Federal student loan repayment options compared: standard, IDR, and PSLF

The eight repayment plans and their key parameters

Federal Direct Loan borrowers can choose among eight repayment plans under 20 USC 1087e and 34 CFR Part 685:

1. Standard Repayment: fixed payment over 10 years. Lowest total interest paid — the baseline for comparison.

2. Graduated Repayment: payments start low, increase every 2 years, over 10 years. Total interest higher than Standard but useful if income is expected to rise.

3. Extended Repayment: up to 25 years; requires $30,000+ balance. Fixed or graduated payment options. Significantly higher total interest than Standard.

4. Income-Based Repayment (IBR): 10% of discretionary income for new borrowers (post-July 2014); 15% for older borrowers. Forgiveness after 20 years (new) or 25 years (older borrowers).

5. Pay As You Earn (PAYE): 10% of discretionary income. Forgiveness after 20 years. Must be a new borrower as of October 1, 2007, AND have received a disbursement after October 1, 2011.

6. SAVE (Saving on a Valuable Education, formerly REPAYE): 5-10% of discretionary income (5% for undergraduate loans, 10% for graduate). Uses 225% of poverty line as income exclusion. Forgiveness timeline varies by balance. Interest subsidy: unpaid interest is covered by the government.

7. Income-Contingent Repayment (ICR): 20% of discretionary income or fixed 12-year payment amount, whichever is less. Available to all Direct Loan borrowers. Forgiveness after 25 years.

8. PSLF Track: Not a separate plan — PSLF requires making 120 qualifying payments under a qualifying plan (usually an IDR plan) while working full-time for a qualifying employer.

How discretionary income is calculated: the math behind IDR payments

Discretionary income is the foundation of all IDR payment calculations. The formula:

Discretionary income = AGI − (Poverty guideline × Applicable multiplier)

By plan: - SAVE: 225% of federal poverty guideline - IBR, PAYE, ICR: 150% of federal poverty guideline

2024 federal poverty guidelines (48 contiguous states): - Family of 1: $15,060 - Family of 2: $20,440 - Family of 3: $25,820 - Family of 4: $31,200 (Hawaii and Alaska have higher guidelines)

Example: Single borrower, $55,000 AGI, SAVE plan: Discretionary income = $55,000 - (2.25 × $15,060) = $55,000 - $33,885 = $21,115 Monthly payment = 5% × $21,115 / 12 = $88.06/month (for undergraduate loans)

Same borrower on IBR: Discretionary income = $55,000 - (1.50 × $15,060) = $55,000 - $22,590 = $32,410 Monthly payment = 10% × $32,410 / 12 = $270.08/month

The SAVE plan's higher income exclusion (225% vs 150% of poverty line) is why its payments are significantly lower — for this borrower, 67% lower than IBR.

The forgiveness tax bomb: planning for IDR forgiveness

Under current law, IDR forgiveness (at 20-25 years depending on plan) is treated as ordinary income in the year of forgiveness. This is the 'tax bomb' — a potentially large tax bill in a single year.

Example: $80,000 balance remaining at 20-year PAYE forgiveness, 28% marginal bracket = $22,400 federal tax due. Plus state income tax in most states.

This changes the total cost calculation significantly. A borrower who pays $150/month for 20 years ($36,000 total) and then owes $22,400 in taxes has a true total cost of $58,400 — not just $36,000.

Planning strategies: (1) Tax-advantaged savings during IDR years specifically earmarked for the forgiveness tax liability. (2) PSLF track (10 years, tax-free forgiveness) for public sector borrowers. (3) Monitor legislative changes — several proposals have been introduced to make IDR forgiveness tax-free (ARP 2021 provided temporary federal tax exclusion through 2025; future legislation uncertain).

The Student Loan Payoff Calculator models your projected forgiven balance and estimated tax liability at the forgiveness date so you can plan accordingly.

When to consider refinancing to a private loan

Refinancing federal student loans to private permanently and irrevocably removes access to IDR plans, PSLF, and federal forgiveness. This is a one-way door.

Refinancing makes mathematical sense only if: (1) You have high, stable income with no forgiveness trajectory — you'll pay off the loan regardless of plan. (2) Your current federal rate is significantly above available private rates. (3) You don't qualify for PSLF (private sector work). (4) Your income is too high for IDR to reduce your payment below what Standard would be anyway.

Refinancing is usually a mistake if: (1) You're on a PSLF track — refinancing to private immediately disqualifies you. (2) Your income is variable or may drop (private loans have no income-driven fallback). (3) You anticipate a major life event (disability, layoff, return to school) where federal forbearance would be valuable. (4) Any realistic forgiveness scenario produces more value than the interest savings from a lower private rate.

The Student Loan Payoff Calculator computes the break-even private rate at which refinancing beats the federal IDR path for your specific balance and income trajectory.

Primary sources cited

• 20 USC 1087e — Federal Direct Loan Program
• 34 CFR Part 685 — William D. Ford Direct Loan Program
• Federal Student Aid — Repayment Plans