Adjusted Gross Income: What AGI Is and How to Calculate It

Your adjusted gross income (AGI) is your total (gross) income from all sources minus certain adjustments listed on Schedule 1 of Form 1040. On the 2025 Form 1040 it appears on line 11a. AGI is not your taxable income: your standard or itemized deduction comes off after AGI, further down the form. AGI is the number the tax code uses most, because dozens of deductions, credits and phase-outs are measured against it rather than against your gross pay.

What is adjusted gross income?

Adjusted gross income is your gross income (wages, self-employment profit, interest, dividends, retirement distributions, unemployment, and everything else the code counts) reduced by a specific list of adjustments in Part II of Schedule 1. Those adjustments are often called "above-the-line" deductions because they sit above the AGI line on the return.

What makes AGI different from every other subtotal on the 1040 is that you get the above-the-line adjustments whether you itemize or take the standard deduction. A teacher claiming educator expenses and a freelancer deducting half of their self-employment tax both reduce AGI while still taking the standard deduction. That is why an HSA contribution or a deductible IRA contribution is worth more than its face value: it lowers your tax and simultaneously moves you down the phase-out ranges for other benefits.

How do you calculate adjusted gross income?

Add up every source of taxable income to get total income on line 9 of Form 1040. Then total your Schedule 1 Part II adjustments and carry that figure to line 10. Subtract line 10 from line 9. The result is your adjusted gross income on line 11a. That is the whole calculation.

The adjustments available for 2025 on Schedule 1, Part II are a closed list. You cannot invent new ones:

• Educator expenses
• Certain business expenses of reservists, performing artists and fee-basis government officials
• Health savings account deduction
• Moving expenses for members of the Armed Forces
• Deductible part of self-employment tax
• Self-employed SEP, SIMPLE and qualified plans
• Self-employed health insurance deduction
• Penalty on early withdrawal of savings
• Alimony paid
• IRA deduction
• Student loan interest deduction
• Archer MSA deduction
• Other adjustments, including jury duty pay handed over to an employer and attorney fees for unlawful discrimination claims

Self-employed filers have the most to work with here: the deductible half of SE tax, retirement plan contributions, and health insurance premiums all land above the line. If you are running a Schedule C, our self-employed tax filing guide walks through which of those you actually qualify for.

Where is adjusted gross income on the 1040?

On the 2025 Form 1040, adjusted gross income is on line 11a. Line 11b carries the same figure to page 2. This is a change: for tax years 2020 through 2024, AGI sat on a plain line 11 with no letter suffix, and plenty of published guidance (including some pages on IRS.gov) still says "line 11" without qualification.

The renumbering happened because the 2025 form split the deduction block to make room for new items. Here is the full chain as it now reads:

Pay attention to line 13b. Schedule 1-A is new for 2025 and carries the deductions created by the One Big Beautiful Bill Act. Because it feeds line 13b, which sits below AGI, those deductions reduce your taxable income but they do not reduce your AGI. A lot of commentary has this backwards. Claim a Schedule 1-A deduction and assume your AGI dropped enough to qualify for a Roth contribution or a bigger credit, and you will be unpleasantly surprised. Only Schedule 1 Part II moves AGI.

Adjusted gross income vs taxable income: what is the difference?

AGI is income after above-the-line adjustments only. Taxable income is AGI after your standard or itemized deduction, the qualified business income deduction, and any Schedule 1-A deductions. Taxable income is always the smaller number, and it is the one your tax rates are applied to. AGI never has a rate applied to it directly.

The distinction matters because the two numbers do different jobs. Tax brackets, capital gains rate thresholds and the actual tax computation all run off taxable income. Eligibility for benefits runs off AGI or a modified version of it. Someone with $120,000 of AGI and a $32,000 itemized deduction has roughly $88,000 of taxable income, but every phase-out test in this article still looks at the $120,000.

Also worth separating: adjusted gross income vs gross income. Gross income is the raw total on line 9 before anything comes off. AGI is that total after Schedule 1 adjustments. If you have no adjustments at all, your gross income and your AGI are identical, which is the case for a lot of straightforward W-2 filers.

