Student Loan Interest
You made a $500 student-loan payment. How much did you deduct?
| All income | Start broadly with economic income. | |
|---|---|---|
| − | Exclusions | Specific rules remove some items from gross income. |
| = | Gross income | Income remaining after exclusions. |
| − | Deductions for AGI | Amounts that reduce income before AGI; the subtraction may occur on a source document, schedule, or Schedule 1. |
| = | Adjusted gross income (AGI) | A major checkpoint used throughout the tax law. |
| − | Deductions from AGI | Standard deduction or itemized deductions, plus other allowed deductions. |
| = | Taxable income | The amount to which income-tax rates are applied. |
| × | Tax rates / tax computation | Progressive brackets and other rate rules convert taxable income into tax. |
| = | Income tax before credits | Tax before credits and other taxes. |
| − | Nonrefundable credits | Credits that reduce tax but generally not below zero. |
| + | Other taxes | Examples can include self-employment tax and additional taxes. |
| = | Total tax | The taxpayer’s total federal tax liability before payments. |
| − | Payments & refundable credits | Withholding, estimated payments, and refundable credits. |
| = | Refund or amount owed | Compare total tax with payments and refundable amounts. |
A student-loan payment can feel like one expense. Tax law makes us split it apart.
1. Start with the economic fact: interest is different from principal
Suppose you make a $500 student-loan payment.
Part of that payment may reduce the amount you borrowed—the principal—and part may be interest, the cost of borrowing the money.
The student-loan-interest deduction focuses on qualifying interest, not repayment of principal.
This is also a useful reminder that a payment can have more than one tax component. Always ask what the dollars actually represent before deciding whether they are deductible.
The principal may have helped create a tax benefit earlier
The principal repayment is not deductible now, but that does not mean the tax system necessarily ignored the education cost.
Suppose Maya originally borrowed money to pay qualified tuition and other eligible education expenses. Those expenses may have helped generate an education tax credit, such as the American Opportunity Tax Credit (AOTC) or the Lifetime Learning Credit, in the year the expenses were paid.
Borrowed money can count as payment for those credits. The credit is generally tied to the year the education expense is paid—not the later year when Maya repays the loan.
So the timing can look like this:
College years: borrowed funds pay qualifying
education expenses → a tax credit may be available.
Repayment years: principal repayment is not deductible
→ qualifying interest may be deductible.
We will cover the AOTC and Lifetime Learning Credit later in the Tax Credits section.
2. Then ask: is it qualifying student loan interest?
Tax law uses the idea of a qualified student loan. The debt generally must be connected to qualifying higher-education costs and satisfy additional requirements. The taxpayer also generally needs to be legally obligated to pay the interest.
You do not need a giant checklist of every unusual loan arrangement here.
If the facts involve refinanced debt, a payment by someone else, dependency questions, or uncertainty about who is legally responsible for the debt, recognize that more research may be needed.
3. The deduction has an annual maximum
For 2025, the maximum student-loan-interest deduction is $2,500.
If a taxpayer pays more qualifying interest than the annual maximum, start with the maximum before applying any income phaseout.
That is another useful tax habit:
First determine the potential benefit. Then ask whether another rule reduces it.
4. MAGI can reduce the deduction
Student loan interest is subject to a modified-AGI phaseout.
Use our recurring MAGI question:
Which modifications does this rule require?
Do not assume MAGI means the same thing for every provision.
For 2025, the phaseout range is:
- Single, Head of Household, and Qualifying Surviving Spouse: $85,000 to $100,000
- Married Filing Jointly: $170,000 to $200,000
Work the phaseout by predicting first
Assume Jordan is single and otherwise qualifies. Jordan paid $3,200 of qualifying student-loan interest. Assume an annual maximum deduction of $2,500, a phaseout range of $80,000 to $100,000, MAGI of $96,000, and a 22% marginal tax rate.
Before calculating, notice that $96,000 is well above the $90,000 midpoint. We should expect less than half of the maximum deduction to remain.
Interest paid $3,200
Annual maximum $2,500
MAGI above phaseout start:
$96,000 − $80,000 = $16,000
Phaseout range:
$100,000 − $80,000 = $20,000
Percentage phased out:
$16,000 ÷ $20,000 = 80%
Percentage remaining:
100% − 80% = 20%
Deduction remaining:
$2,500 × 20% = $500The reasonableness check works: Jordan is well above the midpoint, so a $500 deduction—only 20% of the maximum—makes sense.
If Jordan’s marginal federal income-tax rate is 22%, the approximate tax savings are:
$500 × 22% = $110 approximate federal income-tax savingsAgain, a $500 deduction does not mean the government paid $500 of Jordan’s interest.
5. Form 1098-E is evidence, not the tax rule
A lender may issue Form 1098-E showing student-loan interest received.
The form is useful information, but the form itself does not create the deduction.
You still have to ask whether the taxpayer and loan satisfy the tax rules, whether the amount is within the annual maximum, and whether MAGI reduces the benefit.
That is a recurring professional lesson:
Information reporting helps report facts. It does not replace the tax law.
6. What if someone else makes the payment?
Payments by another person can create additional questions about who is treated as having paid the interest and whether the taxpayer is legally obligated on the debt.
Do not force an answer from the Form 1098-E alone. Ask what actually happened and whether the rule treats the taxpayer as the person entitled to the deduction.
This is also a good place for our chapter-wide check:
Has this same expense or amount already received a tax benefit somewhere else?
Employer-provided student-loan assistance or another tax-favored education benefit can require additional coordination. When that happens, research the interaction rather than assuming the same dollars qualify twice.
7. Why a deduction?
Congress could support education borrowers through a deduction, credit, direct subsidy, exclusion, or another mechanism.
A deduction means the dollar value of the benefit can depend on the taxpayer’s marginal rate. That makes this a useful policy example.
Tax policy lab
Two taxpayers pay the same amount of qualifying student-loan interest. One has little taxable income. The other is in a higher marginal bracket.
If Congress provides the benefit as a deduction, will the dollar tax savings necessarily be the same?
Who is Congress trying to benefit?
Who actually receives the benefit?
8. Now try it
Alex is single and otherwise qualifies. Assume:
- $2,800 of qualifying student-loan interest;
- a $2,500 annual maximum;
- a phaseout range of $80,000 to $100,000;
- MAGI of $92,000; and
- a 22% marginal federal income-tax rate.
Estimate Alex’s allowable deduction and approximate federal income-tax savings.
Check your answer
First cap the qualifying interest at $2,500.
$92,000 is $12,000 into a $20,000 phaseout range:
$12,000 ÷ $20,000 = 60% phased out
100% − 60% = 40% remaining
$2,500 × 40% = $1,000 deductionApproximate federal income-tax savings:
$1,000 × 22% = $220The midpoint is $90,000. Because $92,000 is above the midpoint, less than half of the maximum deduction should remain. $1,000 is 40% of $2,500, so the result passes the reasonableness check.
The big ideas
- A loan payment can contain both principal and interest; only qualifying interest is relevant to this deduction.
- Principal repayment is not student loan interest.
- The education expenses originally paid with borrowed funds may have produced an earlier benefit, such as the AOTC or Lifetime Learning Credit; the later principal repayment itself is still not deductible.
- The student-loan-interest deduction is a deduction for AGI.
- Apply the annual maximum before an income phaseout.
- MAGI is provision-specific: ask which modifications this rule requires.
- Predict where you are in the phaseout before calculating, then check whether the answer makes sense.
- Form 1098-E reports information; it does not create the deduction.
- A deduction’s dollar value depends partly on the taxpayer’s marginal tax rate.