To calculate your AGI for student loans, add up every source of taxable income you received during the year, then subtract the above-the-line adjustments you qualify for. The result appears on Line 11 of IRS Form 1040, and it is the number the Department of Education uses to size your monthly payment under an income-driven repayment (IDR) plan and to calculate your Student Aid Index on the FAFSA.1Consumer Financial Protection Bureau. What Are Income-Driven Repayment (IDR) Plans, and How Do I Qualify? Getting the number right matters, because even a small error can inflate your payments or create compliance problems with the IRS and your servicer.
Step 1: Add Up Your Gross Income
Gross income is everything the IRS considers taxable that you earned or received during the calendar year. For most borrowers, wages and salary do most of the work. The IRS requires you to include all compensation for personal services, including commissions, tips, and bonuses.2Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income Your employer reports those amounts on Form W-2, which you should have by late January.
Self-employment counts too. If you freelance, run a business, or take contract work, your net earnings (revenue minus business expenses) go into gross income. Investment income belongs here as well: interest from bank accounts, ordinary dividends, and capital gains from selling stocks or other assets.
Less obvious sources that borrowers sometimes miss:
- Taxable withdrawals from traditional IRAs, 401(k) plans, and pensions
- Net profit from renting out property
- Royalties from copyrights, patents, or mineral rights
- Unemployment compensation received during any period of joblessness
Add every dollar from those sources together to get total gross income. That is the starting line.3Internal Revenue Service. Definition of Adjusted Gross Income
Step 2: Subtract Your Adjustments
Federal tax law lets you subtract certain expenses from gross income to arrive at AGI. These are often called “above-the-line” deductions because they come out before you choose between itemizing and the standard deduction. For a borrower, every dollar subtracted here directly lowers the income figure your servicer will use.
Student Loan Interest
The most directly relevant adjustment is the student loan interest deduction. You can subtract up to $2,500 of interest paid on qualified student loans during the year, whether or not you itemize.4Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction The deduction phases out as your modified AGI rises and disappears entirely for higher earners, so confirm you still qualify before counting on it.
Retirement and HSA Contributions
Traditional IRA contributions can be deducted if you meet income and workplace-plan requirements. For 2026, the contribution limit is $7,500, or $8,600 if you are 50 or older.5Internal Revenue Service. Retirement Topics – IRA Contribution Limits Whether you can actually deduct the contribution depends on your income and whether you or your spouse are covered by an employer retirement plan.6Internal Revenue Service. Traditional and Roth IRAs
Health Savings Account contributions are fully deductible if you are enrolled in a high-deductible health plan, and you take the deduction without itemizing.7Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans For 2025, the maximum HSA contribution was $4,300 for self-only coverage and $8,550 for family coverage; limits adjust annually for inflation.8Internal Revenue Service. Instructions for Form 8889 (2025)
Self-Employment Adjustments
If you are self-employed, you can deduct half of the self-employment tax you owe. This accounts for the employer share of Social Security and Medicare that a W-2 employee never pays out of pocket. Self-employed borrowers can also deduct premiums paid for their own health insurance and coverage for a spouse and dependents. Both adjustments are reported on Schedule 1 of Form 1040.
Educator Expenses
Eligible teachers and school administrators can deduct up to $300 per person for unreimbursed classroom supplies, equipment, and professional development. Two educators filing jointly share a $600 cap.9Internal Revenue Service. Deducting Teachers’ Educational Expenses Small in dollars, but for a borrower on an IDR plan, even $300 off your AGI trims your monthly payment slightly.
Other Adjustments
A few less common adjustments apply in specific situations:
- Alimony payments are deductible only if the divorce or separation agreement was executed before 2019. Agreements finalized after 2018 do not qualify.10Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
- Active-duty service members who relocate for a permanent change of station can deduct unreimbursed moving costs for household goods, storage, and travel (not meals).11Internal Revenue Service. Topic No. 455, Moving Expenses for Members of the Armed Forces and the Intelligence Community
- If your employer kept paying your salary during jury duty and you turned the jury fees over to them, you can deduct the amount remitted.2Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income
A Worked Example
The arithmetic is simple once the pieces are in place. Add all taxable income; subtract every adjustment you qualify for. The IRS uses a clean example on its own site: if total income is $71,000 and adjustments total $2,750, AGI is $68,250.3Internal Revenue Service. Definition of Adjusted Gross Income An inflated AGI produces a higher discretionary income, which means a larger monthly IDR payment. An understated AGI creates tax compliance problems and can force you to recertify with corrected numbers later.
