How does the SAVE interest subsidy work?

If your required monthly payment is less than the interest that accrues that month, the federal government pays the remaining interest. Your total loan balance will never grow as long as you make your monthly SAVE payment.

Updated: August 2026 • Verified v1.2

Student Loan IDR & SAVE Repayment Plan Calculator

Finance & MathPopular

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Discretionary = Max(0, AGI - 2.25 * PovertyLine); Monthly_Payment = (Discretionary * Rate) / 12

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Understanding Your Results

Calculates monthly IDR/SAVE payment, monthly savings compared to the standard 10-year plan, protected income under 225% of Federal Poverty Guidelines, and monthly unpaid interest waived by the government.

Practical Guidance & Next Steps

Under the SAVE plan, if your monthly payment is $30 but your loan accrues $150 in monthly interest, the remaining $120 is completely waived by the government, preventing your loan balance from ballooning.

What is this?

A personal finance utility that calculates monthly payments and interest subsidies under federal Income-Driven Repayment (IDR / SAVE) plans.

How does it work?

1. Enter Adjusted Gross Income (AGI), family size, and total student debt. 2. Select loan type (Undergrad 5% cap, Graduate 10% cap, or Split). 3. View IDR monthly payment, standard 10-year comparison, and waived interest.

Why use it?

Delivers accurate cash-flow estimates for federal student loan planning without logging into government portals.

Technical Scope & Calculation Limitations

Models Federal Poverty Guidelines and Department of Education SAVE formula.

Frequently Asked Questions

The SAVE (Saving on a Valuable Education) plan is an income-driven repayment plan that protects more income from payment calculations (225% of the federal poverty line), cuts undergraduate monthly payments in half (to 5% of discretionary income), and eliminates unpaid interest accumulation.

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