RAP vs IBR vs Standard: Five Real Borrowers, Run Through the Actual Math

Every number below was produced by our calculator using the payment formulas from the 2026 final regulations — assuming on-time payments, 3% annual income growth, and (where forgiveness occurs) a 25% combined tax rate on the forgiven amount. Change any assumption and the answer can flip, which is rather the point: no plan wins for everyone, and the margins run to five figures.

Example 1: Low income, modest debt — IBR wins even with the tax bomb

$25,000 balance at 6.39%, AGI $30,000, single, no dependents.

The surprise: RAP and IBR start at nearly identical payments (~$50), but they end in different places. IBR's payment stays tethered to income-above-poverty-line, so it grows slowly and hits 20-year forgiveness with $24,205 left — and even after paying ~$6,000 in tax on that forgiveness, IBR edges out RAP. The Standard plan is cheapest of all, but at $282/month it demands 5.6× the cash flow. This is the classic affordability-versus-total-cost trade.

Example 2: The teacher — Standard wins by $18,000

$42,000 at 6.39%, AGI $48,000, single, no dependents.

RAP's payment looks friendly at $160, but stretching a 6.39% loan across two decades costs $18,000 more than just amortizing it. One big caveat: if this teacher works in public service, PSLF changes everything — 120 qualifying payments on RAP or IBR and the balance is forgiven tax-free, making the low-payment plan the right call for entirely different reasons.

Example 3: Parent of two — a genuine three-way puzzle

$42,000 at 6.39%, AGI $48,000, two dependents, family of three.

Same income and debt as the teacher — but two dependents transform the picture. RAP's $50-per-dependent credit cuts its payment to $60; IBR's bigger family size (higher poverty-line deduction) cuts its payment to $58.50. Nearly identical monthly outlays, yet IBR ends up ~$12,000 cheaper in true cost despite a $12,000 tax bomb, because it forgives at 20 years while RAP grinds on to year 23. And Standard still nearly wins while costing $415 more per month. When the answer is this close, the deciding factors are the soft ones: can you actually sustain $475/month, and do you believe the tax rules will still be this harsh in 2046?

Example 4: The nurse with grad debt — don't stretch a 7.94% loan

$55,000 at 7.94% (grad unsubsidized), AGI $65,000, single.

At grad-loan interest rates, income-driven plans are expensive comfort: nobody reaches forgiveness, so the low payment is pure interest drag — $24,000 extra on RAP, $37,000 on IBR. The higher your rate, the stronger the case for Standard (or aggressive prepayment on any plan — RAP allows it, just opt out of due-date advancement so you keep the subsidies).

Example 5: High earner — RAP's 10% bracket bites

$80,000 at 7.94%, AGI $95,000, single.

Note the inversion: at $95,000 AGI, RAP (9% of all income) charges more per month than IBR (10% of income above $23,940). People assume RAP is always the cheaper payment; above roughly $80–90k for a single filer, it usually isn't. And at $100,001 AGI this borrower's RAP payment would jump another $83/month across the cliff. Standard wins on total cost again — income plans at high incomes mostly just add years.

What the five examples add up to

• Below ~$35k income: it's RAP's $10-floor affordability vs IBR's genuine $0 payments and shorter forgiveness. IBR often wins on total cost — check both.
• Middle incomes, no kids: if you can cash-flow the Standard payment, it's usually tens of thousands cheaper. Income plans are an affordability tool, not a discount.
• With dependents: RAP's credit and IBR's family-size deduction both kick in — the comparison gets close enough that assumptions decide it. Run your real numbers.
• High income or high rate: Standard, almost always — and watch RAP's bracket cliffs.
• Public service: PSLF rewrites every row above — pick the lowest qualifying payment and count to 120.