Student Loan Calculator: Repayment Plans, Forgiveness & Payoff Strategies (2026)

The average student loan borrower owes approximately $38,000. How fast you pay it off — and how much interest you pay — depends heavily on your repayment plan. Here’s a comprehensive breakdown.

Table of Contents

Standard Repayment (10-Year Plan)

Monthly payments and total interest under the standard plan:

Loan Balance Interest Rate Monthly Payment Total Interest Total Paid
$15,000 5.0% $159 $4,090 $19,090
$20,000 5.0% $212 $5,456 $25,456
$25,000 5.5% $271 $7,559 $32,559
$30,000 5.5% $326 $9,071 $39,071
$40,000 5.5% $434 $12,095 $52,095
$50,000 6.0% $555 $16,619 $66,619
$75,000 6.0% $833 $24,929 $99,929
$100,000 6.5% $1,135 $36,217 $136,217
$150,000 7.0% $1,742 $59,004 $209,004
$200,000 7.0% $2,322 $78,672 $278,672

Impact of Extra Payments

How extra monthly payments accelerate payoff on a $30,000 loan at 5.5%:

Extra Payment Monthly Total Payoff Time Total Interest Interest Saved
$0 (standard) $326 10 years $9,071
+$50 $376 8 years, 2 months $7,230 $1,841
+$100 $426 7 years $5,844 $3,227
+$200 $526 5 years, 5 months $4,220 $4,851
+$300 $626 4 years, 7 months $3,314 $5,757
+$500 $826 3 years, 4 months $2,268 $6,803

An extra $100/month saves over $3,200 in interest and shaves 3 years off repayment.

Income-Driven Repayment Plans

Plan Comparison

Feature SAVE PAYE IBR ICR
Payment % 5% (undergrad) / 10% (grad) 10% 10-15% 20%
Income exemption 225% FPL 150% FPL 150% FPL 100% FPL
Forgiveness timeline 20 years (undergrad) / 25 years (grad) 20 years 20-25 years 25 years
Forgiveness taxable? No (through 2025) May be taxable May be taxable May be taxable
Interest subsidy Yes (unpaid interest doesn’t capitalize) Partial Partial No
Married filing separately Uses only borrower income Uses only borrower income Uses only borrower income Combined income

Monthly Payments Under SAVE Plan

5% of discretionary income for undergraduate loans (discretionary income = AGI - 225% of FPL):

Gross Salary AGI (est.) Discretionary Income Monthly Payment (SAVE)
$30,000 $27,000 $3,775 $16
$35,000 $32,000 $8,775 $37
$40,000 $37,000 $13,775 $57
$45,000 $42,000 $18,775 $78
$50,000 $47,000 $23,775 $99
$60,000 $55,000 $31,775 $132
$75,000 $70,000 $46,775 $195
$100,000 $95,000 $71,775 $299

*Based on single filer with 225% FPL exemption of ~$23,225 for a single-person household in 2026.

SAVE vs Standard: Total Cost Comparison ($40,000 Loan at 6%)

Plan Monthly Payment (Year 1) Payoff Time Total Paid Forgiven?
Standard (10-year) $444 10 years $53,290 No
SAVE ($50K salary) $99 20 years ~$29,000 ~$30,000 forgiven
SAVE ($75K salary) $195 20 years ~$52,000 ~$8,000 forgiven
SAVE ($100K salary) $299 ~15 years ~$53,000 No (paid off before 20 years)

For borrowers earning under $60K, the SAVE plan often results in lower total cost due to forgiveness.

Loan Forgiveness Programs

Public Service Loan Forgiveness (PSLF)

Requirement Detail
Qualifying employer Government agency, non-profit (501(c)(3))
Qualifying payments 120 (10 years) on an IDR plan
Amount forgiven Remaining balance (tax-free)
Qualifying loan type Direct Loans only (consolidate FFEL if needed)

PSLF Savings Example ($80,000 in Loans)

Salary IDR Monthly Payment Payments Over 10 Years Balance Forgiven
$45,000 $78 $9,360 ~$85,000+
$55,000 $120 $14,400 ~$78,000+
$65,000 $166 $19,920 ~$72,000+
$80,000 $228 $27,360 ~$60,000+

PSLF is the most valuable forgiveness program — potentially worth $60,000-100,000+.

Teacher Loan Forgiveness

Qualification Forgiveness Amount
5 years teaching at qualifying low-income school Up to $17,500
Math/science/special education teachers $17,500
Other qualifying teachers $5,000

Repayment Strategies

Debt Avalanche (Highest Interest First)

Loan Balance Rate Minimum Priority
Private loan $15,000 8.5% $180 Pay first
Grad PLUS $25,000 7.0% $290 Second
Undergrad (unsub) $15,000 5.5% $163 Third
Undergrad (sub) $10,000 4.5% $104 Last

Debt Snowball (Smallest Balance First)

Loan Balance Rate Minimum Priority
Undergrad (sub) $10,000 4.5% $104 Pay first
Undergrad (unsub) $15,000 5.5% $163 Second
Private loan $15,000 8.5% $180 Third
Grad PLUS $25,000 7.0% $290 Last

The avalanche method saves the most money; the snowball method provides faster psychological wins.

Refinancing Student Loans

Factor Federal Loans Refinanced (Private)
Typical rate (good credit) 5.0-7.0% (fixed) 4.0-6.0% (variable/fixed)
IDR plans available Yes No
PSLF eligible Yes No
Forbearance/deferment Yes Limited
Interest deduction Up to $2,500/year Up to $2,500/year

When to Refinance

Situation Refinance?
Private loans at high interest Yes — no federal benefits to lose
Federal loans + PSLF-eligible job No — you’d lose PSLF and IDR
Federal loans + high salary + no forgiveness plans Maybe — if you can get a significantly lower rate
Federal loans + uncertain employment No — keep federal protections

Student Loan Interest Deduction

Filing Status Max Deduction Income Phase-Out Start Income Phase-Out End
Single $2,500 $80,000 MAGI $95,000
Married (Joint) $2,500 $165,000 MAGI $195,000

Tax Savings by Bracket

Tax Bracket Max Deduction ($2,500) Annual Tax Savings
12% $2,500 $300
22% $2,500 $550
24% $2,500 $600
32% $2,500 $800

Student Loans vs Other Financial Goals

Should you pay off loans faster or invest?

Your Loan Rate Expected Investment Return Strategy
3-4% 8-10% (S&P 500 average) Invest more, minimum on loans
5-6% 8-10% Split 50/50
7%+ 8-10% Prioritize loan payoff
Any rate + employer 401(k) match Always get the full match first

Key Takeaways

  1. Standard 10-year plan on $30,000 at 5.5% = $326/month and $9,071 total interest
  2. Extra $100/month saves 3 years and $3,200+ in interest
  3. SAVE plan can reduce payments to 5% of discretionary income — as low as $16/month on a $30K salary
  4. PSLF forgives remaining balance after 10 years of qualifying payments at a government or non-profit job (tax-free)
  5. Debt avalanche (highest interest first) saves the most money mathematically
  6. Don’t refinance federal loans if you’re pursuing PSLF or might need income-driven repayment
  7. Always capture employer 401(k) match before making extra loan payments — it’s a guaranteed 50-100% return