Income-Based Repayment Calculator: What You Will Pay on Each Federal Plan

Income-driven repayment (IDR) plans set your federal student loan payment as a percentage of your income, not your loan balance. For borrowers whose standard payment exceeds what income supports, these plans can cut payments by 50-90%.

Understanding which plan applies to you and how to calculate payments determines whether you will be paying $920/month or $135/month on the same $80,000 in loans.

The Four Federal IDR Plans (2026)

| Plan | Payment | Forgiveness | |------|---------|------------| | SAVE (replaces REPAYE) | 5% of discretionary income (undergrad) / 10% (grad) | 10-20 years | | PAYE | 10% of discretionary income | 20 years | | IBR (new borrowers) | 10% of discretionary income | 20 years | | IBR (older borrowers) | 15% of discretionary income | 25 years | | ICR | 20% of discretionary income | 25 years |

SAVE is the newest and most generous plan for most borrowers. It replaced REPAYE in 2023.

How Discretionary Income Is Calculated

Every IDR plan defines "discretionary income" differently. SAVE uses:

SAVE discretionary income = Adjusted Gross Income - (225% × Federal Poverty Line)

2026 Federal Poverty Line (FPL) for a single person: approximately $15,650.

225% of FPL = $35,213.

Single borrower, $50,000 AGI:

SAVE discretionary income = $50,000 - $35,213 = $14,787

SAVE annual payment (undergraduate loans): $14,787 × 5% = $739/year = $61.58/month

PAYE/IBR annual payment (10%): $14,787 × 10% = $1,479/year = $123.25/month

Side-by-Side at Different Income Levels

$80,000 in undergraduate federal student loans, single filer:

| Income | SAVE (5%) | PAYE/IBR (10%) | Standard (10yr) | |--------|----------|----------------|----------------| | $35,000 | $0 | $0 | $920 | | $45,000 | $25 | $50 | $920 | | $55,000 | $82 | $163 | $920 | | $65,000 | $138 | $276 | $920 | | $75,000 | $194 | $388 | $920 | | $85,000 | $249 | $498 | $920 | | $100,000 | $327 | $653 | $920 |

At $65,000 income, SAVE cuts the payment from $920 to $138/month — an $85% reduction.

When IDR Makes Sense

High debt-to-income ratio. If monthly standard payment exceeds 10-15% of gross income, IDR provides meaningful relief. The $920 payment on $80,000 in loans is unsustainable at $50,000 income without IDR.

PSLF track. If you qualify for Public Service Loan Forgiveness (10 years at a government or nonprofit employer), IDR minimizes payments while the clock runs toward forgiveness. Paying extra on PSLF loans is financially counterproductive.

Temporary income reduction. Starting a business, taking a career break, or in a lower-income period. IDR adjusts payments with income.

Very high loan balances. If you have $200,000+ in graduate school debt on a $80,000 income, the standard payment is impossible. IDR plans are designed for exactly this scenario.

When IDR Hurts You

If income is high and loans are small. A $40,000 borrower at $120,000 income has an IDR payment nearly equal to the standard payment. No benefit.

For private loans. IDR plans only apply to federal student loans. Private loans require their own repayment strategy.

If you want to pay off quickly. IDR plans extend loan terms to 20-25 years. You will pay more total interest than on the standard 10-year plan.

If forgiveness is taxable. Non-PSLF forgiveness (after 20-25 years on IDR) is taxable as ordinary income in the year forgiven. A $100,000 forgiven balance at 32% bracket = $32,000 tax bill. The "tax bomb" requires planning.

SAVE Plan Interest Subsidy

SAVE has a unique provision: if your payment does not cover all accruing interest, the government covers the difference. Your balance does not grow.

Example:

• $80,000 at 5.5% interest = $367/month accruing interest
• SAVE payment at $45,000 income = $25/month
• Government covers: $342/month

Without SAVE (or previous REPAYE), unpaid interest would capitalize and the balance would grow, creating a larger forgiveness amount or a larger debt if you eventually earn more.

With SAVE, the balance stays at $80,000 regardless of how low the payment is.

Enrollment and Annual Recertification

To enroll: studentaid.gov → Income-Driven Repayment → select plan → provide income information.

You must recertify annually. Your payment is recalculated based on the previous year's tax return income. Missing recertification causes the payment to revert to the standard amount.

Annual recertification strategy:

• File taxes early → recertify early → lower payment for more of the year
• If income dropped this year, recertify using current income vs. prior year
• In high-income years, recertify late to extend the lower-payment period from the previous year

Frequently Asked Questions

Can I switch between IDR plans?

Yes. You can switch plans as your situation changes. Switching from PAYE to SAVE, for example, may lower payments. Switching resets any forgiveness progress that is plan-specific (some forgiveness tracking is loan-specific, not plan-specific).

Does IDR affect my credit score?

No. Making required IDR payments is on-time payment behavior. There is no credit score penalty for being on an IDR plan.

What if I get married and file jointly?

Joint filing increases combined income for IDR calculations, potentially raising payments. Some couples benefit from married filing separately to keep payments lower, though this affects other taxes. Run both scenarios. SAVE specifically uses only the borrower's income for payments if the couple files separately.