How to Calculate the Student Loan Interest Deduction

If you’re repaying student loans in the US, part of the interest you pay can reduce your taxable income. The student loan interest deduction is worth up to $2,500 a year, and you don’t need to itemize to claim it. This guide explains who qualifies, how the income phase-out is calculated, and how much tax the deduction actually saves, with a worked example.

This guide is general information, not tax advice. Income limits are adjusted for inflation each year. The figures below are for the 2025 tax year (returns filed in 2026), so check IRS Publication 970 for the year you are filing.

Who can claim the deduction

You can generally claim it if all of these are true:

• You paid interest on a qualified student loan during the year: a loan taken out only to pay qualified higher-education costs for you, your spouse or your dependent.
• You are legally obligated to repay the loan.
• Your filing status is not married filing separately.
• No one else can claim you as a dependent.
• Your modified adjusted gross income (MAGI) is below the upper limit of the phase-out range.

Loans from relatives or from an employer plan generally don’t qualify.

The two limits: $2,500 and the income phase-out

1. The cap: you can deduct the smaller of the interest you paid or $2,500.
2. The phase-out: for 2025, the deduction shrinks when MAGI is between $85,000 and $100,000 (single, head of household or qualifying surviving spouse), or between $170,000 and $200,000 (married filing jointly). Above the top of the range, it is zero.

The phase-out formula

reduction = deduction before phase-out × (MAGI − lower limit) ÷ (upper limit − lower limit)
deduction = deduction before phase-out − reduction

For single filers in 2025, the range is $15,000 wide (85,000 to 100,000). For joint filers, it is $30,000 wide.

Worked example

You’re single, you paid $1,900 of student loan interest this year, and your MAGI is $91,000.

1. Deduction before phase-out: the smaller of $1,900 and $2,500 = $1,900.
2. How far into the phase-out you are: (91,000 − 85,000) ÷ 15,000 = 6,000 ÷ 15,000 = 0.4.
3. Reduction: 1,900 × 0.4 = $760.
4. Deduction: 1,900 − 760 = $1,140.
5. Tax saved: a deduction lowers taxable income, not tax directly. In the 22% bracket, $1,140 × 0.22 = $250.80.

If your MAGI were under $85,000, you’d deduct the full $1,900. Someone who paid $2,500 or more, below the phase-out and in the 22% bracket, saves $550.

A married couple filing jointly

A couple filing jointly paid $2,800 of interest, and their MAGI is $182,000.

1. Cap: the smaller of $2,800 and $2,500 = $2,500. The limit is per return, not per person, so a couple with two borrowers is still capped at $2,500.
2. Phase-out share: (182,000 − 170,000) ÷ 30,000 = 0.4.
3. Reduction: 2,500 × 0.4 = $1,000.
4. Deduction: 2,500 − 1,000 = $1,500, which saves $330 in the 22% bracket.

What counts as student loan interest

• Regular interest payments on qualified loans, federal or private.
• Capitalized interest that you repay. When unpaid interest was added to the balance, the share of later payments that repays it counts as interest.
• Interest on refinanced or consolidated loans, as long as the new loan was used only to refinance qualified student loans.
• Voluntary payments during deferment or a grace period count in the year you make them.

Interest on a loan that was partly for other purposes, or on a credit card used for tuition, generally doesn’t qualify.

How much interest will you pay this year?

The deduction depends on interest actually paid, not interest charged. Early in repayment, most of each payment is interest. For example, a $30,000 loan at 5.5% on a 10-year plan includes about $1,592 of interest in its first year of payments. Use the student loan interest calculator to estimate your daily and yearly interest, and the amortization calculator to see how the interest part shrinks each year.

Where to find the numbers

• Form 1098-E: your servicer sends it if you paid $600 or more of interest. It shows the interest received in box 1.
• Several servicers: add the interest from each 1098-E, or from each statement if you paid under $600 to a servicer.
• MAGI: for most people, this is the adjusted gross income on Form 1040 before the student loan interest deduction itself, with a few foreign-income exclusions added back.

The deduction is reported on Schedule 1 of Form 1040, and tax software applies the phase-out for you.

Claiming the deduction, step by step

1. Collect your 1098-E forms, or download interest statements from each servicer’s website. Servicers usually post them by the end of January.
2. Add the interest paid on all qualified loans during the tax year.
3. Work out your MAGI. For most filers it is your adjusted gross income, figured without this deduction.
4. Apply the $2,500 cap and the phase-out using the formula above, or let tax software do it from the 1098-E figures.
5. Enter the result on Schedule 1 (Form 1040), in the adjustments to income section. It reduces your adjusted gross income directly.
6. Keep your statements with your tax records, in case the IRS asks how you calculated it.

If you forgot to claim the deduction in an earlier year, you can usually still amend that return with Form 1040-X, generally within three years of the original filing date.

Deduction vs. paying the loan off faster

The deduction softens the cost of interest, but it never makes interest worth paying. In the example, $1,900 of interest cost $1,900 and saved $250.80 in tax, a net cost of about $1,649. Paying extra toward principal still saves more overall. The loan payoff calculator shows how much. To work out what share of the interest the deduction recovers, the percentage calculator is handy.

Common mistakes

• Deducting interest that was charged but not paid, for example interest that accrued during deferment and was never paid.
• Including loans that don’t qualify, such as loans from family or loans used for non-education expenses.
• Filing separately while married. That status isn’t eligible.
• Using the wrong year’s income limits. They change with inflation, so check IRS Publication 970.
• Forgetting small servicers. Interest under $600 still counts even without a 1098-E.

Frequently asked questions

How much student loan interest can I deduct?

Up to $2,500 a year of interest you actually paid on qualified student loans. The amount is reduced, and eventually eliminated, once your modified adjusted gross income passes the phase-out range for your filing status.

Do I need to itemize to claim it?

No. It is an adjustment to income, claimed on Schedule 1 of Form 1040, so you can take it along with the standard deduction.

What if I didn't get a Form 1098-E?

Lenders only have to send Form 1098-E if you paid $600 or more of interest. You can still deduct smaller amounts. Find the interest you paid on your loan statements or in your servicer's online account.

Can I claim the deduction if my parents pay my loans?

If you are legally obligated on the loan and no one can claim you as a dependent, the IRS treats payments made by someone else as if you made them, so you can claim the interest. Parents can claim it only if they are legally obligated on the loan.

Can married couples filing separately claim it?

No. Married filing separately is not eligible for the student loan interest deduction.