How Income Based Repayment Is Calculated: Formula, Limits & Steps

What Is Income Based Repayment?

Income Based Repayment is a federal student loan repayment plan that ties monthly payments to your income and family size. Unlike standard repayment, which divides the loan balance evenly over 10 years, IBR recalculates your payment annually based on your most recent tax return.

The IBR formula has two versions, depending on when you borrowed your first loans:

• Old IBR (borrowed before July 1, 2014): Monthly payment = 15% of discretionary income. Forgiveness after 25 years of qualifying payments.
• New IBR (borrowed on or after July 1, 2014): Monthly payment = 10% of discretionary income. Forgiveness after 20 years of qualifying payments.

For both versions, the payment is capped at the 10-year Standard Repayment amount, meaning your IBR payment will never exceed what you would pay under the standard plan.

Here is how discretionary income is calculated:

A single borrower earning $55,000 AGI with a family size of 1 would calculate as follows: Discretionary income = $55,000 − (1.5 × $15,060) = $55,000 − $22,590 = $32,410. Monthly payment (new IBR) = 10% × $32,410 ÷ 12 = approximately $270. This payment is subject to the standard 10-year cap, if the standard payment on the borrower's loans is $350, the IBR payment would be the lower $270.

IBR uses your Adjusted Gross Income (AGI) from your federal tax return, the figure on Line 11 of your 1040. This includes most sources of income but excludes certain nontaxable amounts.

Income that counts toward AGI for IBR purposes includes:

• Wages, salaries, and tips (W-2 income)
• Self-employment income (Schedule C or F)
• Interest and dividends
• Unemployment compensation
• Taxable Social Security benefits
• Distributions from retirement accounts (IRA, 401(k))

Income that does not count toward AGI for IBR:

• Nontaxable Social Security benefits
• Child support received
• Veterans' disability benefits
• Public assistance (SNAP, TANF)
• Income excluded under the Foreign Earned Income Exclusion (FEIE), though this requires specific documentation

If you are married and file jointly, your spouse's income is included in AGI. If you file separately (which is possible in some IDR plans), only your income counts, but you lose certain tax benefits. The MONEYlume editorial team recommends comparing the monthly payment difference between filing statuses if your spouse also has loans.

For self-employed borrowers, AGI is net profit, not gross revenue. If you report a loss on Schedule C, the AGI for that source is $0. However, a $0 AGI still produces a $0 IBR payment, which counts toward forgiveness only under certain conditions.

Related reading: How Do I File Taxes If I Have Both US and Foreign Income and How Do I Report Foreign Self Employment Income.

Follow these steps to estimate your IBR payment for 2026. Your actual payment will be determined by your loan servicer after you submit annual documentation.

1. Find your AGI. Use the most recent tax return (Line 11 of Form 1040). If your income has changed significantly, you can request a recalculation using current pay stubs instead.
2. Look up the 2026 poverty guideline. The Department of Health and Human Services publishes updated figures each January. For 2026, the 150% threshold for a single person is $22,590; for a family of 4, it is $46,575. These apply to the 48 contiguous states; Alaska and Hawaii have higher limits.
3. Calculate discretionary income. Subtract 150% of the poverty guideline for your family size from your AGI. If the result is $0 or negative, your IBR payment is $0.
4. Apply the IBR percentage. Multiply discretionary income by 10% (new IBR) or 15% (old IBR). This is your annual payment amount.
5. Divide by 12. Divide the annual amount by 12 to get your monthly payment. The result cannot exceed the 10-year Standard Repayment amount.

Here is a checklist table summarizing the process:

This article is informational and does not constitute personalized financial advice. Loan servicers use the IRS Data Retrieval Tool to verify AGI; estimates should be confirmed with your servicer.

IBR is not a permanent solution for all borrowers. Several limitations can affect long-term costs and forgiveness timelines.

Interest capitalization. If your IBR payment does not cover accruing interest, unpaid interest may capitalize (be added to principal) if you leave the plan or have a partial financial hardship end. For subsidized loans, the government pays interest for up to 3 consecutive years of economic hardship, but this period is limited.

Forgiveness taxability. Under current law through December 31, 2025, forgiven IBR balances are not treated as taxable income. Beyond 2025, the tax treatment depends on legislative action. Borrowers should plan for the possibility that forgiveness after 2025 may be taxable.

Annual recertification. You must recertify your income and family size each year, typically around the same month you initially applied. Missing the deadline causes your payment to revert to the standard 10-year amount, which can be significantly higher. It also does not count toward IDR forgiveness during the gap.

Married borrowers. Filing jointly counts both spouses' income. Filing separately may exclude spousal income but eliminates some tax deductions and credits (like the student loan interest deduction). The trade-off varies by income level.

Related reading: How Do I Make a Student Loan Repayment Plan.

Expert Tips

• Use the IRS Data Retrieval Tool when recertifying, it imports your AGI directly and reduces documentation errors.
• If your income drops mid-year (job loss, medical leave), request a recalculation rather than waiting for annual recertification.
• Keep copies of all recertification confirmations, servicer data errors can reset your payment count toward forgiveness.
• If you expect no tax liability, consider using the Married Filing Separately status to exclude spousal income from IBR calculations.

Mistakes to Avoid

• Missing recertification deadlines. A missed deadline raises your payment to the standard amount and halts forgiveness progress, for up to 12 months until you recertify.
• Assuming forgiveness is automatic. You must submit an application for forgiveness after reaching 20 or 25 years of qualifying payments.
• Forgetting to update family size. Adding a dependent reduces your discretionary income threshold, which can lower your payment.

Pros and Cons

Bottom Line

IBR remains a solid choice for borrowers with high debt relative to income, especially those who borrowed before 2014 and need the 25-year forgiveness timeline. However, newer borrowers may find the Saving on a Valuable Education (SAVE) or Pay As You Earn (PAYE) plans more favorable because of lower payment caps and shorter forgiveness timelines. IBR's main advantage is its predictability and longevity, it has survived legislative changes that have altered or ended other IDR plans. For borrowers who qualify and can commit to annual recertification, it provides reliable payment relief and a path to forgiveness.