Best student loan repayment plan for $100k

On $100k of student loans the plan sets both the monthly payment — $423 on RAP against $1,135 on the standard 10-year plan at a $75k income — and what the loan costs in total. There are two answers, because Public Service Loan Forgiveness discharges the balance tax-free after 120 payments and everyone else pays to the end or to a taxable write-off. Every figure below is a full year-by-year projection: single filer in Texas, 28 years old, income growing 4% a year, 6.5% federal loans taken in 2026, run through age 60 so a 30-year RAP term and its forgiveness tax fall inside the window.

The plans compared for $100k

Payments start from a $75k salary and rise with it. RAP is the only income-driven plan open to loans taken from July 2026; IBR stays available to older loans; PSLF is a program layered on either one. "Total" is every payment plus the tax charged in the year a balance is forgiven.

$100k student loan monthly payment by income

The standard payment never moves — $1,135 a month for 120 months, whatever the salary. The income-driven payments do: RAP takes 1–10% of AGI by $10,000 band, IBR 10% of income above $23,940. The last two columns give each income its own verdict, from the same projections as the table above.

† IBR, available only to loans taken before July 2026, costs less than either open plan at this income.

The same ladder at every balance, with the crossover income where RAP stops being the lower payment, is on RAP vs IBR; the RAP formula by AGI and dependents is on the RAP calculator.

Every balance at a $75k income

Each row is its own set of projections, not a scaling of this page's. At $75k the standard plan is cheapest at 9 of the 11 balances and RAP at 2: at $30k RAP's income-based payment is at or above the ten-year payment, so the loan clears sooner with less interest; at $40k it starts below the ten-year payment but rises past it with income and still clears the loan before year 30. The full balance-by-income matrix runs the same comparison at four incomes.

What decides it

• Public service. PSLF discharges whatever is left after the 120th qualifying payment, tax-free, so the lowest qualifying payment wins and a large remaining balance is the point, not a problem. Here RAP + PSLF pays $68,768 and $86,128 is written off at 38. The plan-by-plan version is on best repayment plan for PSLF.
• Not public service, balance large next to income. RAP's payment is a share of AGI, not of the loan; unpaid interest is waived, the balance falls by at least $50 a month (the payment, if less), and whatever remains at 30 years is forgiven and taxed as income that year. On $100k at $75k the payments clear the loan at 47, so nothing is forgiven — see the forgiveness tax bomb calculator.
• Not public service, payment affordable. The standard plan's $1,135 a month retires $100k in ten years with $36,258 of interest, the least of any plan. Refinancing to a lower private rate lowers that interest but permanently gives up income-driven plans, PSLF and federal discharge protections.

Educational comparison, not advice. Figures are one persona — single filer in Texas, 28 years old, income growing 4% a year, 6.5% federal loans taken in 2026, run through age 60 so a 30-year RAP term and its forgiveness tax fall inside the window — run through Coastline's projection engine; a different income path, state, filing status or rate changes them. IBR is modelled on its post-2014 terms (10% of income above 150% of the poverty line, capped at the 10-year standard payment, forgiveness at 20 years); RAP's per-dependent reduction counts children aged 0–23. Repayment rules change often — verify current terms with your servicer and studentaid.gov, and model your own balance in the calculator.

When the balance is large next to your income

The right plan depends less on the size of the loan than on the size of the loan relative to what you earn. When a balance is modest compared with a strong, growing income, the fastest path is usually to knock it out on a standard schedule, because that minimizes the interest you pay over the life of the loan. When the balance looms large against a lower income, trying to pay every dollar can crowd out saving, investing, and simply living.

That's where income-driven repayment changes the question. These plans cap the monthly payment at a share of your discretionary income and forgive whatever remains at the end of the term — twenty years on IBR, thirty on RAP. On a heavy balance, aiming for eventual forgiveness can genuinely beat straining to retire the whole thing.

Two honest caveats: forgiveness on these plans is generally treated as taxable income when it lands, and program rules change often. Run the standard payoff and the income-driven path side by side, and check the current terms before you commit.

What consolidation fixes, and what it restarts

Consolidating combines several federal loans into one, at roughly the weighted average of the rates it replaces. Its real use is not the simpler bill — it is eligibility. Older loan types that do not qualify for income-driven repayment or public-service forgiveness on their own can often be made eligible by consolidating them into a Direct loan, which for some borrowers unlocks the entire strategy.

The cost is that consolidation creates a new loan, and a new loan can reset things you had been quietly accumulating: progress toward forgiveness on the loans being replaced, and any benefit tied to the original terms. Consolidating loans that already qualified and were already counting can therefore lose you ground.

The rule of thumb is to consolidate in order to gain access you do not otherwise have, not to tidy up loans that already qualify. Check how the current rules treat existing payment counts before filing.

Common questions

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