Student Loan Interest Deduction Calculator
The interest you paid, and the income that decides what is left
Your result will appear here
Fill in the fields on the left and this updates as you type.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Educational estimate only. Confirm the assumptions, current rules, fees, and rounding that apply to your situation before making a decision.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter the student loan interest you actually paid during the year. Your servicer reports it on Form 1098-E, though if you paid less than the reporting threshold you may receive no form and still have interest to deduct.
- 02
Enter your modified adjusted gross income. This is the figure the phase-out is measured against, so an estimate that is roughly right matters more than the interest figure being exact.
- 03
Set your filing status — 1 for single, 2 for married filing jointly. There is no option for married filing separately because the deduction is not available at all on that status.
- 04
Enter your marginal federal rate. The deduction reduces income rather than tax, so this is what turns the deduction into money.
- 05
Read the deduction, the tax saved and the MAGI at which it disappears, then look at the schedule to see how quickly the phase-out takes it away.
Formula
Two ceilings apply before income is considered at all: Before phase-out = the smaller of (interest paid, $2,500) Then the phase-out reduces it in a straight line across the band: If MAGI is at or below the start: you keep all of it If MAGI is at or above the end: you keep none of it In between: share allowed = 1 − (MAGI − start) ÷ (end − start) Deduction = Before phase-out × share allowed Because it is a deduction rather than a credit, it reduces income and not tax, so its value is: Tax saved = Deduction × your marginal rate 2026 bands, from Rev. Proc. 2025-32 §3.29: $85,000 to $100,000 for a single filer, $175,000 to $205,000 on a joint return. Inside the band each extra dollar of income also shaves the deduction, so the real cost of that dollar is higher than the marginal rate alone suggests: Extra cost per $1,000 of MAGI = ($2,500 ÷ band width) × $1,000 × marginal rate
Example
Pay $1,800 of student loan interest with $78,000 of modified adjusted gross income, filing single at a 22% marginal rate. That income sits below the $85,000 start of the 2026 phase-out, so nothing is lost and the full $1,800 is deductible — the $2,500 ceiling never binds, because the interest is below it. The deduction saves $396 of actual tax, which is 22.0% of the interest paid. There is $22,000 of MAGI room before the deduction disappears at $100,000. The schedule traces the decline: the deduction is still whole at $83,000, falls to $1,560 at $87,000, to $1,080 at $91,000, to $600 at $95,000, to $120 at $99,000, and is gone by $103,000. Inside the band, each extra $1,000 of income costs about $26 in lost deduction on top of the ordinary tax. Two alternates confirm the ends of the range. At $105,000 of MAGI the deduction is $0 and the entire $1,800 has been taken by the phase-out, so the interest buys nothing at all. At $60,000 the position is the same as the example — $1,800 deductible, $396 saved — but with $40,000 of room rather than $22,000, which is the practical difference between a deduction you can rely on and one a raise or a bonus could remove.
Definitions
- Adjustment to income
- A deduction taken before adjusted gross income is settled, available whether or not you itemise. The student loan interest deduction is one, which is why it survives the standard deduction.
- Modified adjusted gross income (MAGI)
- Adjusted gross income with certain items added back. It is the figure the phase-out is measured against, and it is usually close to adjusted gross income for most borrowers.
- Phase-out band
- The income range across which a tax break is withdrawn in a straight line. For 2026 it runs from $85,000 to $100,000 for a single filer and $175,000 to $205,000 on a joint return.
- Form 1098-E
- The Student Loan Interest Statement a servicer sends when you have paid enough interest in the year to require reporting. Interest can still be deductible when no form arrives.
- Capitalised interest
- Unpaid interest added to the principal of a loan. It can count towards the deduction when it is later paid, which is why a payment's tax allocation may differ from the servicer's statement.
