Mortgage interest deduction reduces your taxable income, not your refund directly
The mortgage interest you pay does not come back to you as a refund. Instead, it lowers the amount of income the IRS taxes you on. If you itemize deductions on your tax return, you can deduct the mortgage interest you paid during the year from your total income. The size of your refund depends on how much tax you owe overall, not on the deduction itself.
Here is the difference: if you paid $8,000 in mortgage interest and you are in the 22% tax bracket, that deduction might reduce your tax bill by around $1,760. But that $1,760 only becomes part of your refund if you overpaid your taxes through withholding or estimated payments during the year. If you underpaid, the deduction simply reduces what you owe.
Key Takeaways
- Mortgage interest is deductible only if you itemize deductions on Schedule A, and only on loans up to $750,000 of principal ($375,000 if married filing separately).
- You must have a valid mortgage secured by a may have access to home to deduct the interest — second homes and investment properties have different rules.
- The deduction appears on Schedule A (Form 1040), and you must choose to itemize rather than take the standard deduction to benefit from it.
- Your actual refund depends on your total tax situation, not on the mortgage interest deduction alone — the deduction only reduces your taxable income.
- Points paid to obtain a mortgage may also be deductible, but the rules vary depending on whether you paid them upfront or rolled them into the loan.
When mortgage interest is deductible and when it is not
You can deduct mortgage interest only if two things are true: you itemize deductions instead of taking the standard deduction, and the loan is secured by a may have access to home. A may have access to home means your primary residence or a second home — not a rental property, not a vacant lot, not a boat or RV (unless it has sleeping, cooking, and bathroom facilities and you live in it part of the year).
The loan itself must be a mortgage or home equity line of credit used to buy, build, or improve the home. Interest on a cash-out refinance is deductible only on the portion of the loan that equals your original mortgage plus improvements. If you refinanced for $300,000 but your original mortgage was $200,000 and you spent $50,000 on improvements, only $250,000 of the new loan qualifies — the extra $50,000 does not.
There is also a cap: you can deduct interest only on the first $750,000 of mortgage principal ($375,000 if you are married filing separately). This limit applies to loans taken out after December 15, 2017. Loans taken out before that date have a $1,000,000 cap.
Itemizing versus the standard deduction
Even if you paid mortgage interest, you only benefit from the deduction if itemizing saves you more money than the standard deduction. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married couples filing jointly. If your mortgage interest plus other deductible expenses (property taxes, charitable donations, state and local taxes up to $10,000) add up to less than the standard deduction, you will not save money by itemizing.
Example: you paid $7,000 in mortgage interest and $3,000 in property taxes. That is $10,000 total. The standard deduction for a single filer is $14,600. You would take the standard deduction instead, and the mortgage interest deduction would not reduce your taxes at all.
If your deductible expenses exceed the standard deduction, you file Schedule A and list the mortgage interest there. The IRS will then subtract that amount from your income before calculating your tax.
How to report mortgage interest on your tax return
Your lender sends you a Form 1098 (Mortgage Interest Statement) by January 31 each year. This form shows the total mortgage interest you paid during the year in Box 1. You do not have to wait for the form to file your return — you can calculate the interest yourself from your mortgage statements — but the 1098 is the official record the IRS expects to see.
If you itemize, you enter the mortgage interest amount from Box 1 of the 1098 on Schedule A, line 8. You then add up all your itemized deductions and compare the total to the standard deduction. If itemizing is worth more, you file Schedule A with your Form 1040. If not, you take the standard deduction and do not file Schedule A.
If you paid points to obtain the mortgage, those may also be deductible. Points paid upfront are usually deductible in full in the year you paid them. Points rolled into the loan are deducted over the life of the loan. Your 1098 will show deductible points in Box 2.
How the deduction affects your refund amount
The mortgage interest deduction lowers your taxable income, which lowers your tax bill. Your refund is what remains after you subtract what you owe from what you already paid through withholding and estimated taxes.
If you earn $80,000 and have $8,000 in mortgage interest, your taxable income drops to $72,000. In the 22% bracket, that saves you about $1,760 in taxes. But that $1,760 only becomes part of your refund if you overpaid your taxes during the year. If your employer withheld $9,000 and you owe $7,240 after the deduction, your refund is $1,760. If your employer withheld $7,000 and you owe $7,240 after the deduction, you owe an additional $240 — no refund at all.
To increase your refund through the mortgage interest deduction, you would need to adjust your withholding with your employer. If you know you will itemize and deduct mortgage interest, you can file a new Form W-4 to have more tax withheld from each paycheck, which would increase your refund when you file.
Mortgage interest on second homes and investment properties
Interest on a second home mortgage is deductible under the same rules as a primary residence — up to $750,000 of principal, only if you itemize, only on a loan secured by the home. The home must be one you own and use for personal purposes at least part of the year.
Interest on a rental property or investment property is not deductible as a personal deduction. Instead, it is deducted as a business expense on Schedule E (Supplemental Income and Loss). The rules are different, and the deduction does not appear on Schedule A.
What to do if you did not receive a Form 1098
If your lender did not send you a 1098 by early February, contact them and ask for it. You can still file your return without it — you can calculate the interest from your mortgage statements — but you should have the 1098 on file for your records.
If you paid off your mortgage during the year, you may receive a 1098 showing only the interest paid before payoff. If you refinanced, you may receive two 1098s — one from the old lender and one from the new lender. Add the interest from both forms if you itemize.
If you believe your 1098 is wrong, contact your lender in writing and ask them to send a corrected form. The IRS receives a copy of your 1098, so discrepancies can trigger a notice later.
Frequently Asked Questions
Can I deduct mortgage interest if I take the standard deduction?
No. The mortgage interest deduction only works if you itemize deductions on Schedule A. If your total itemized deductions are less than the standard deduction, you take the standard deduction and cannot deduct the mortgage interest.
What if I paid points when I bought my house?
Points paid upfront to obtain a mortgage are deductible in the year you paid them, if you itemize. Points rolled into the loan balance are deducted over the life of the loan. Your Form 1098 will show deductible points in Box 2.
Does the mortgage interest deduction increase my refund?
The deduction lowers your tax bill, which can increase your refund if you overpaid taxes during the year. If you underpaid, the deduction simply reduces what you owe. To maximize your refund, adjust your withholding on Form W-4 with your employer.
Can I deduct interest on a home equity line of credit?
Yes, if the line of credit is secured by your home and the money was used to buy, build, or improve the home. Interest on a HELOC used for other purposes is not deductible.
What if I refinanced my mortgage during the year?
You deduct the interest paid on all mortgages during the year, whether you refinanced or not. You may receive two 1098 forms — one from each lender — and you add the interest from both if you itemize.