What Is an Income-Driven Repayment Plan and How Does It Work?

What Is an Income-Driven Repayment Plan?

An income-driven repayment (IDR) plan ties your monthly federal student loan payment to your income and family size rather than your loan balance. Instead of a fixed payment calculated over 10 years, you pay a percentage of your discretionary income—the amount left over after accounting for basic living expenses—each month. Payments can be as low as $0 if your income falls below a certain threshold.

These plans exist because the federal government recognizes that a standard 10-year repayment schedule is unaffordable for many borrowers, especially those who entered lower-paying careers or are just starting out. IDR plans give you breathing room while keeping your loans in good standing.

The Four Main IDR Plans

There are currently four IDR plans for federal student loans. Each has different eligibility rules, payment calculations, and forgiveness timelines.

How Discretionary Income Is Calculated

Under most IDR plans, discretionary income is defined as the difference between your adjusted gross income (AGI) and 150% of the federal poverty guideline for your family size and state. The SAVE plan uses 225% of the poverty guideline, which means more of your income is protected and your payment is lower.

For example, if you are single with an AGI of $45,000 in 2026, the federal poverty guideline is approximately $15,060. Under IBR, you would subtract 150% of that ($22,590) from your income: $45,000 – $22,590 = $22,410 in discretionary income. At 10%, your monthly payment would be about $186.

The SAVE Plan: The Newest and Most Generous Option

The SAVE plan, introduced in 2023, replaced the REPAYE plan and is generally the most favorable option for recent borrowers. Key features include:

• Undergraduate loan payments capped at 5% of discretionary income (instead of 10%)
• Discretionary income defined using 225% of the poverty line
• Unpaid interest does not capitalize as long as you make your required payments
• Forgiveness after 10 years for borrowers who originally had $12,000 or less in loans

The interest subsidy is a major benefit. Under older plans, unpaid monthly interest could be added to your principal, causing your balance to grow even while you made payments. SAVE eliminates that trap.

Who Should Use an IDR Plan?

IDR plans make the most sense in several scenarios:

• Low income relative to debt: If your monthly payment under the standard 10-year plan is more than 10% of your take-home pay, IDR is worth exploring.
• Public Service Loan Forgiveness (PSLF) seekers: PSLF requires 120 qualifying payments on an IDR plan. Keeping payments low maximizes the amount forgiven.
• Unstable or variable income: If you are self-employed, work seasonally, or have unpredictable income, IDR adjusts every year based on your most recent tax return.
• Graduate school borrowers: Those with $100,000+ in graduate school debt often face payments that would otherwise consume 20–25% of their income.

How to Apply for an IDR Plan

You can apply for an IDR plan at studentaid.gov. The process takes about 10 minutes:

1. Log in with your FSA ID
2. Select “Income-Driven Repayment Plan Request”
3. Choose a specific plan or let the system recommend the lowest payment option
4. Consent to IRS data sharing so your income is automatically verified
5. Submit and receive confirmation from your loan servicer within a few weeks

You must recertify your income and family size every year. If you miss the recertification deadline, your payment reverts to what it would be under the standard plan and unpaid interest may capitalize. Set a calendar reminder 60 days before your anniversary date.

Loan Forgiveness After IDR

After 20 or 25 years of qualifying payments (depending on the plan), any remaining balance is forgiven. However, this forgiven amount may be considered taxable income under current law, which means you could owe a large tax bill in the year of forgiveness. This is sometimes called the “tax bomb.” Planning for this years in advance—by setting aside money in a savings account—is essential.

The exception is PSLF: forgiveness under that program is tax-free and happens after just 10 years.

IDR vs. Standard Repayment: Which Costs More?

IDR plans typically result in paying more interest over time because you are extending the repayment period. A borrower who owes $35,000 at 6.5% interest would pay approximately $7,200 in total interest under the standard 10-year plan. Under a 20-year IDR plan at low payments, they might pay $18,000 or more in interest—though the forgiven balance offsets this if the full term is reached.

The right approach depends on your goals. If you plan to pay off loans aggressively, the standard plan costs less. If you are pursuing PSLF or genuinely cannot afford standard payments, IDR is the smarter path.

Common Mistakes to Avoid

• Ignoring recertification: Missing the annual deadline causes payment increases and interest capitalization.
• Choosing the wrong plan: IBR may be better for married borrowers filing jointly whose spouse also has loans.
• Not applying at all: Many borrowers in default or financial hardship don’t know IDR is available. You can enroll even if your loans are past due (though you may need to rehabilitate them first).
• Assuming $0 payments don’t count: $0 payments under an IDR plan still count toward forgiveness and PSLF.