Good to know
The one deduction you get without itemising
The student loan interest deduction is unusual in the modern tax code, and its value is easy to underestimate because the amounts involved look small. It allows up to $2,500 of interest actually paid during the year on a qualified education loan to be subtracted from income. What makes it genuinely useful is where it sits on the return. IRS Publication 970 says the deduction is claimed as an adjustment to income, which means, in the publication's own words, that you can claim this deduction even if you do not itemize deductions on Schedule A. That distinction decides whether most people get any benefit at all. With the 2026 standard deduction at $16,100 for a single filer and $32,200 on a joint return, under Rev. Proc. 2025-32 §4.14, the overwhelming majority of taxpayers never itemise, and every deduction that lives on Schedule A is therefore worth nothing to them. An adjustment to income survives that, because it is taken before adjusted gross income is settled rather than after. There is a second, quieter advantage to sitting above the line. Because the deduction reduces adjusted gross income itself, it can help with other provisions measured against that figure — other phase-outs, other thresholds and, in some states, the starting point for the state return. Be clear about what it is not, though. It is a deduction and not a credit, so it reduces the income on which tax is computed rather than reducing the tax itself. On the page's example, $1,800 of interest deducted at a 22% marginal rate saves $396 of actual tax. That is the honest number: not $1,800, and not nothing. Understanding that difference is the single most common correction people need when they first look at this deduction, and it is why the page shows the tax saved as prominently as the deduction itself.
How the phase-out takes it away
The deduction is withdrawn as income rises, and it is withdrawn in a straight line rather than at a cliff. For 2026 the band runs from $85,000 to $100,000 of modified adjusted gross income for a single filer, and from $175,000 to $205,000 on a joint return, figures published in Rev. Proc. 2025-32 §3.29 and carried on this page as editable fields so a later year is a one-field change. Below the start of the band you keep the whole deduction; above the end you keep none of it, however much interest you actually paid; and inside the band you keep a proportion that falls smoothly from all to nothing. On the page's example, $78,000 of modified adjusted gross income sits below the start, so the full $1,800 stands and there is $22,000 of room before it disappears. The schedule on the page traces the descent from there: still whole at $83,000, down to $1,560 at $87,000, to $1,080 at $91,000, to $600 at $95,000, to $120 at $99,000, and gone by $103,000. An alternate run at $105,000 confirms the end state, where the deduction is $0 and the entire $1,800 has been taken. The band has a consequence that the headline marginal rate hides, and it is worth knowing if you are near it. Inside the band every extra dollar of income is taxed at your ordinary rate and also shaves a fraction off the deduction, so the true cost of that dollar is higher than the bracket suggests. On the example each additional $1,000 of modified adjusted gross income costs about $26 of tax through the lost deduction alone. The same arithmetic works in reverse, which is the practical point: anything that legitimately reduces modified adjusted gross income — a traditional retirement contribution, a health savings account contribution — can pull you back into the band and restore part of the deduction, on top of whatever the contribution saves directly.
Two rules that disqualify people entirely
Most tax provisions taper. This one has two conditions that do not taper at all, and between them they catch a great many of the people who most expect to claim the deduction. The first is filing status. Publication 970 lists among the conditions for claiming the deduction that your filing status is any filing status except married filing separately. There is no reduced amount and no exception for the spouse who actually holds the loan and made every payment from their own account. This deserves particular attention from married borrowers on income-driven repayment plans, because filing separately is a common strategy for keeping a payment calculation based on one income rather than two. That strategy has a price, and this deduction is part of it. Anyone weighing separate filing should price the lost deduction alongside the lower payment rather than looking at the payment in isolation. The second condition is dependency. The same list requires that no one else is claiming you as a dependent on their tax return. A student who is still claimed as a dependent on a parent's return cannot take the deduction even where the loan is in the student's name and the student made every payment. Nor, in that situation, can the parent take it, unless the parent is themselves legally obliged to repay the loan — the deduction follows legal obligation, not who writes the cheque. This produces the awkward result that in the years when a borrower has the least income and the interest is accruing fastest, the deduction may be available to nobody at all. Beyond those two, the loan itself has to qualify: it must have been taken out solely to pay qualified education expenses for you, your spouse or your dependent, and you must be legally obliged to repay it. A loan from a relative, or a loan under a qualified employer plan, does not count.
