Mortgage interest can lower your tax refund, but only if you itemize deductions
Mortgage interest reduces your federal income tax bill, which means it can increase your refund — but only under specific conditions. You have to itemize deductions on your tax return instead of taking the standard deduction. Most people take the standard deduction because it is larger, so most people do not benefit from mortgage interest at all. If you do itemize, the interest you paid on your mortgage during the year goes into the calculation that determines your taxable income, which then determines your refund.
The key number is the standard deduction for your filing status in the year you are filing. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married filing jointly. If your mortgage interest plus other deductions (property taxes, charitable donations, medical expenses) add up to more than that number, itemizing saves you money. If they do not, the standard deduction is better, and mortgage interest does not affect your refund at all.
Key Takeaways
- Mortgage interest only reduces your tax bill if you itemize deductions instead of taking the standard deduction.
- The standard deduction for 2024 is $14,600 for single filers and $29,200 for married filing jointly — your total itemized deductions must exceed this to benefit from mortgage interest.
- You can deduct interest paid on loans up to $750,000 of mortgage principal (or $375,000 if married filing separately).
- Your mortgage lender sends Form 1098 in January showing the interest you paid, which you use when itemizing on Schedule A.
- If you do not itemize, mortgage interest does not change your refund, even though you paid it.
When mortgage interest actually reduces your tax bill
You benefit from mortgage interest only if your total itemized deductions exceed the standard deduction for your filing status. Itemized deductions include mortgage interest, property taxes (capped at $10,000 per year), charitable donations, and certain medical expenses. Add these up. If the total is higher than the standard deduction, you itemize on Schedule A of Form 1040. If the total is lower, you take the standard deduction and mortgage interest does not matter.
Example: You are married filing jointly in 2024. Your mortgage interest was $12,000, your property taxes were $5,000, and you donated $3,000 to charity. Your total itemized deductions are $20,000. The standard deduction for married filing jointly is $29,200. Since $20,000 is less than $29,200, you take the standard deduction. The mortgage interest does not reduce your tax bill. But if your property taxes were $12,000 instead of $5,000, your total would be $32,000, which exceeds $29,200, so you would itemize and the mortgage interest would count.
How much mortgage interest you can deduct
You can deduct interest paid on mortgage debt up to $750,000 of principal if you are married filing jointly, or $375,000 if you are married filing separately. If you are single or head of household, the limit is $750,000. This limit applies to the total of all mortgages on your home — a first mortgage, a second mortgage, or a home equity line of credit all count toward the same cap.
The limit matters only if you have a large mortgage. Most homeowners have less than $750,000 in mortgage debt, so the limit does not affect them. If you do have a larger mortgage, only the interest on the first $750,000 is deductible. Interest on the amount above that is not.
Where to find the mortgage interest you paid
Your mortgage lender sends you Form 1098 by January 31 each year. Box 1 of that form shows the mortgage interest you paid during the year. This is the number you enter on Schedule A if you itemize. You should receive the form in the mail or by email, and you can also log into your lender's website to download it.
If you do not receive Form 1098 by early February, contact your lender. You can also calculate the interest yourself by adding up your monthly mortgage statements, though the lender's number should match. If you paid off your mortgage during the year, the form will show only the interest paid before the payoff date.
How to report mortgage interest on your tax return
If you itemize, you report mortgage interest on Schedule A (Form 1040), which is the form for itemized deductions. Line 8 of Schedule A is for mortgage interest. You enter the amount from Box 1 of Form 1098. You also enter your other deductions on Schedule A — property taxes, charitable donations, and so on. The total of all your itemized deductions goes to Form 1040, where it reduces your taxable income.
If you use tax software, the program will ask whether you want to itemize or take the standard deduction. If you choose to itemize, it will walk you through Schedule A and ask for the mortgage interest amount. If you file by hand, you fill in Schedule A yourself and attach it to Form 1040.
Why most people do not benefit from mortgage interest
The standard deduction has risen significantly in recent years, and it is now high enough that most homeowners benefit more from taking it than from itemizing. In 2024, a married couple would need more than $29,200 in total deductions to make itemizing worthwhile. For many homeowners, mortgage interest alone does not reach that threshold, especially if they live in a state with low property taxes or do not make large charitable donations.
This means that even though you paid mortgage interest, it may not reduce your tax bill at all. That is not a mistake or a loss — it simply means the standard deduction is a better deal for you. The standard deduction is designed to cover basic living expenses, and it applies to everyone regardless of whether they own a home.
What happens if you refinance or pay off your mortgage
If you refinance your mortgage during the year, you will receive two Forms 1098 — one from your old lender showing interest paid before the refinance, and one from your new lender showing interest paid after. Add the amounts from both forms together when you itemize. The total is the interest you deduct.
If you pay off your mortgage completely during the year, Form 1098 will show only the interest paid before the payoff. You deduct only that amount. After you pay off the mortgage, you no longer have mortgage interest to deduct in future years, which may mean you no longer have enough itemized deductions to exceed the standard deduction. Many people who pay off their mortgages switch back to taking the standard deduction.
Frequently Asked Questions
Does mortgage interest increase my refund if I take the standard deduction?
No. Mortgage interest only affects your refund if you itemize deductions. If you take the standard deduction, mortgage interest does not change your tax bill, even though you paid it. You can take the standard deduction or itemize, but not both.
How do I know if I should itemize or take the standard deduction?
Add up your mortgage interest, property taxes, charitable donations, and medical expenses. If the total is higher than the standard deduction for your filing status ($14,600 for single, $29,200 for married filing jointly in 2024), itemize. If it is lower, take the standard deduction. Tax software can calculate both options and show you which is better.
Can I deduct mortgage interest on a second home or investment property?
Yes, mortgage interest on a second home counts toward the $750,000 deduction limit. Interest on a rental property or investment property is handled differently — it is deducted on Schedule E as a business expense, not on Schedule A. The rules are more complex for investment properties.
What if I paid points when I got my mortgage?
Points paid to reduce your interest rate can be deducted, but the rules depend on whether you paid them upfront or rolled them into the loan. Points paid upfront on a purchase are deducted over the life of the loan. Points on a refinance are deducted over the new loan term. Your lender will report this on Form 1098.
Will mortgage interest increase my refund next year?
Only if you itemize and your total itemized deductions exceed the standard deduction. As you pay down your mortgage, the interest portion of your payment decreases, so the amount you can deduct also decreases. After many years, the interest may be too small to make itemizing worthwhile.