How to Deduct Interest Paid on Loans – Are you wondering how to deduct interest paid on loans to lower your tax bill? Many US taxpayers can save hundreds or even thousands of dollars by claiming deductions on qualified loan interest. However, not all loans qualify—rules vary by loan type, how you use the proceeds, and your filing status.
This comprehensive guide breaks down the latest IRS rules for tax year 2025 (returns filed in 2026). It focuses on the most common deductible interest types: mortgage, student loans, and the new car loan deduction. Always consult a tax professional or IRS.gov for your specific situation, as this is for informational purposes only.
What Types of Loan Interest Are Tax Deductible in 2025?
The IRS allows deductions for interest on specific loans if you meet strict requirements. Personal loans, credit cards, and most unsecured debt do not qualify. The main categories include:
- Home mortgage interest (including certain home equity loans)
- Student loan interest (above-the-line deduction)
- Qualified car loan interest (new for 2025–2028)
- Business or investment loan interest (subject to limits)
You must generally be legally obligated to pay the interest, and the loan must meet IRS definitions of “qualified” debt.
Mortgage Interest Deduction: Rules, Limits, and Eligibility
The home mortgage interest deduction remains one of the largest tax breaks for homeowners. You can deduct interest paid on a mortgage secured by your main home or a second home, but only if you itemize deductions on Schedule A (Form 1040).
Key Limits for 2025
- Loans taken out after December 15, 2017: Deductible on up to $750,000 of debt ($375,000 if married filing separately).
- Loans taken out before December 16, 2017 (or under a binding contract before that date): Deductible on up to $1 million of debt ($500,000 if married filing separately).
- These limits apply to the combined total of your main and second home mortgages.
Home equity loans and HELOCs qualify only if the proceeds are used to buy, build, or substantially improve the home that secures the loan. Using the money for personal expenses (like vacations or credit card debt) makes the interest nondeductible.
Who Qualifies?
- You must have an ownership interest in the qualified home.
- The mortgage must be a secured debt (recorded against the property).
- Lenders typically send Form 1098 reporting the interest paid.
Use IRS Publication 936 to calculate your exact deductible amount if your loans exceed the limits or mix categories.
Student Loan Interest Deduction: No Itemizing Required
Unlike mortgage interest, the student loan interest deduction is an above-the-line adjustment to income. You don’t need to itemize, and you can claim up to $2,500 (or the actual interest paid, whichever is less).
2025 Income Phase-Out Limits (MAGI)
| Filing Status | Full Deduction | Partial Phase-Out | No Deduction |
|---|---|---|---|
| Single / Head of Household | $85,000 or less | $85,001 – $100,000 | $100,000 or more |
| Married Filing Jointly | $170,000 or less | $170,001 – $200,000 | $200,000 or more |
Qualified loans must be for higher education expenses (tuition, fees, books, etc.) for you, your spouse, or a dependent. The loan cannot be from a relative or employer plan in certain cases. Lenders issue Form 1098-E if you paid $600 or more in interest.
New Car Loan Interest Deduction (2025–2028)
Thanks to the One Big Beautiful Bill Act, a new deduction lets you claim up to $10,000 of interest on qualified passenger vehicle loans for tax years 2025 through 2028. This is available even if you take the standard deduction.
Eligibility Requirements
- Loan originated after December 31, 2024.
- Used to purchase a new qualifying vehicle (car, SUV, truck, van, or motorcycle under 14,000 lbs GVWR).
- Vehicle must have final assembly in the United States.
- Loan must be secured by a first lien on the vehicle.
- Personal use only (not business or commercial).
Phase-out begins at MAGI of $100,000 (single) or $200,000 (joint). This temporary break can significantly help new car buyers.
Business and Investment Loan Interest
- Business loans: Fully deductible as a business expense on Schedule C (sole proprietors) or the appropriate schedule for other entities. The interest must be for business purposes.
- Investment interest: Deductible on Schedule A (line 9) up to your net investment income for the year. Margin loans or loans to buy stocks, bonds, or other investments often qualify here.
Keep detailed records showing how you used the loan proceeds.
How to Claim Loan Interest Deductions on Your 2025 Tax Return?
- Gather documents: Collect Form 1098 (mortgage), 1098-E (student loan), or lender statements.
- Mortgage interest → Enter on Schedule A, lines 8a–8c.
- Student loan interest → Use the Student Loan Interest Deduction Worksheet in IRS Publication 970; report on Form 1040, Schedule 1.
- Car loan interest → Follow IRS guidance for the new qualified passenger vehicle loan interest deduction (details in upcoming instructions).
- File electronically for faster processing and built-in error checks.
Use tax software like TurboTax or consult a CPA to maximize your claim safely.
Common Mistakes to Avoid
- Claiming interest on personal loans or credit cards.
- Deducting home equity interest used for non-home purposes.
- Forgetting phase-out rules for student or car loan deductions.
- Missing Form 1098 reporting requirements.
- Not tracking loan proceeds usage for HELOCs or investment loans.
Double-check Publication 936 (home mortgage) and Publication 970 (education benefits) for your situation.
Frequently Asked Questions About Deducting Interest Paid on Loans
Can I deduct interest on a personal loan?
Generally no—only specific qualified loans qualify.
Do I need to itemize for student loan interest?
No. It’s an above-the-line deduction.
What if my mortgage is over the limit?
Only interest on the first $750,000 (or $1 million for older loans) is deductible.
Are points deductible?
Yes, in many cases—see Publication 936 for rules on mortgage points.
How do I know if my car loan qualifies for the new deduction?
Check the origination date, new vehicle status, US assembly, and lien requirements.
Maximize Your Savings: Next Steps
Understanding how to deduct interest paid on loans can put real money back in your pocket for 2025. Review your loan documents now, gather your 1098 forms, and run the numbers before filing.
For the most accurate guidance, visit IRS.gov and download:
- Publication 936 – Home Mortgage Interest Deduction
- Publication 970 – Tax Benefits for Education
- Latest instructions for the new car loan interest deduction
Tax laws can change, so verify details with a qualified tax advisor or the IRS. Smart planning today means bigger refunds (or smaller balances owed) tomorrow.
Disclaimer: This article is based on IRS publications and official guidance for tax year 2025. It is not tax advice. Rules may vary by individual circumstances.