AGI is your total income minus specific deductions the IRS allows

AGI stands for Adjusted Gross Income. It is the number the IRS uses to determine how much tax you owe, whether you can claim certain deductions, and whether you may have access to for tax credits. AGI is not the same as your total income — it is your income after you subtract certain allowed deductions, called "above-the-line" deductions.

Think of it this way: you earn money from wages, investments, or self-employment. That is your gross income. Then you subtract things like contributions to a traditional IRA, student loan interest, or half of your self-employment tax. What remains is your AGI. This number appears on your tax form — line 11 on the 2024 Form 1040 — and it is the starting point for calculating your actual tax bill.

Your AGI matters because many tax benefits phase out at certain income levels. If your AGI is too high, you may lose the ability to claim a child tax credit, claim education credits, or deduct certain losses. The IRS uses AGI as the gatekeeper for these benefits, so knowing your AGI before you file helps you understand what you can and cannot claim.

Key Takeaways

  • AGI is your gross income minus specific deductions like traditional IRA contributions, student loan interest, and self-employment tax, and it appears on line 11 of Form 1040.
  • Many tax credits and deductions phase out once your AGI reaches certain thresholds, so a lower AGI can unlock more tax benefits.
  • Common above-the-line deductions include contributions to a traditional IRA (up to $7,000 in 2024, or $8,000 if you are 50 or older), educator expenses, and student loan interest (up to $2,500).
  • Your AGI is different from your taxable income — after you calculate AGI, you then subtract either the standard deduction or itemized deductions to reach taxable income.

How to find your AGI on your tax return

If you have already filed a tax return, your AGI is printed on line 11 of Form 1040. If you filed in a previous year, you can find your AGI on a copy of that return or by requesting a transcript from the IRS. The IRS Free File program and most tax software will calculate your AGI automatically as you enter your income and deductions.

When you use tax software, the program walks you through income sources (wages, interest, dividends, self-employment income) and then asks about deductions you can claim above the line. The software adds up your income, subtracts those deductions, and shows you the result as your AGI. You do not calculate it yourself — the form does the math.

If you file by hand using Form 1040, you will add up all your income sources on lines 1 through 9, then subtract your above-the-line deductions on lines 10a through 10f. Line 11 is where you write your AGI.

Common deductions that lower your AGI

Not all deductions lower your AGI. Only "above-the-line" deductions do. These are deductions you can claim whether you take the standard deduction or itemize. The most common ones are contributions to a traditional IRA (up to $7,000 in 2024, or $8,000 if you are 50 or older), student loan interest (up to $2,500 per year), and educator expenses (up to $300 if you are a teacher or school staff member who buys classroom supplies).

If you are self-employed, you can deduct half of your self-employment tax, which also lowers your AGI. Health insurance premiums you pay as a self-employed person are deductible above the line. Contributions to a Health Savings Account (HSA) also reduce your AGI.

Other above-the-line deductions include alimony payments (if the divorce or separation agreement was signed before 2019), contributions to a Coverdell Education Savings Account, and certain moving expenses if you are on active military duty. The full list appears in the instructions to Form 1040.

Deductions that do not lower your AGI include mortgage interest, property taxes, charitable donations, and medical expenses. These are "below-the-line" deductions — you can claim them only if you itemize, and they do not affect your AGI.

Why AGI affects your tax credits and deductions

The IRS uses AGI as a threshold to decide who can claim certain credits and deductions. For example, the Earned Income Tax Credit (EITC) phases out once your AGI reaches a certain level — in 2024, the limit depends on your filing status and number of children, but it ranges from about $43,000 to $63,000. If your AGI is above that limit, you cannot claim the credit, even if you earned less in actual wages.

The Child Tax Credit also has an AGI limit. If your AGI exceeds $400,000 (for married couples filing jointly) or $200,000 (for single filers), the credit begins to phase out. Education credits like the American Opportunity Credit and Lifetime Learning Credit have AGI limits too. The higher your AGI, the smaller these credits become, or the sooner you lose them entirely.

