A Student Loan Repayment Calculator using Adjusted Gross Income (AGI) helps borrowers estimate their monthly federal student loan payment under income-driven repayment (IDR) plans.
Instead of calculating payments based only on loan balance and interest rate, this calculator uses your income, family size, and federal poverty guidelines to estimate what you may pay each month.
This type of calculator is useful if you are enrolled in or considering income-driven repayment plans such as:
- SAVE Plan
- PAYE (Pay As You Earn)
- IBR (Income-Based Repayment)
- Standard Repayment Plan
These plans are commonly used for federal student loans in the United States.
What Is Adjusted Gross Income (AGI)?
Adjusted Gross Income (AGI) is your total annual income after certain tax deductions.
It is calculated on your federal tax return and used by many government programs to determine eligibility and payment amounts.
AGI is important because federal student loan payments under IDR plans are based on your AGI, not your total salary.
Example deductions that reduce AGI include:
- Retirement contributions
- Health Savings Account (HSA) contributions
- Student loan interest deduction
- Educator expenses
- Self-employment deductions
Your AGI can be found on your IRS Form 1040.
How the Student Loan Calculator Works
This calculator estimates your monthly payment using these steps:
1. Enter Loan Balance
The total amount of federal student loan debt you currently owe.
2. Enter Interest Rate
Your loan’s annual interest rate.
3. Enter Adjusted Gross Income (AGI)
Your yearly income reported on your federal tax return.
4. Enter Family Size
Your household size affects the poverty guideline used to calculate discretionary income.
5. Select Repayment Plan
Different plans calculate payments differently.
For example:
SAVE Plan
Monthly payment ≈ 5% of discretionary income
PAYE Plan
Monthly payment ≈ 10% of discretionary income
IBR Plan
Monthly payment ≈ 15% of discretionary income
What Is Discretionary Income?
Discretionary income is the amount of income remaining after subtracting a percentage of the federal poverty guideline.
For most IDR plans:
Discretionary Income =
AGI − (Poverty Guideline × Multiplier)
Multipliers commonly used:
| Plan | Multiplier |
|---|---|
| SAVE | 225% |
| PAYE | 150% |
| IBR | 150% |
The remaining income is used to calculate your monthly student loan payment.
Example Calculation
Example borrower:
Loan Balance: $50,000
Interest Rate: 5%
AGI: $60,000
Family Size: 3
If enrolled in the SAVE plan:
- Poverty guideline for family of 3 ≈ $25,820
- 225% threshold ≈ $58,095
- Discretionary income ≈ $1,905
- Payment = 5% of discretionary income ÷ 12
Estimated monthly payment ≈ $7.94
Key Terms Used in the Calculator
Adjusted Gross Income (AGI)
Income after tax deductions used to calculate IDR payments.
Discretionary Income
Income remaining after subtracting poverty guideline thresholds.
Federal Poverty Guideline
Income threshold set annually by the U.S. government.
Income-Driven Repayment (IDR)
Federal student loan repayment plans based on income.
Loan Balance
Total remaining amount owed on student loans.
Interest Rate
Annual percentage charged on the loan balance.
Monthly Payment
Estimated amount paid each month under the selected plan.
Loan Forgiveness
Remaining balance canceled after a certain number of payments.
Who Should Use This Calculator?
This calculator is helpful for:
- borrowers with federal student loans
- people considering income-driven repayment plans
- borrowers applying for loan forgiveness programs
- individuals planning lower monthly payments
AGI Student Loan Calculator
An AGI student loan calculator estimates your monthly payment based on your Adjusted Gross Income, family size, and repayment plan.
AGI is used instead of total salary because it reflects income after certain tax deductions.
Example
| Item | Value |
|---|---|
| Loan Balance | $50,000 |
| Interest Rate | 5% |
| AGI | $60,000 |
| Family Size | 3 |
| Plan | SAVE |
Steps
- Poverty guideline (family of 3) ≈ $25,820
- SAVE plan uses 225% of poverty guideline
- Threshold = $25,820 × 2.25 = $58,095
- Discretionary income = $60,000 − $58,095 = $1,905
- SAVE payment = 5% of discretionary income
Monthly payment:
1,905 × 5% ÷ 12 = $7.94
Estimated payment ≈ $8/month
Discretionary Income Student Loan Calculator
A discretionary income calculator determines how much of your income is used to calculate student loan payments.
Formula
| Step | Formula |
|---|---|
| Poverty Threshold | Poverty guideline × multiplier |
| Discretionary Income | AGI − poverty threshold |
| Monthly Payment | Percentage × discretionary income ÷ 12 |
Multipliers by Plan
| Plan | Poverty Multiplier |
|---|---|
| SAVE | 225% |
| PAYE | 150% |
| IBR | 150% |
Example
| AGI | $70,000 |
| Family Size | 2 |
| Poverty Guideline | $19,720 |
SAVE threshold:
19,720 × 2.25 = 44,370
Discretionary income:
70,000 − 44,370 = 25,630
Payment:
25,630 × 5% ÷ 12 ≈ $106.79
SAVE Plan Payment Calculator
The SAVE plan (Saving on a Valuable Education) is one of the newest federal repayment programs.
Key Features
| Feature | Description |
|---|---|
| Payment Rate | 5% of discretionary income (undergraduate loans) |
| Poverty Exemption | 225% of poverty guideline |
| Forgiveness | After 20–25 years |
| Interest Subsidy | Unpaid interest may be covered |
Example
| AGI | $50,000 |
| Family Size | 1 |
| Poverty Guideline | $15,060 |
Threshold:
15,060 × 2.25 = 33,885
Discretionary income:
50,000 − 33,885 = 16,115
Monthly payment:
16,115 × 5% ÷ 12 ≈ $67
IDR Repayment Calculator
Income-Driven Repayment (IDR) plans calculate payments based on income instead of loan balance.
