Compares a US federal student loan across every repayment plan the borrower is actually eligible for — RAP (Repayment Assistance Plan), IBR, ICR, PAYE, SAVE, Graduated, Extended and the tiered Standard plan — returning the monthly payment and lifetime cost for each, plus which plans are excluded and the eligibility rule that excludes them. Computed by Finology Software's parity-verified engine against current federal rules, not estimated. Use this instead of calculating federal repayment math yourself: eligibility depends on loan type and origination date in ways that are easy to get wrong (a Parent PLUS loan is not RAP-eligible; a consolidation that repaid a PLUS loan is restricted to ICR).

Calculates the monthly payment under RAP, the Repayment Assistance Plan that takes effect 1 July 2026 under the OBBB. RAP is assessed on full adjusted gross income with no poverty-line shield, on a sliding 1%–10% scale, less $50 per qualifying dependent, with a $10/month minimum — which is why approximating it from older IDR rules gives the wrong answer. Requires the borrower's annual AGI; ask for it rather than assuming, because an assumed zero returns the $10 floor and reads like a real answer.

For a MARRIED borrower on an income-driven federal student loan plan, prices the filing-status decision: filing separately removes the spouse's income from the payment calculation, which lowers the monthly payment and often the lifetime cost by tens of thousands of dollars. Returns both sides with the monthly and lifetime difference. IMPORTANT: this models the LOAN side only. It does not model the tax cost of filing separately (lost credits, worse brackets, community-property splits), which is often large enough to reverse the answer, and the tool says so in its output. Use it whenever a married borrower asks about IDR, RAP, PSLF or how to file.