Where to Find Your AGI
On a filed return, your AGI is on Line 11 of Form 1040.12Internal Revenue Service. Adjusted Gross Income Seniors using Form 1040-SR will find the same figure on Line 11a, labeled “This is your adjusted gross income.”13Internal Revenue Service. 2025 Form 1040-SR – U.S. Income Tax Return for Seniors Prior years used different line numbers, but the label has stayed consistent.
The fastest lookup without paper is the IRS Online Account at irs.gov. Sign in and pick the year you need under the Records and Status tab.12Internal Revenue Service. Adjusted Gross Income If that is not available to you, request a free tax return transcript from the IRS; the transcript shows AGI in the summary section.14Internal Revenue Service. Get Your Tax Records and Transcripts Servicers and financial aid offices sometimes ask specifically for a transcript during verification.
Which Year’s AGI Gets Used
FAFSA and IDR pull from different tax years, and borrowers confuse them constantly.
FAFSA Uses the Prior-Prior Year
The FAFSA uses income data from two years before the academic year you are applying for. For the 2026–2027 school year, the form pulls your 2024 tax information. Since the 2024–2025 award year, a direct data exchange between the IRS and Federal Student Aid (the FA-DDX) automatically imports your tax information, including AGI, once you consent on the form.15Federal Student Aid Handbook. Filling Out the FAFSA – 2024-2025 That AGI feeds directly into the Student Aid Index calculation.16Federal Student Aid Handbook. Student Aid Index (SAI) and Pell Grant Eligibility – 2024-2025
IDR Uses the Most Recent Processed Return
IDR works differently. Your servicer uses whichever return the IRS has most recently processed. If you have already filed for the current year and the IRS has processed it, that return is used; if not, the previous year’s return applies.17Federal Student Aid. Which Tax Year Does the Income-Driven Repayment (IDR) Application Use The timing of when you apply or recertify can therefore change which year’s income sets your payment.
Filing Status Changes What AGI Gets Used
Married borrowers face a choice that can move their monthly bill significantly. Under most IDR plans, filing jointly means the Department of Education uses combined household income to calculate the payment. Filing separately limits the calculation to your individual income.18Federal Student Aid. 4 Things to Know About Marriage and Student Loan Debt
Filing separately often lowers the loan payment, especially when one spouse earns much more than the other. But it also costs you access to several tax benefits, including the student loan interest deduction, certain education credits, and Roth IRA contributions at higher income levels. Run the numbers both ways.
Community property states add a complication. In Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin, borrowers who file separately generally must each report half of all community income on their individual return.19Internal Revenue Service. Publication 555, Community Property That can partially undo the strategy of separating returns to reduce reported AGI for loan purposes.
When Your Current Income Differs From Your Return
Tax returns reflect last year. Life doesn’t wait. If you have lost a job, had hours cut, or seen any other significant income drop since filing, you don’t have to accept a payment based on stale numbers.
The IDR application lets you provide alternative documentation of current income instead of pulling tax data. You supply proof of every source of taxable income you currently receive, such as a recent pay stub or a letter from your employer showing gross pay. Each document has to be dated within 90 days of when you sign the application, and you note how often the income is received (weekly, biweekly, monthly).20Federal Student Aid. Income-Driven Repayment (IDR) Plan Request If you cannot document a particular source, you can attach a signed statement explaining the source, amount, and contact information.
Recertify Every Year
Enrolling in an IDR plan is not a one-time event. You have to recertify your income and family size every year to stay on the plan. Your servicer will notify you when recertification is due, and the process asks for updated AGI through a direct link to IRS data, or by submitting a return or transcript.
Missing the deadline is one of the most costly mistakes. If you don’t recertify on time, your payment can jump to what you would owe under the standard 10-year plan, and unpaid accrued interest can be added to your principal balance through capitalization. Getting back on track means reapplying, and the damage from even a few months of higher payments and capitalized interest can be significant.
SAVE Plan Borrowers
The SAVE plan (formerly REPAYE) is effectively unavailable as of late 2025. After court challenges, the Department of Education announced a proposed settlement that would end the plan, stop new enrollments, and move existing SAVE borrowers into other options. SAVE borrowers have been placed in forbearance, but interest has been accruing since August 2025, and time in this forbearance does not count toward Public Service Loan Forgiveness or IDR forgiveness.21Federal Student Aid. IDR Court Actions If you were on SAVE, contact your servicer about switching to PAYE, IBR, or ICR.