Income Driven Repayment IDR Plan Calculator
What This Calculator Does and Why It Is Useful
Federal student loan borrowers with high debt relative to their income can significantly reduce their monthly payments through Income-Driven Repayment (IDR) plans. These programs cap your monthly payment as a percentage of your discretionary income and offer loan forgiveness after 20 or 25 years of qualifying payments.
This free income driven repayment IDR plan calculator shows your estimated monthly payment under the three most widely available IDR plans — IBR (Income-Based Repayment), PAYE (Pay As You Earn), and ICR (Income-Contingent Repayment) — based on your adjusted gross income, family size, and loan balance. It also compares each plan to the standard 10-year repayment option so you can see the trade-offs clearly.
Understanding these differences can save borrowers hundreds of dollars per month and help them decide whether pursuing forgiveness makes financial sense given their career and income trajectory.
How to Use This Calculator
Step-by-Step Instructions
- Enter your Adjusted Gross Income (AGI) — this is your income after above-the-line deductions, found on line 11 of your Form 1040.
- Select your family size — this is the number of people in your household, including yourself, your spouse, and dependents.
- Enter your total federal student loan balance and your interest rate.
- Select your state — Alaska and Hawaii have higher federal poverty guidelines, which affects your discretionary income calculation.
- Click “Compare IDR Plans” to see a side-by-side breakdown of each plan’s monthly payment, interest accrual, forgiveness timeline, and negative amortization risk.
The Formula Explained
Breaking Down the Formula
Every IDR plan calculates your monthly payment the same way at a high level: take your annual discretionary income, multiply by a plan-specific payment percentage, and divide by 12. The difference between plans is how “discretionary income” is defined and what payment percentage applies.
For IBR (new borrowers) and PAYE, discretionary income is your AGI minus 150% of the federal poverty guideline for your family size. The payment is 10% of that amount per year, divided by 12. For ICR, discretionary income is calculated above 100% of the poverty line, and the payment is 20% of that amount. You can verify the current poverty guidelines on the HHS Poverty Guidelines page.
Example Calculation with Real Numbers
Assume a single borrower with an AGI of $50,000, a loan balance of $40,000 at 6.54%, and a family size of 1. The 2024 federal poverty guideline for one person in the contiguous states is $15,060. Under IBR (new borrowers): 150% of $15,060 = $22,590. Discretionary income = $50,000 − $22,590 = $27,410. Annual payment = 10% × $27,410 = $2,741. Monthly payment = $228.42.
Monthly interest accrual = $40,000 × 6.54% / 12 = $218. Since the payment exceeds the interest, this borrower is making positive progress on the principal while still saving over the standard 10-year payment. Borrowers in this situation can also benefit from reviewing the IDR plan calculator alongside the student loan interest capitalization calculator to understand how unpaid interest could add to their balance over time.
When Would You Use This
Real Life Use Cases
IDR plans are particularly valuable for borrowers in lower-paying careers, those going through a temporary income reduction, or graduates in public service jobs pursuing Public Service Loan Forgiveness (PSLF). The lower the income relative to the loan balance, the more meaningful the IDR savings become.
Specific Example Scenario
A social worker earns $38,000 per year with $65,000 in student loan debt. Under a standard 10-year plan, their payment would be well over $700 per month. Under IBR (new borrower), their payment drops to around $150 per month. After 10 years of payments in a qualifying government or nonprofit job, the remaining balance could be forgiven under PSLF. This type of borrower should also check the student loan forgiveness tax liability calculator to understand any tax obligations on forgiven amounts if their forgiveness comes through a non-PSLF route.
For borrowers looking to refinance instead, the Parent PLUS loan refinance savings calculator is also a useful comparison tool when weighing IDR vs private refinancing options.
