Student Loan Repayment Calculator

Compare income-driven repayment plans, PSLF eligibility, and find the best strategy

About the Student Loan Repayment Calculator

Managing student debt requires more than just knowing your monthly balance; it requires a strategic look at how different federal and private repayment structures impact your long-term financial health. This Student Loan Repayment Calculator is designed for borrowers who need to compare the traditional 10-year standard plan against complex income-driven options like SAVE, PAYE, and IBR. By inputting your loan balance, interest rate, and annual income, you can visualize how different paths affect both your immediate cash flow and the total amount of interest you will pay over the life of the loan.

Beyond simple math, this tool assists borrowers in navigating the nuances of Public Service Loan Forgiveness (PSLF). Users can estimate their remaining balance at the end of a forgiveness period and determine if the lower payments of an IDR plan are worth the potentially higher interest costs over 20 or 25 years. Whether you are a recent graduate looking for the lowest possible payment or a mid-career professional trying to decide between aggressive refinancing and federal protection plans, this calculator provides the data necessary to make an informed choice.

Formula

Monthly Payment = (Loan Principal * (Monthly Interest Rate)) / (1 - (1 + Monthly Interest Rate)^-Number of Months)

For standard fixed plans, the formula uses the total loan balance, the annual interest rate divided by 12, and the total repayment term in months. For Income-Driven Repayment (IDR) plans, the payment is instead calculated as a percentage (usually 5%, 10%, or 15%) of your discretionary income divided by 12, regardless of the total loan balance.

Worked examples

Example 1: A graduate with $40,000 in federal loans at a 5% interest rate chooses a Standard 10-year Repayment Plan.

Principal: $40,000\nAnnual Rate: 5% (0.004167 monthly)\nTerm: 120 months\nCalculation: (40000 * 0.004167) / (1 - (1 + 0.004167)^-120)\nMonthly Payment: $423.97\nTotal Paid: $423.97 * 120 = $50,876.40

Result: $423.97 monthly payment and $10,876.40 total interest. This borrower pays off the debt in exactly 10 years.

Example 2: A borrower with $50,000 in debt earns $45,000 annually and uses an IDR plan set at 10% of discretionary income (where discretionary income is $15,000).

Annual Income: $45,000\nProtected Income: $30,000 (assumed 150% of poverty line)\nDiscretionary Income: $45,000 - $30,000 = $15,000\nAnnual Payment: 10% of $15,000 = $1,500\nMonthly Payment: $1,500 / 12 = $125

Result: $125 monthly payment with $37,500 eventually forgiven after 20 years. The borrower pays less monthly but carries debt much longer.

Common use cases

Determining if the SAVE plan will result in a $0 monthly payment based on current family size and income.
Comparing the total cost of a 10-year federal standard plan versus a private bank refinance at a lower interest rate.
Estimating how much debt will be forgiven after 120 payments while working for a 501(c)(3) non-profit organization.
Deciding whether to make extra principal payments to shorten the loan term or invest that capital elsewhere.

Pitfalls and limitations

Calculators often use current poverty guidelines which change annually, impacting future IDR payment estimates.
The tool cannot predict future legislative changes that might alter or eliminate specific forgiveness programs.
Estimates for married borrowers may be inaccurate if they choose to file taxes jointly versus separately, which changes the AGI used for calculations.
Private student loans do not qualify for IDR or PSLF, so including them in federal repayment models will yield incorrect results.

Frequently asked questions

how do i qualify for pslf student loan forgiveness

Public Service Loan Forgiveness (PSLF) requires you to work full-time for a qualifying non-profit or government employer while making 120 qualifying monthly payments under an income-driven repayment plan. After these 10 years of service, the remaining balance is forgiven tax-free.

is it better to use standard or income driven repayment

Standard plans usually result in the lowest total interest paid because you pay off the principal faster, typically over 10 years. IDR plans yield lower monthly payments and potential forgiveness, but interest can accumulate significantly over the 20 to 25-year term.

how is discretionary income calculated for student loans

Discretionary income is usually calculated as your Adjusted Gross Income (AGI) minus 150% or 225% of the federal poverty guideline for your family size. The specific percentage depends on whether you are on the SAVE, IBR, or PAYE plan.

which student loan plan has the lowest monthly payment

The SAVE plan (formerly REPAYE) generally offers the lowest payments because it uses a higher threshold for protected income and eliminates unpaid monthly interest, preventing your balance from growing even if your payment is $0.

do i have to pay taxes on forgiven student loans

While federal student loan forgiveness is currently tax-free through 2025 due to the American Rescue Plan Act, it may be treated as taxable income at the federal level after that date, and some states may still tax the forgiven amount regardless.