US Federal Student Loans: RAP, IBR, PAYE, and PSLF

The One Big Beautiful Bill Act establishes the Repayment Assistance Plan (RAP) as the primary income-driven repayment framework for many borrowers. RAP uses AGI brackets that each apply a percentage rate (1%–10%) to your TOTAL adjusted gross income — not a fixed dollar payment schedule and not the older discretionary-income formula used by IBR/PAYE/ICR. Crossing a bracket boundary can create a payment cliff because the higher rate applies to all of your AGI.

Because RAP uses discrete brackets rather than a smooth formula, earning even $1 above a bracket threshold can trigger a significant payment increase. This "cliff effect" creates situations where a raise or bonus could cost you more in loan payments than the extra income is worth. Strategic use of pre-tax deductions (401(k), HSA, traditional IRA) can keep your AGI within a favorable bracket.

Income-Based Repayment is the most widely accessible income-driven repayment plan post-OBBBA. New borrowers (first loan on or after July 1, 2014) pay 10% of discretionary income with forgiveness after 20 years. Older borrowers pay 15% with forgiveness after 25 years. Discretionary income is calculated as your AGI minus 150% of the Federal Poverty Level for your household size — a fundamentally different calculation from RAP's gross-AGI brackets.

The critical drawback of IBR is the capitalization trap. When you leave IBR for another plan, all accumulated unpaid interest is permanently added to your principal balance. For SAVE-displaced borrowers using IBR as a bridge to RAP, this means months of accrued interest from the SAVE forbearance period could inflate your loan balance by thousands. This makes IBR a costly bridge unless you plan to stay permanently.

Pay As You Earn (PAYE) charges 10% of discretionary income — the same rate as IBR for new borrowers — but with one critical advantage: PAYE does not capitalize unpaid interest when you exit to another plan. This makes it the ideal bridge plan for SAVE-displaced borrowers who are eligible and want to transition to RAP without inflating their principal balance.

However, PAYE has strict eligibility requirements: you must have taken your first federal student loan on or after October 1, 2007, and must have received a loan disbursement on or after October 1, 2011. PAYE closed to new enrollment on July 1, 2026. Borrowers already enrolled may remain until the July 1, 2028 sunset, then must transition to another plan (likely RAP or IBR).

Interest capitalization is when unpaid accrued interest is permanently added to your loan principal. This means you start paying interest on your interest — a compounding effect that can add thousands to your total loan cost. Under the OBBBA transition, SAVE-displaced borrowers face a specific capitalization risk when using IBR as a bridge to RAP.

During the SAVE administrative forbearance (August 2025 onward), interest continues accruing on your loans but no payments are due. If you enroll in IBR as a bridge plan and then exit to RAP when it launches in July 2026, all that accrued interest gets capitalized — permanently added to your balance. On an $80,000 loan at 6%, six months of forbearance generates roughly $2,400 in interest. After capitalization, you owe $82,400 and pay interest on the full inflated amount for the remaining 20-30 years.

To avoid this trap, consider PAYE (if eligible — no capitalization on exit), waiting in forbearance for RAP (lose qualifying months but avoid capitalization), or staying in IBR permanently (no exit capitalization event).

Public Service Loan Forgiveness requires 120 qualifying monthly payments while working for an eligible employer. Every month spent in SAVE administrative forbearance counts as zero qualifying payments — potentially adding years to your PSLF timeline. The buyback provision allows borrowers to make lump-sum payments to recover these lost months, but the cost is calculated using your current plan's payment formula, not the $0 payments you would have made under SAVE.

For public sector workers, the math is critical: each lost month delays your tax-free forgiveness by one month and costs you one additional month of regular payments. If you have 96 qualifying payments and lost 12 months to forbearance, buyback gets you to 108 payments (12 remaining) versus restarting from 96 (24 remaining). The buyback lump sum is 12 × your monthly payment under your current plan. At a $300/month IBR payment, that's $3,600 — but it saves you 12 months of payments ($3,600) plus delays in receiving tax-free forgiveness on your remaining balance.

When your student loan balance is forgiven through an income-driven repayment plan after 20-30 years, the IRS treats the forgiven amount as taxable income. This creates a potential "tax bomb" — a large, unexpected tax bill in the year of forgiveness. Starting January 1, 2026, this tax treatment is fully in effect for all new IDR forgiveness events.

The impact can be severe. A borrower with $150,000 forgiven at an estimated AGI of $75,000 would have total taxable income of $225,000 in the forgiveness year. At 2026 tax rates, the additional federal tax on the forgiven amount could exceed $35,000. State income taxes may add another $5,000-$15,000 depending on your state.

The only exceptions are PSLF forgiveness (completely tax-free) and certain disability discharges. For everyone else, the critical strategy is to start saving early. A tax bomb savings fund earning 4% APY over 20 years can dramatically reduce the monthly savings required. Roth IRA contributions can serve double duty — growing tax-free while providing funds to cover the eventual tax bill.