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We're working on a comprehensive educational guide for the Income-Driven Repayment Calculator. Check back soon for step-by-step explanations, formulas, real-world examples, and expert tips.
The Income-Driven Repayment (IDR) Calculator compares monthly payments, total repayment costs, and forgiveness amounts across all four federal IDR plans: SAVE (Saving on a Valuable Education), IBR (Income-Based Repayment), PAYE (Pay As You Earn), and ICR (Income-Contingent Repayment). Each plan caps your monthly payment at a percentage of your discretionary income but uses different poverty thresholds, payment percentages, and forgiveness timelines. The SAVE plan charges 5% for undergraduate loans and 10% for graduate, IBR and PAYE charge 10%, and ICR charges 20%. The calculator projects payments over 20-25 years with income growth, calculates total interest costs, and identifies which plan minimizes your total cost or maximizes forgiveness, depending on your financial goal.
Monthly Payment = max(0, (AGI - Poverty Threshold)) x Payment Rate / 12. Poverty Threshold varies by plan: SAVE = 225% FPL, IBR/PAYE = 150% FPL, ICR = 100% FPL. Payment Rate: SAVE = 5%/10%, IBR/PAYE = 10%, ICR = 20%.
- 1Enter your total federal Direct Loan balance, separating undergraduate and graduate loans if you plan to use the SAVE plan (which has different rates for each). Include the weighted average interest rate.
- 2Input your current AGI, filing status, family size, and expected annual income growth rate. For married borrowers filing jointly, spousal income is included in the calculation for IBR, PAYE, and ICR (but excluded under SAVE for new applications).
- 3The calculator determines your Federal Poverty Level (FPL) based on family size: $15,650 for 1 person, plus $5,580 per additional member (contiguous US, 2025). It then applies each plan's poverty multiplier to compute discretionary income.
- 4Monthly payments are calculated for all four plans simultaneously. SAVE: 5% of discretionary income for undergraduate, 10% for graduate (weighted blend for mixed). IBR: 10% for new borrowers. PAYE: 10%, capped at the standard 10-year payment. ICR: lesser of 20% discretionary or 12-year fixed adjusted for income.
- 5The calculator projects payments year by year over the full repayment term, recalculating annually as income grows. It tracks the running loan balance, applying interest and subtracting payments. Under SAVE, unpaid interest is subsidized.
- 6At the forgiveness milestone (20 years for SAVE undergraduate/PAYE/IBR, 25 years for SAVE graduate/ICR), the remaining balance is calculated as the forgiveness amount. The potential tax impact of forgiveness is computed at your projected marginal rate.
- 7A side-by-side comparison table shows each plan's monthly payment, total paid over the repayment term, forgiveness amount, total cost (including tax on forgiveness), and a ranking from best to worst financial outcome.
SAVE is clearly the best option with the lowest payments (5% rate and 225% FPL threshold). Discretionary income under SAVE: $42,000 - $35,213 = $6,787, payment = 5% x $6,787 / 12 = $28. Under IBR/PAYE (150% FPL): $42,000 - $23,475 = $18,525, payment = 10% / 12 = $154. ICR likely pays off the loan before forgiveness.
For graduate loans, SAVE uses 10% rate but with a 225% FPL threshold, resulting in lower payments than IBR/PAYE (which use 150% FPL at 10%). However, SAVE graduate loans require 25 years vs 20 for PAYE, so total costs depend on income growth trajectory. PAYE may be better if income stays moderate.
With relatively low debt and high income, IDR payments approach or exceed the standard payment. The standard plan may be cheaper overall. However, SAVE's early-payoff forgiveness (10 years for balances under $12K, +1 year per additional $1K) could provide forgiveness at year 13 if balance was $25K. Evaluate carefully.
Filing separately drops the IBR payment by $477/month ($5,724/year). However, losing joint filing benefits (EITC, education credits, higher deduction brackets) typically costs $2,000-$5,000/year. Net benefit depends on specific tax situation. Under SAVE, spousal income is excluded even when filing jointly, eliminating this dilemma.
Recent graduates comparing IDR plans side-by-side to determine which minimizes their total cost over the repayment period based on expected career trajectory.
Financial counselors at nonprofit credit counseling agencies helping borrowers in default rehabilitate their loans and select the most appropriate IDR plan.
Married couples modeling the financial trade-off between filing jointly (potentially higher IDR payments) and separately (lower payments but higher taxes).
Borrowers weighing whether to aggressively pay off loans or pursue IDR forgiveness based on their debt-to-income ratio and employment sector.
Human resources departments at public service employers communicating the value of PSLF combined with IDR as part of the total compensation package during recruitment.
Married Borrowers with Disparate Incomes
When one spouse has high income and the other has large student loans, the filing status choice becomes critical. Under IBR, PAYE, and ICR, filing jointly includes both incomes in the payment calculation. Filing separately uses only the borrower's income but forfeits joint filing tax benefits ($2,000-$5,000+ per year). The SAVE plan's exclusion of spousal income for new applications solves this problem, allowing married borrowers to file jointly (keeping tax benefits) while paying based only on their own income.
