What Is AGI?
Ever notice how every tax question seems to hinge on "your AGI"? Whether you qualify for a Roth IRA, the child tax credit, or a medical deduction — it all comes back to this one number. Here's what it is and why it drives so much of your return.
AGI
Line 11
On your Form 1040
Definition
Income − adjustments
Before deductions
Drives
Eligibility
Credits & phase-outs
Lower AGI
More breaks
Contributions help
What AGI Actually Is
Adjusted gross income (AGI) is your total income — wages, interest, dividends, side-gig profit, everything — minus a handful of specific "adjustments." It's the number on line 11 of your Form 1040, and it's the starting point for most of the tax system's eligibility tests.
Understand your income
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How AGI Is Calculated
Start with all your income, then subtract the adjustments you're entitled to:
- Traditional IRA contributions.
- Student loan interest (up to $2,500).
- HSA contributions (through payroll or directly).
- Self-employment tax deduction (half of it).
- Educator expenses, certain moving expenses, and a few others.
The result — your AGI — is lower than your gross income. That's the whole point: these "above-the-line" deductions lower AGI, which in turn unlocks more benefits.
Why AGI Matters So Much
Because AGI is the gatekeeper for nearly everything. Your AGI determines whether you can contribute to a Roth IRA, how much of your Social Security is taxable, whether you qualify for the EITC or child tax credit, and how much of your medical expenses you can deduct. In many cases, a dollar of AGI reduction (say, from a 401(k) contribution) does double duty: it lowers your tax and unlocks a credit you'd otherwise phase out of.
AGI vs Taxable Income
These are different numbers, and confusing them trips people up. AGI is before the standard deduction. Taxable income is AGI minus the standard deduction (or itemized deductions). Roughly:
- AGI — decides what you're eligible for.
- Taxable income — decides how much tax you owe (it's what the brackets apply to).
Frequently Asked Questions
How can I lower my AGI?
Contribute to a traditional 401(k) or IRA, fund an HSA, and take any above-the-line deductions you qualify for. Every dollar of AGI reduction can both lower your tax and unlock credits.
Where do I find my AGI?
Line 11 of your Form 1040. It's also on your tax transcript, which is where the IRS gets it when it asks for "prior-year AGI" to verify your identity when e-filing.
Is AGI the same as MAGI?
Not quite. MAGI (modified adjusted gross income) starts with AGI and adds back certain items — like foreign income or tax-exempt interest — for specific programs like Roth IRA eligibility. Different rules use different "MAGI" definitions.
Why does my Roth IRA eligibility depend on AGI?
Because the Roth contribution phase-out is based on MAGI (which starts from AGI). Too high an AGI and your Roth contribution shrinks or disappears — which is why lowering AGI with retirement contributions can keep you eligible.
Sources
- IRS — Adjusted Gross Income definition and Form 1040 line 11.
- IRS Revenue Procedure 2025-32 — 2026 standard deduction and brackets.
- IRS — above-the-line adjustments to income.
This is informational, not tax advice. Your AGI depends on your specific income and deductions.