Student Loan Interest Deduction Calculator
Student loan interest write-off from paid interest, MAGI, and filing per IRS.
What it does
Student loan interest deducts up to $2,500 above the line, then phases out across a $15,000 single or $30,000 joint window that moves by year. High earners keep part, then nothing.
The tool above takes interest paid, MAGI, status, and year. It returns the allowed deduction with the phased out slice and the band label.
The default 2025 single filer at $92,500 MAGI with $2,800 paid sits halfway through phaseout and keeps $1,250. A 2025 joint couple at $185,000 with $2,000 paid keeps $1,000.
Math follows IRS Topic 456 with Publication 970 Chapter 4 behind it. Both pin the $2,500 cap and the yearly phaseout bands used here.
How to use
- Enter interest paid in the year.
- Enter MAGI.
- Pick single or joint status.
- Pick the tax year.
- Read the deduction first.
- Read the phased out slice beside it.
Formula
- paid
- Interest actually paid that year.
- lower
- Phaseout floor by year and status.
- span
- 15,000 single, 30,000 joint.
- full
- Lesser of 2,500 or paid.
Full amount survives at or below the lower limit and dies at or above the upper one. Worksheets round to dollars. Filing separately or being claimed as a dependent zeroes the claim regardless of income.
Worked example
Example: mid phaseout single filer
Defaults: 2025 single, $2,800 interest paid, $92,500 MAGI.
- Full amount: min(2,500, 2,800) = $2,500.
- Lower limit 2025 single: $85,000.
- Excess: 92,500 - 85,000 = $7,500.
- Fraction: 7,500 / 15,000 = 0.5.
- Reduction: 2,500 x 0.5 = $1,250.
- Allowed: 2,500 - 1,250 = $1,250.
- Tool shows $1,250.00, $1,250.00 phased out, partially phased out.
Reference table
| Year | Single | Joint |
|---|---|---|
| 2025 | $85k to $100k | $170k to $200k |
| 2024 | $80k to $95k | $165k to $195k |
| 2023 | $75k to $90k | $155k to $185k |
Limits
- Yearly bands; pick the right year.
- Related-person and plan loans excluded.
- Dependent claimants get $0.
- Principal never deducts.
Common mistakes
- Using gross income for MAGI.
- Filing separately and claiming.
- Counting late fees as interest.
- Missing the 1098-E threshold logic.
- Applying the wrong year bands.
Try it yourself
Quick checks. Answers sit tucked under each question.
2025 joint, $185k MAGI, $2,000 paid?
Excess 15,000 / 30,000 = 0.5: keeps $1,000.00, loses $1,000.00.
2025 single, $60k MAGI, $3,000 paid?
Under the $85k floor: full $2,500.00, $0.00 phased out.
2025 single, $100k MAGI, $2,500 paid?
At the $100k ceiling: $0.00, fully phased out.
Questions
How much interest deducts?
Lesser of $2,500 or interest actually paid, above the line with no itemizing.
Where is the phaseout?
2025: $85k to $100k single, $170k to $200k joint. Older years phase lower.
Can separate filers claim it?
Never. Married filing separately always gets $0.
Which loans qualify?
Loans solely for qualified higher education of you, spouse, or a dependent at that time.
Do voluntary prepayments count?
Yes, if otherwise qualified. Subtract employer-paid educational assistance parts.
Will I get Form 1098-E?
Expect Form 1098-E at $600 or more paid. Smaller amounts still count with records.