How Much Mortgage Interest Can I Deduct in 2025 – The mortgage interest deduction remains one of the most valuable tax breaks for American homeowners in 2025. If you own a home with a mortgage, you may be able to reduce your taxable income by deducting the interest you paid—but only if you itemize deductions and stay within IRS limits. This guide breaks down exactly how much mortgage interest you can deduct in 2025, based on the latest IRS Publication 936 (for 2025 returns) and the One Big Beautiful Bill Act (OBBBA) changes.
Whether you’re a first-time buyer, refinancing, or have a second home, understanding the 2025 rules helps you maximize your savings and avoid surprises when filing in 2026.
Mortgage Interest Deduction Limits for 2025
For tax year 2025, the IRS allows you to deduct home mortgage interest on up to $750,000 of qualified debt ($375,000 if married filing separately). This applies to mortgages taken out after December 15, 2017.
Higher limits apply to older debt:
- $1 million ($500,000 if married filing separately) for home acquisition debt incurred before December 16, 2017 (including grandfathered debt from before October 13, 1987).
- These caps combine all mortgages on your main home and second home.
The One Big Beautiful Bill Act, signed in July 2025, made the $750,000 limit permanent—no reversion to the old $1 million cap after 2025.
Important note: The deduction is not unlimited. If your total mortgage debt exceeds these amounts, you must use the IRS worksheet to calculate the deductible portion (more on that below).
Who Qualifies for the Mortgage Interest Deduction in 2025?
You can claim the deduction only if you:
- Itemize deductions on Schedule A (Form 1040) instead of taking the standard deduction.
- Have a secured debt (mortgage) on a qualified home (your main home or a second home).
- Have an ownership interest in the home.
- Both you and the lender intend for the loan to be repaid.
Qualified home includes houses, condos, co-ops, mobile homes, boats, or similar properties with sleeping, cooking, and toilet facilities. A second home qualifies even if you don’t use it much, as long as it meets the rules (or personal-use tests if rented).
2025 standard deduction reminder (for comparison): $15,750 (single or married filing separately), $31,500 (married filing jointly), or $23,625 (head of household). Many homeowners find itemizing worthwhile only if their total deductions (including mortgage interest, property taxes, etc.) exceed this amount.
What Types of Mortgage Interest Are Deductible?
Only interest on home acquisition debt or certain grandfathered debt qualifies. The loan proceeds must be used to buy, build, or substantially improve the home that secures the loan.
- Points (prepaid interest) may be fully deductible in the year paid if they meet IRS tests (e.g., for your main home purchase).
- Late payment charges and prepayment penalties are generally deductible if not for specific services.
- Refinanced loans qualify up to the original balance.
Interest on debt used for other purposes (e.g., vacations, credit cards) is not deductible as home mortgage interest.
Home Equity Loans and HELOCs: What Changed for 2025?
The TCJA restriction on home equity loans remains in full effect and was made permanent by the OBBBA. You can deduct interest on a home equity loan or HELOC only if the proceeds are used to buy, build, or substantially improve the home that secures the loan.
Personal-use home equity debt (e.g., debt consolidation or vacations) generates nondeductible interest in 2025.
How to Calculate Deductible Mortgage Interest If You Exceed the Limits?
Most homeowners with debt under the caps can deduct all their qualified interest. If your combined mortgages exceed the limits, use the Worksheet to Figure Your Qualified Loan Limit and Deductible Home Mortgage Interest in IRS Publication 936 (Table 1).
Key steps include:
- Calculate average balances for grandfathered debt, pre-2018 acquisition debt, and post-2017 acquisition debt.
- Apply the $1 million / $750,000 limits (reduced by grandfathered debt).
- Multiply total interest paid by the ratio of your qualified loan limit to total mortgage balances.
The worksheet gives you the exact deductible amount to enter on Schedule A.
Lenders report interest on Form 1098. Use this to complete your return accurately.
How to Report Mortgage Interest on Your 2025 Tax Return?
- Report interest reported on Form 1098 on Schedule A, line 8a.
- Other deductible home mortgage interest goes on line 8b.
- Points not on Form 1098 go on line 8c.
Attach a statement if you have multiple borrowers who are not spouses. Reduce your deduction by any mortgage interest credit (Form 8396).
Common Scenarios and Tips for 2025 Homeowners
- Married filing separately: Halved limits ($375,000 or $500,000) apply.
- Co-op apartments: Deduct your share of the co-op’s mortgage interest.
- Construction loans: Up to 24 months of interest may qualify while building.
- Refinancing: Only interest on the refinanced amount up to the prior qualified balance counts.
- Second homes and timeshares: Qualify if they meet the home definition and use tests.
Pro tip: Use the IRS average balance methods (first/last balance or interest-paid method) for accuracy. Keep excellent records of how loan proceeds were used.
Frequently Asked Questions About the 2025 Mortgage Interest Deduction
Can I deduct mortgage interest if I take the standard deduction?
No—you must itemize on Schedule A.
What if my mortgage is over $750,000?
Only the interest on the first $750,000 (or grandfathered higher limit) is deductible.
Is mortgage insurance (PMI/MIP) deductible in 2025?
No—the deduction has expired per IRS Publication 936.
Do I need to file Form 1098?
No—your lender sends it to you (and the IRS) if you paid $600+ in interest.
Maximize Your 2025 Tax Savings: Next Steps
The mortgage interest deduction can save thousands of dollars in 2025 taxes—but only if you qualify and calculate it correctly. Review your Form 1098, run the numbers with the IRS worksheet, and compare itemizing versus the standard deduction.
For personalized advice, consult a tax professional or use IRS Free File tools. Always refer to the official IRS Publication 936 (2025) at IRS.gov for the most current details.
Filing season is coming—start gathering your documents now to make the most of your homeownership tax benefits in 2025!