Comprehensive Guide
Learn more in our Loans & Mortgage Guide.
How it works
Discretionary income, in the federal student-loan sense, is the slice of earnings an income-driven repayment formula treats as available for loan payments — conventionally defined as everything you earn above a threshold tied to the poverty guideline for your household size. Plans then charge a fixed percentage of that slice rather than of your full income, which is why payments stay proportionate when incomes are small: someone earning $62,000 against an illustrative $24,300 threshold has about $37,700 counted, and a plan charging a tenth of it lands near $314 a month — under seven percent of gross pay. The rules behind both halves of that equation — the threshold multiple and the percentage charged — have been rewritten repeatedly, which is why this estimator keeps both visible as inputs and labels its defaults illustrative rather than authoritative. Use it to understand the shape of the formula and to sanity-check any servicer quote: if a quoted payment cannot be reconstructed from your income, a threshold, and a share, something in the inputs — household size, income documentation, or plan choice — differs from what you assumed. Confirm the live formula at StudentAid.gov before relying on any number here.Formula
Discretionary income = max(0, gross annual income − threshold) | Illustrative payment = discretionary ÷ 12 × plan share %
Tips
- Household size moves the threshold more than anything else — count everyone you support.
- Recalculate after every raise; income-driven payments follow documented income annually.
- Compare the result against the standard 10-year payment to see what the trade costs in timeline.
- Treat the output as directional — plan formulas change, so verify at StudentAid.gov.
- If a quoted payment seems high, recheck which income years the servicer is counting.
Frequently asked questions
What counts as discretionary income for student loans?
Generally the amount your adjusted gross income exceeds a threshold tied to the federal poverty guideline for your family size. On an illustrative $62,000 income against a $24,300 threshold, about $37,700 counts. Exact multiples differ by plan and have changed over time — confirm the current definition at StudentAid.gov.
How is an income-driven payment calculated?
Plans charge a set percentage of discretionary income, split into twelve monthly installments. At a ten-percent-style share on the example above, that runs near $314 monthly. Because shares and thresholds vary by plan and revision year, treat any estimate — including this one — as educational rather than a quote.
Why did my income-driven payment go up?
Payments track your documented income annually: a raise, a spouse's income on a joint filing, or expiring recertification paperwork can all lift the figure. Re-run your income through the formula and compare against the servicer's numbers before assuming an error.
Is discretionary income the same as disposable income?
No. Disposable income is what remains after taxes; discretionary income in the loan sense is a regulatory construct — income above a poverty-guideline-linked threshold. They diverge sharply: a renter in a high-cost city may have thin disposable income yet still show substantial loan-program discretionary income.
Do I have to recertify my income every year?
Yes — income-driven plans require annual recertification, and missing it typically resets the payment to the full standard amount until documents arrive. Calendar the deadline thirty days early; a missed window is the most common cause of payment shocks reported by borrowers.