Is adjusted gross income on your W-2?

No. A W-2 does not show AGI anywhere. Box 1 reports wages from one employer. AGI is a return-level figure that aggregates income from every source and every payer, then subtracts Schedule 1 Part II adjustments. It is calculated on Form 1040 and never printed on a W-2.

People assume Box 1 is AGI because for a single-job filer with no other income and no adjustments, the two numbers can land close together. They are still not the same thing. Box 1 has already been reduced by pre-tax payroll items such as 401(k) contributions and health insurance premiums, which is why Box 1 is usually lower than your gross salary. Add a second job, a 1099, savings interest, or a student loan interest deduction, and Box 1 stops resembling AGI entirely. Every payer's form has to be totaled first; only then do the adjustments come off.

Why does adjusted gross income matter?

AGI, or a modified version of it, is the gatekeeper for most of the tax code's benefits. Contribution limits, deduction eligibility and credit amounts are nearly all measured against it. Cross a threshold by a few hundred dollars and a credit shrinks or vanishes, which is why a late deductible IRA contribution can be worth far more than the deduction itself.

The Earned Income Tax Credit adds its own wrinkle: you have to be under the limit on both earned income and AGI. Passing one test is not enough.

AGI also travels outside the tax system. Mortgage underwriters and lenders read it straight off your filed return as their income figure, so the same number that sets your Roth eligibility sits next to whatever is actually dragging your score down in a loan file. Income-driven student loan repayment plans and ACA premium subsidies use it too. To see how adjustments change your bottom line, run the numbers through our tax refund calculator.

What is modified adjusted gross income (MAGI)?

Modified adjusted gross income is AGI plus specified add-backs, computed on a worksheet. MAGI never appears as a line on Form 1040, and there is no single definition of it. The add-backs differ depending on which benefit you are testing, so your MAGI for an IRA deduction and your MAGI for an ACA subsidy can be two different numbers on the same return.

Traditional IRA MAGI starts at AGI and adds back the IRA deduction itself, the student loan interest deduction, excludable savings bond interest, employer-provided adoption benefits, and the foreign earned income and housing exclusions.

Premium Tax Credit MAGI is the most divergent version. It adds back foreign earned income, tax-exempt interest (line 2a), and nontaxable Social Security (line 6a minus line 6b). That last pair catches people out constantly. A retiree holding municipal bonds owes no federal tax on that interest, but it counts in full for ACA subsidy math, and so does the untaxed portion of their Social Security. Two households with identical AGI can qualify for very different subsidies for exactly this reason.

How do I find my prior year AGI?

The IRS uses your prior year AGI to sign and validate an e-filed return. It works as a shared secret: a fraudster filing in your name generally cannot supply last year's AGI. You can find it in your IRS Online Account under Records and Status, by requesting a free tax return transcript, or by reading it off your own copy of last year's Form 1040.

Three situations that cause rejected returns:

• First-time filers over 16. Enter zero. There is no prior return to match against.
• Last year's return had not been processed yet when you file this year. Enter $0 so the return is accepted. Using the real figure from an unprocessed return is one of the most common e-file rejection causes.
• You have an Identity Protection PIN. The IP PIN verifies your identity instead of the prior year AGI, so use it.

One more trap: use the AGI from the return as originally filed, not from an amended version. Married couples who filed jointly last year both use the same joint AGI.

Getting the number right

AGI is not something you estimate. It falls out of a correctly prepared return, and everything downstream depends on it being right: your credits, your IRA eligibility, your state return, and next year's e-file signature. TaxFile reads your W-2s and 1099s (or just chats with you about your situation), prepares your federal and state return, finds the deductions and credits you qualify for, runs an error check, and e-files through an authorized IRS e-file provider only after you review and approve every line. Pricing is $39 simple, $89 self-employed, $199 business, plus $19 per state, with no free plan. If you want to see the flow first, start with online tax filing, and check this year's filing deadlines before you begin. This is self-prepared software and general information, not tax advice; for complex situations, consult a CPA or tax professional.