Tips for Getting Accurate Results
Use Your Most Recent AGI, Not Gross Income
IDR payment calculations use Adjusted Gross Income, not your gross salary. Contributions to a traditional 401(k), HSA, or student loan interest deductions reduce your AGI, which in turn reduces your IDR payment. Always use the AGI figure from your most recently filed federal tax return.
Understand Negative Amortization Risk
If your IDR payment is lower than the monthly interest accruing on your loan, your balance will grow even while you are making payments. This is called negative amortization. Some plans offer an interest subsidy, but it is limited. Borrowers in this situation should model long-term balance projections before committing to an IDR plan assuming forgiveness.
SAVE Plan Status May Affect Your Options
The SAVE (Saving on a Valuable Education) plan was introduced in 2023 as a replacement for REPAYE, offering even lower payments for many borrowers. However, as of 2024–2025, SAVE has been subject to legal challenges and court injunctions. Always check the Federal Student Aid website for the latest status of available repayment plans before submitting an application.
Frequently Asked Questions
What are the main income-driven repayment plans available?
The main IDR plans are Income-Based Repayment (IBR), Pay As You Earn (PAYE), Income-Contingent Repayment (ICR), and the newer SAVE plan (currently under legal review). Each plan has different eligibility requirements, payment percentages, and forgiveness timelines ranging from 20 to 25 years.
How is discretionary income calculated for IDR plans?
For IBR and PAYE, discretionary income is your AGI minus 150% of the federal poverty guideline for your family size and state. For ICR, it is your AGI minus 100% of the poverty guideline. The poverty guidelines are updated annually by the Department of Health and Human Services.
What is the forgiveness timeline under each IDR plan?
IBR (new borrowers after July 1, 2014) and PAYE offer forgiveness after 20 years of qualifying payments. Older IBR borrowers and ICR borrowers receive forgiveness after 25 years. PSLF offers forgiveness after just 10 years for borrowers in qualifying public service jobs.
Is the forgiven amount taxable under IDR plans?
Historically, amounts forgiven under IDR plans were taxable as ordinary income in the year of forgiveness. However, under current law through 2025, this tax has been temporarily suspended for most IDR forgiveness under the American Rescue Plan Act provisions. It is important to monitor tax law changes and plan ahead for a potential tax liability if your forgiveness falls outside this window.
Can married borrowers benefit from filing taxes separately to lower IDR payments?
Yes. Some IDR plans calculate the payment based only on the borrower’s income when they file taxes separately from their spouse. This strategy can significantly reduce the IDR payment but comes at the cost of losing certain tax benefits available to married couples filing jointly. It requires careful tax analysis each year.
Does IBR apply to Parent PLUS loans?
Parent PLUS loans are not directly eligible for most IDR plans including IBR and PAYE. However, if a Parent PLUS loan is consolidated into a Direct Consolidation Loan, it may become eligible for ICR. This is an important distinction for parents carrying PLUS loan debt on behalf of their children.
What happens if my income increases significantly while on an IDR plan?
IDR payments are recertified annually based on your latest tax return or income documentation. If your income increases, your monthly payment increases proportionally. In some cases, a borrower’s income may grow to the point where their IDR payment equals or exceeds the standard 10-year payment, at which point staying on the IDR plan for forgiveness may not offer financial benefit.
How does IDR affect my credit score?
Making on-time IDR payments has a positive effect on your credit history just like any other loan payment. Enrolling in an IDR plan does not negatively impact your credit score. However, if your balance grows due to negative amortization, this increased debt could affect your debt-to-income ratio, which may influence future lending decisions like mortgages.
Conclusion
Choosing the right IDR plan requires comparing your monthly payment options against your long-term income outlook, career plans, and potential forgiveness benefits. This free income driven repayment IDR plan calculator gives you the side-by-side numbers you need to make a well-informed decision.
Always verify your eligibility and plan terms with your loan servicer, and consult a student loan specialist or financial advisor if you are weighing complex options like PSLF, tax-filing strategy changes, or whether refinancing to a private loan makes more sense for your situation.