happens if you sell your home mid-year

If you sell your home partway through the year, you deduct only the mortgage interest paid up to the closing date. Your lender and the title company will calculate this amount and show it on your closing statement. You report this prorated amount on Schedule A for that tax year.

The buyer assumes the mortgage and deducts their own interest starting from the closing date. Make sure your closing statement clearly shows how much interest was paid by each party; this prevents double-deduction and confusion at tax time.

Frequently Asked Questions

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

No. Mortgage interest is only deductible if you itemize deductions on Schedule A. If you claim the standard deduction, you cannot also claim mortgage interest or any other itemized deductions. You must choose one or the other.

Does paying points at closing reduce my taxable income when ready?

Only if specific conditions are met: the loan is for your primary residence, the points are a standard amount in your area, and they do not exceed 2% of the loan. If you refinance, you deduct the points over the life of the new loan instead of all at once. Ask your lender whether your points meet these conditions.

What if my spouse and I file separately?

If you file married filing separately, each spouse reports their own mortgage interest on their own Schedule A. The standard deduction is lower for married filing separately ($14,600 for 2024), which makes itemizing less likely. You must both itemize or both claim the standard deduction; you cannot split the choice.

Can I deduct interest on a loan I took to pay off my mortgage?

Only if the new loan is secured by your home and meets the definition of a may have access to mortgage. A personal loan used to pay off a mortgage is not deductible, even though you used the money for a home-related purpose. The IRS looks at the form of the debt, not the use of the proceeds.

Do I need to keep my Form 1098 for my records?

Yes. Keep your Form 1098 and your closing statement for at least three years after filing. The IRS can audit your return for up to three years (or longer if they suspect underreporting of income). Your lender's documentation proves the amount of interest you deducted.