Major IDR Plans
| Plan | Payment % | Poverty Multiplier |
|---|---|---|
| SAVE | 5% | 225% |
| PAYE | 10% | 150% |
| IBR | 10–15% | 150% |
| ICR | 20% | 100% |
Example Comparison
| Plan | Monthly Payment |
|---|---|
| SAVE | $67 |
| PAYE | $134 |
| IBR | $201 |
SAVE typically results in lower payments.
Federal Student Loan Payment Estimator
A federal loan payment estimator predicts payments based on:
- loan balance
- interest rate
- income
- family size
- repayment plan
Example
| Loan | Balance | Rate |
|---|---|---|
| Direct Loan | $30,000 | 4.5% |
| Grad Loan | $20,000 | 6.5% |
Total balance = $50,000
Standard repayment (10 years):
Monthly payment ≈ $530
Under SAVE plan:
Payment may drop to $70–$100 depending on AGI.
How AGI Affects Student Loan Payments
AGI directly determines discretionary income, which determines monthly payments.
Example Comparison
| AGI | Monthly SAVE Payment |
|---|---|
| $30,000 | $0 |
| $50,000 | $67 |
| $70,000 | $107 |
| $100,000 | $233 |
Higher AGI → Higher payment.
Poverty Guideline Student Loan Payment
Federal poverty guidelines determine the income amount protected from student loan payments.
Example Poverty Guidelines
| Family Size | Guideline |
|---|---|
| 1 | $15,060 |
| 2 | $19,720 |
| 3 | $25,820 |
| 4 | $31,200 |
SAVE protects 225% of these values before payments begin.
How to Lower Student Loan Payment With AGI
Borrowers often try to lower payments by reducing AGI.
Ways to Reduce AGI
| Method | Example |
|---|---|
| Retirement contributions | 401(k) or IRA |
| HSA contributions | Health savings account |
| Filing taxes separately | Married couples |
| Business deductions | Self-employed borrowers |
Example
| Before | After |
|---|---|
| AGI | $70,000 |
| AGI after deductions | $60,000 |
Monthly payment under SAVE drops from $107 → $67.
SAVE Plan Payment Too High
Reasons payments may appear high:
| Cause | Explanation |
|---|---|
| High AGI | Payment increases |
| Small family size | Less poverty protection |
| Married income counted | Household income included |
| Updated income certification | Payment recalculated |
Example
| AGI | Family | Payment |
|---|---|---|
| $60,000 | 1 | $110 |
| $60,000 | 4 | $20 |
Family size matters significantly.
Family Size Effect on IDR Payment
Family size increases the poverty guideline threshold.
Example
| Family Size | Poverty Threshold (SAVE) | Payment |
|---|---|---|
| 1 | $33,885 | $67 |
| 2 | $44,370 | $44 |
| 4 | $70,200 | $0 |
Larger families → lower payments.
Should I File Taxes Jointly or Separately for Student Loans?
Married borrowers may reduce payments by filing separately.
Comparison
| Filing Type | Income Counted |
|---|---|
| Joint | Both spouses |
| Separate | Borrower income only |
Example
| Borrower AGI | $50,000 |
| Spouse AGI | $60,000 |
Joint filing income = $110,000
Separate filing income = $50,000
Payments could drop dramatically.
How Discretionary Income Is Calculated
Formula:
Discretionary Income =
AGI − (Poverty Guideline × Multiplier)
Example
| AGI | $65,000 |
| Family | 2 |
| Poverty | $19,720 |
Threshold:
19,720 × 2.25 = 44,370
Discretionary income:
65,000 − 44,370 = 20,630
Monthly SAVE payment:
20,630 × 5% ÷ 12 ≈ $86
What Is Discretionary Income for Student Loans?
Discretionary income is the portion of your income used to calculate student loan payments under IDR plans.
It is calculated after subtracting a percentage of the federal poverty guideline from your AGI.
How Does AGI Affect Income-Driven Repayment?
AGI determines how much income remains after poverty protection.
Higher AGI → higher discretionary income → higher payments.
Example
| AGI | Monthly SAVE Payment |
|---|---|
| $40,000 | $25 |
| $60,000 | $67 |
| $80,000 | $150 |
How Can I Reduce My Student Loan Payment?
Strategies include:
| Strategy | Description |
|---|---|
| Switch to SAVE plan | Often lowest payments |
| Increase retirement deductions | Lower AGI |
| Increase family size reporting | Adjust threshold |
| File taxes separately | Exclude spouse income |
| Re-certify income | Update payments |
Does Family Size Change SAVE Plan Payments?
Yes. Family size significantly affects payments.
Example
| AGI | $60,000 |
| Plan | SAVE |
| Family Size | Monthly Payment |
|---|---|
| 1 | $110 |
| 2 | $85 |
| 3 | $67 |
| 4 | $20 |
Larger households receive higher poverty protection.
Is SAVE Better Than PAYE or IBR?
In many cases, yes.
Comparison
| Plan | Payment % | Poverty Protection |
|---|---|---|
| SAVE | 5% | 225% |
| PAYE | 10% | 150% |
| IBR | 10–15% | 150% |
SAVE usually results in:
- lower payments
- interest protection
- higher income exemption
However, PAYE may be better for certain forgiveness timelines.
Summary
An AGI-based student loan calculator helps estimate payments under income-driven repayment plans by considering:
- adjusted gross income
- family size
- poverty guidelines
- repayment plan rules
These factors determine discretionary income, which is used to calculate your monthly payment.
Disclaimer
This calculator provides estimates only. Actual payments may vary depending on:
- updated federal poverty guidelines
- loan servicer calculations
- changes in income
- family size updates
- government policy updates