United States

Student Loan Interest Deduction Calculator

Legal basis: IRC §221 (student loan interest deduction); IRC §221(b) and §221(e) (modified adjusted gross income and phase-out ranges); Form 1040 Schedule 1 · checked 2026-10-04 · Rates and limits change — verify the current figures.

Interest you pay on a qualified student loan can reduce your taxable income even if you take the standard deduction. IRC §221 allows a deduction for student loan interest, and because it is an above-the-line adjustment claimed on Schedule 1 — not an itemized deduction — it is available to every eligible filer regardless of whether they itemize. Only interest, not principal, counts, and only up to a cap set by law: $2,500 per year in recent years, regardless of how many loans or how much interest you actually paid.

Eligibility has three gates. First, the loan must be a qualified student loan — borrowed for you, your spouse, or a dependent to pay qualified higher-education expenses at an eligible institution, not borrowed from a relative or a plan like a 401(k). Second, you cannot be claimed as a dependent by someone else. Third, your filing status cannot be married filing separately, which is disallowed entirely — a fact that surprises many couples.

The deduction phases out by income. Your modified adjusted gross income (MAGI — essentially AGI with certain exclusions added back) is compared against a phase-out range: below the bottom of the range the deduction is unaffected, above the top it is zero, and in between it shrinks proportionally until it disappears. The range is roughly twice as wide for joint filers as for singles, and the amounts are indexed and change with legislation, so the current-year figures in the Form 1040 instructions are the ones that matter.

This calculator takes the interest you paid, your MAGI, and the current cap and phase-out range, then shows the surviving deduction and the portion lost to the phase-out. Enter the current-year figures rather than numbers from memory, and treat the result as an educational estimate, not tax advice, to confirm with the IRS instructions or a CPA.

Calculate

Student loan interest paid

Box 1 of the Form 1098-E you receive from your loan servicer each year.

Modified adjusted gross income

Roughly your AGI with certain amounts added back; see the Form 1040 instructions.

Filing status

Married filing separately is never eligible for this deduction.

Annual interest cap

$2,500 in recent years, set by law — verify the current-year figure.

Phase-out start (single)

MAGI where the phase-out begins for non-joint filers. Joint is treated as double — verify current-year amounts.

Phase-out end (single)

MAGI where the deduction reaches zero for non-joint filers. Joint is treated as double.

Student loan interest deductionreduced by the MAGI phase-out$1,600

Interest counted before phase-outall interest paid counts, under the cap$2,400

Amount lost to the phase-outMAGI of $90,000 inside the $85,000–$100,000 range$800

Phase-out range appliedsingle range entered$85,000 – $100,000

Deduction surviving per $100 of MAGIhow fast the deduction melts away inside the range$16.00

Approximate tax savedat an illustrative 22% marginal rate$352

How the math works

Start with the smaller of the interest you paid or the annual cap (IRC §221(b)(2)).
If MAGI is within the phase-out range, multiply that amount by (top of range − MAGI) ÷ (top − bottom).
Below the bottom of the range the full capped amount deducts; above the top, the deduction is zero.
The deduction is an adjustment to income on Schedule 1 — available even if you take the standard deduction.

Frequently asked questions

How much student loan interest can I deduct?

Up to the annual cap set by IRC §221 — $2,500 in recent years — no matter how many loans you are repaying or how much interest you paid. Interest paid by someone else on your behalf, such as a parent on a loan you are obligated on, can also count under special rules.

Is the student loan interest deduction above the line?

Yes. It is an adjustment to income on Form 1040 Schedule 1, so you get it even if you claim the standard deduction and itemize nothing else. You do not need Schedule A.

What is the MAGI phase-out?

The deduction shrinks as your modified adjusted gross income climbs through a range — roughly $85,000–$100,000 for non-joint filers and double that for joint filers in recent years, with the amounts indexed. Below the range the full capped amount deducts; above it, nothing.

Can married couples both deduct student loan interest?

If you file jointly, the $2,500 cap is per return, not per person, and each spouse's MAGI is combined for the phase-out. Married filing separately is never eligible, which can make filing jointly — or not — a real calculation.

Which loans qualify?

Qualified student loans taken to pay qualified higher-education expenses — tuition, fees, books, room and board — at an eligible institution, for you, your spouse, or a dependent. Loans from a related person, from a qualified employer plan like a 401(k), or purely for non-qualified expenses do not count.

Do I need the Form 1098-E?

Your loan servicer issues a Form 1098-E if you paid $600 or more in interest, reporting the interest in box 1. Servicers do not always send it under $600, but interest below that threshold is still deductible if you can document it from your payment history.

Does refinancing or forgiveness change the deduction?

Refinanced loans generally keep qualifying as long as the proceeds retire a qualified student loan. Forgiven balances are usually taxable income to you when discharged outside specific programs, which can outweigh the interest deduction in a given year.

This calculator is an educational estimate, not tax advice. The interest cap and MAGI phase-out ranges are indexed and change with legislation, MAGI has technical add-backs this tool ignores, and eligibility depends on loan and dependency facts. Verify current-year figures with the IRS Form 1040 instructions or a CPA.

Student Loan Interest Deduction Calculator

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How the math works

Frequently asked questions

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