| Scenario | Balance | AGI | Family Size | Rate | Borrower Type | Estimated Use |
|---|---|---|---|---|---|---|
| Single graduate | $45,000 | $52,000 | 3 | 6.50% | New borrower | Compare affordable payment with standard cap. |
| Married joint filing | $70,000 | $78,000 | 4 | 7.00% | Older borrower | Estimate spouse income and loan allocation. |
| Low income household | $28,000 | $31,000 | 2 | 5.80% | New borrower | Review zero or low discretionary income. |
Poverty allowance: Poverty guideline × 150%.
Discretionary income: Adjusted gross income − poverty allowance.
IBR annual payment: Discretionary income × 10% for new borrowers, or × 15% for older borrowers.
Monthly IBR payment: IBR annual payment ÷ 12.
Standard cap: Monthly amortized payment for the selected standard term.
Final estimated payment: Lower of raw IBR and standard cap, then adjusted for joint borrower loan share when used.
Balance projection: Beginning balance + monthly interest − monthly payment. Income and poverty guideline values may grow each year.
- Enter your current eligible federal student loan balance.
- Add your adjusted gross income from your latest tax information.
- Choose family size, region, filing status, and borrower category.
- Enter the interest rate and standard repayment term for comparison.
- Use growth fields to model future income and poverty guideline changes.
- Press calculate and review the result block above the form.
- Download the CSV or PDF for your planning file.
This tool is educational. Confirm eligibility, income documentation, and payment rules with your loan servicer.
Why IBR Matters
Income based repayment can make federal student loan bills easier to manage. The plan connects payment size to income and family size. It helps borrowers who cannot afford a full standard payment. The calculator estimates that payment and shows the long term balance effect.
Income and Family Size
The main input is adjusted gross income. Family size also matters because it changes the poverty guideline allowance. A larger family usually means a larger protected income amount. When protected income rises, discretionary income falls. That often lowers the monthly payment.
New and Older Borrowers
IBR has different percentages for different borrower groups. New borrowers usually use ten percent of discretionary income. Older borrowers usually use fifteen percent. The forgiveness timeline may also differ. This page lets you switch between both paths quickly.
Standard Payment Cap
IBR is designed to prevent the required payment from exceeding the standard plan amount. The cap can become important when income rises. If income grows fast, the payment may reach the cap. The calculator compares the raw income based amount with the standard amortized payment.
Interest and Balance Risk
A low payment can help cash flow. It may also fail to cover monthly interest. When that happens, the projected balance can grow. This is called negative amortization in many planning tools. The estimate shows the interest gap so you can see that risk.
Forgiveness View
The remaining balance may be forgiven after the required period. The projection applies monthly payments until payoff or the forgiveness month. It then estimates any remaining balance. Tax treatment and program rules can change, so use this as a planning estimate only.
Better Decisions
Use several scenarios before making a repayment choice. Try lower income, higher income, joint filing, separate filing, and different family sizes. Compare total paid, balance growth, and the standard cap. A small input change can create a very different repayment path.
What does this calculator estimate?
It estimates monthly IBR payment, discretionary income, standard payment cap, projected balance, total paid, and possible forgiveness balance using the inputs you provide.
Is this an official loan servicer calculation?
No. It is an educational planning tool. Your servicer may use exact certification dates, loan types, subsidies, capitalization limits, and updated federal rules.
Why can the payment be zero?
The payment can be zero when adjusted gross income is less than or equal to 150% of the poverty guideline for the selected family size and region.
What is discretionary income?
For this estimate, discretionary income is adjusted gross income minus 150% of the poverty guideline. Negative values are treated as zero.
Why does marital filing status matter?
Joint filing can include spouse income and spouse loans. Separate filing usually uses only borrower income, but personal tax effects should be reviewed separately.
What is the standard payment cap?
It is the estimated fixed monthly payment on the selected standard repayment term. IBR payment is generally limited by this amount.
Why does the balance grow?
The balance may grow when the monthly payment is less than monthly interest. This tool can show that unpaid interest as projected balance growth.
Can I use this for private student loans?
Private loans usually do not follow federal IBR rules. Use this only for federal planning, then confirm details with the loan holder.