How to Use MAGI Calculator
The MAGI Calculator helps US taxpayers estimate Modified Adjusted Gross Income for planning purposes.
- Pick a Purpose — Different rules add back different items, so choose Roth IRA, Premium Tax Credit, student loan, Medicare IRMAA, or general.
- Enter Your AGI — Type your Adjusted Gross Income from your 1040.
- Add Back Common Items — Fill in tax-exempt interest, student loan interest deduction, IRA deduction, foreign earned income exclusion, and any other applicable items.
- Pick a Currency — Use the currency selector to format amounts with your chosen symbol.
Formula & Theory - MAGI Calculator
The MAGI Calculator is based on the general formula:
MAGI = AGI + Tax-Exempt Interest
+ Student Loan Interest Deduction
+ Traditional IRA Deduction
+ Foreign Earned Income Exclusion
+ Foreign Housing Exclusion
+ Passive Loss Add-Back
+ Employer Adoption Benefits
+ Other purpose-specific add-backs| Symbol | Meaning |
|---|---|
| AGI | Adjusted Gross Income from Form 1040 |
| Tax-Exempt Interest | Interest you did not pay federal tax on |
| Foreign Earned Income Exclusion | Income excluded under section 911 |
Assumptions and Limits
MAGI definitions vary by IRS rule. The MAGI Calculator includes the most common add-backs, but specific rules (for example, Premium Tax Credit MAGI vs. Roth IRA MAGI) may require slightly different items. Always confirm with IRS worksheets.
Use Cases for MAGI Calculator
The MAGI Calculator is useful when you want to know your eligibility quickly:
- Roth IRA limits — See if you fall within Roth contribution phase-out ranges.
- Premium Tax Credit — Estimate marketplace subsidy eligibility.
- Student loan interest — Check whether your deduction phases out.
- Medicare IRMAA — Forecast whether higher-income Medicare premiums apply.
Because the MAGI Calculator runs locally in your browser, you can test different add-back scenarios without sharing tax data.