Finding the number, and what counts as interest
The figure to enter comes from Form 1098-E, the Student Loan Interest Statement, which a servicer sends when you have paid enough interest during the year to require an information return. Most borrowers with a meaningful balance will receive one, and for them the number is simply read off the form. The trap is assuming that no form means no deduction. If you paid less than the reporting threshold, the lender is not obliged to issue anything, and Publication 970 works an example through precisely this situation — a borrower who receives no 1098-E and instead deducts interest calculated from the lender's account statement. The absence of a form is an administrative fact, not a tax one. What counts as interest is also more generous than the plain word suggests, and this is where careful borrowers sometimes find more deduction than they expected. Loan origination fees can be deductible interest, allocated over the term of the loan by any reasonable method where they are not already included in the reported figure. Capitalised interest — unpaid interest that has been added to the principal of the loan — counts when it is later paid. And Publication 970 warns explicitly that the allocation of payments between interest and principal for tax purposes might not be the same as the allocation shown on the Form 1098-E or other statement from the lender or servicer. For tax purposes a payment generally applies first to stated interest unpaid as of the date the payment is due, then to loan origination fees allocable to the payment, then to capitalised interest still unpaid, and only then to outstanding principal. Two final points of perspective. The ceiling is $2,500 of interest, not $2,500 of tax saved, and interest above the ceiling buys nothing however large the balance. And none of the figures on this page are a substitute for a return: they are an estimate built from what you typed, and a return preparer settles what actually goes on the form.
Frequently asked questions
How much student loan interest can I deduct?
Up to $2,500 of interest actually paid in the year, reduced by the phase-out. For 2026 the phase-out runs from $85,000 to $100,000 of modified adjusted gross income for a single filer and from $175,000 to $205,000 on a joint return, per Rev. Proc. 2025-32 §3.29. On the page's example — $1,800 of interest at $78,000 of MAGI — the income is below the band, so the whole $1,800 is deductible and saves $396 at a 22% rate.
Do I have to itemise to claim it?
No, and this is the best thing about it. IRS Publication 970 says the deduction is claimed as an adjustment to income, which means you can claim it even if you do not itemise deductions on Schedule A. That matters because the 2026 standard deduction is $16,100 for a single filer and $32,200 on a joint return, so most people never itemise at all. A deduction that survives the standard deduction is worth having, and it reduces adjusted gross income, which can help with other thresholds measured against it.
Can I claim it if I am married filing separately?
No. Publication 970 lists among the conditions for claiming the deduction that your filing status is any status except married filing separately. There is no reduced amount and no exception for the spouse who actually owes the loan and made every payment. Couples with student loans who are considering filing separately for an income-driven repayment calculation should price this loss alongside whatever the separate filing saves on the payment.
Can I claim it if my parents claim me as a dependent?
No. The same list in Publication 970 requires that no one else is claiming you as a dependent on their tax return. A student still claimed as a dependent cannot take the deduction even where the loan is theirs and they made the payments. The parent cannot take it either unless they are legally obliged to repay the loan — the deduction follows the person with the legal obligation, not the person writing the cheque.
What happens as my income rises?
It disappears in a straight line across the band. On the example the deduction is intact at $78,000 with $22,000 of room left. The schedule shows it falling to $1,560 at $87,000 of MAGI, $1,080 at $91,000, $600 at $95,000, $120 at $99,000 and nothing at all from $100,000. Rerunning the page at $105,000 of MAGI confirms it: the deduction is $0 and the full $1,800 has been taken by the phase-out. Inside the band each extra $1,000 of income also costs about $26 of tax through the lost deduction, on top of the ordinary tax on that income.
What counts as student loan interest?
Interest on a loan taken out solely to pay qualified education expenses for you, your spouse or your dependent, that you are legally obliged to repay. It is more generous than it first appears: capitalised interest and loan origination fees can count, and Publication 970 notes that the allocation of a payment between interest and principal for tax purposes may not match what your servicer's statement shows. The publication works an example through a borrower who deducts interest from an account statement after no Form 1098-E arrived at all.