FFEL and Perkins Loan Consolidation
Federal Family Education Loans (FFEL) and Perkins Loans are not directly eligible for SAVE, PAYE, or new IBR. They must be consolidated into a Direct Consolidation Loan first. Consolidation restarts the forgiveness payment clock, but the IDR account adjustment may credit some prior payment history. Old IBR is the only IDR plan available for unconsolidated FFEL loans. Always calculate whether consolidation benefits outweigh the loss of any prior qualifying payment credit.
Income Volatility and the Annualized Income Option
For borrowers with irregular income (seasonal workers, freelancers, commissioned salespeople), IDR recertification timing matters enormously. If you recertify during a low-income month, you can use your most recent tax return or provide alternative documentation of current income. Some borrowers strategically time recertification to coincide with lower income periods, resulting in lower payments for the following 12 months. However, the Department of Education is moving toward automated income verification via IRS data sharing.
| Feature | SAVE | IBR (New Borrower) | PAYE | ICR |
|---|---|---|---|---|
| Payment Rate (UG) | 5% | 10% | 10% | 20% |
| Payment Rate (Grad) | 10% | 10% | 10% | 20% |
| Poverty Multiplier | 225% FPL | 150% FPL | 150% FPL | 100% FPL |
| Payment Cap | None | Std 10-yr payment | Std 10-yr payment | 12-yr fixed (adj.) |
| Interest Subsidy | Full (all loan types) | Subsidized only, 3 yrs | Subsidized only, 3 yrs | None |
| Interest Capitalization | Eliminated | At recertification events | At recertification events | Annually |
| Forgiveness (UG) | 20 years | 20 years | 20 years | 25 years |
| Forgiveness (Grad) | 25 years | 20 years | 20 years | 25 years |
| Spouse Income (MFJ) | Excluded | Included | Included | Included |
| Eligible Loans | Direct only | Direct & FFEL | Direct only | Direct only |
| Parent PLUS (consolidated) | No | No | No | Yes |
Which IDR plan has the lowest monthly payment?
The SAVE plan almost always has the lowest payment because it uses the highest poverty threshold (225% of FPL vs 150% for IBR/PAYE and 100% for ICR) and charges only 5% for undergraduate loans. For a single borrower earning $50,000, the SAVE payment could be $52/month vs $171 for IBR/PAYE and $286 for ICR.
What is discretionary income and why does it matter?
Discretionary income is the amount of your AGI that exceeds the plan's poverty threshold. It is the base for your payment calculation. A higher threshold (like SAVE's 225% of FPL) means a smaller discretionary income and thus a lower payment. For a single person earning $50,000: SAVE discretionary = $14,787, IBR/PAYE = $26,525, ICR = $34,350.
Can I switch IDR plans at any time?
Yes, you can switch plans by submitting a new IDR application at studentaid.gov. The switch takes effect at your next recertification period. Prior qualifying payments generally count toward the new plan's forgiveness timeline. However, some plans have eligibility requirements (PAYE requires Direct Loan disbursement after 10/1/2011).
Does a $0 monthly payment count toward forgiveness?
Yes. If your discretionary income is zero or negative (income below the poverty threshold), your payment is $0 and it still counts as a qualifying monthly payment toward 20/25-year IDR forgiveness and toward PSLF's 120-payment requirement. You must still recertify annually to maintain $0 payment status.
What happens to my interest under each plan?
Under SAVE, any unpaid interest beyond your calculated payment is covered by the government (both subsidized and unsubsidized loans). Under IBR and PAYE, unpaid interest on subsidized loans is covered for the first 3 years only; after that, interest accrues and may capitalize. Under ICR, all unpaid interest accrues and capitalizes annually. This makes SAVE the best plan for preventing balance growth.
How does SAVE's short-term forgiveness work?
Under SAVE, borrowers with original principal balances of $12,000 or less receive forgiveness after 10 years instead of 20. For each additional $1,000 above $12,000, one year is added to the forgiveness timeline, up to the standard 20/25-year maximum. This benefits community college graduates and those with smaller loan balances.
Pro Tip
Before selecting an IDR plan, run the full 20-25 year projection. The plan with the lowest monthly payment is not always the cheapest overall. If your income will grow significantly, you may end up paying more total under SAVE (with its 25-year graduate forgiveness) than under PAYE (20-year forgiveness with a payment cap). Also, if you qualify for PSLF (government or nonprofit employment), always choose the plan with the lowest payment since PSLF forgives after just 10 years and is always tax-free.
Did you know?
The concept of income-driven student loan repayment was first introduced in the U.S. through the Income-Contingent Repayment (ICR) plan in 1994 under the Clinton administration. However, income-based repayment has been common in other countries for decades. Australia's HECS-HELP system (established 1989) automatically withholds student loan payments through the tax system based on income, with no interest charged (only inflation adjustment). The UK, New Zealand, and several European countries use similar models, making the U.S. system of four competing IDR plans uniquely complex.