Some deductions are also limited by AGI. For example, you can deduct medical expenses only if they exceed 7.5% of your AGI. If your AGI is $60,000, you can deduct medical expenses only above $4,500. A higher AGI means a higher threshold, so fewer of your medical expenses may have access to.

The difference between AGI and taxable income

AGI is not the same as taxable income, and this confusion trips up many people. After you calculate your AGI, you then subtract either the standard deduction or your itemized deductions to reach your taxable income. Taxable income is the number you use to look up your tax bracket and calculate how much tax you owe.

For 2024, the standard deduction is $14,600 for single filers, $29,200 for married couples filing jointly, and $21,900 for heads of household. If you do not itemize, you straightforward subtract this amount from your AGI. If you do itemize (claiming mortgage interest, property taxes, charitable donations, and other below-the-line deductions), you add those up and subtract that total instead.

Here is a straightforward example: suppose your gross income is $70,000, you contribute $6,000 to a traditional IRA, and you take the standard deduction. Your AGI is $64,000. Your taxable income is $64,000 minus $14,600 (the standard deduction), which equals $49,400. You would look up the tax on $49,400 to find your tax bill.

How to lower your AGI before filing

If you want to reduce your AGI before you file, focus on above-the-line deductions. Contributing to a traditional IRA is one of the most direct ways — you can contribute up to $7,000 in 2024 (or $8,000 if you are 50 or older), and the full amount lowers your AGI, as long as you are not covered by a workplace retirement plan or your income is below certain limits.

If you are self-employed, make sure you are deducting all legitimate business expenses, because those reduce your net self-employment income before it is added to your AGI. Health insurance premiums you pay as a self-employed person are fully deductible above the line. If you have a Health Savings Account, contributing to it before the tax important date also lowers your AGI.

Student loan interest up to $2,500 per year is deductible above the line, even if you do not itemize. If you are paying student loans, make sure you claim this deduction — it is one of the easiest ways to lower your AGI without having to itemize.

Keep in mind that some of these deductions have income limits or other restrictions. For example, if you are covered by a workplace retirement plan and your income is above a certain threshold, you may not be able to deduct a traditional IRA contribution. Check the IRS rules or speak with a tax professional before assuming a deduction will work for you.

AGI and tax software or professional preparation

If you use tax software like TurboTax, H&R Block, or TaxAct, the program calculates your AGI for you. You enter your income sources and deductions, and the software adds and subtracts automatically. At the end, it shows you your AGI on a summary page before you file.

If you work with a tax professional — a CPA, enrolled agent, or tax preparer — they will calculate your AGI as part of preparing your return. They will ask you about all income sources and deductions, make sure you are claiming everything you are may have access to to, and show you the AGI on your completed return before you sign it.

The IRS Free File program, available through IRS.gov, offers free tax software to people who earn below a certain income threshold (usually around $79,000). This software calculates AGI just like paid software does.

Frequently Asked Questions

Can I have a high gross income but a low AGI?

Yes. If you have large above-the-line deductions, your AGI can be much lower than your gross income. For example, if you earn $100,000 in wages but contribute $20,000 to a traditional IRA and have $10,000 in self-employment tax deductions, your AGI would be $70,000. This is why AGI matters more than gross income for tax purposes.

Does AGI include capital gains and investment income?

Yes. Capital gains, dividends, interest, and other investment income are all part of your gross income and are included in your AGI calculation. However, long-term capital gains may be taxed at a lower rate than ordinary income, even though they count toward your AGI.

What if I made a mistake on my AGI when I filed?

If you discover an error after filing, you can file an amended return using Form 1040-X. The IRS will recalculate your tax based on the correct AGI. You have generally three years from the original filing date to file an amended return and claim a refund.

Does my AGI affect my state income tax?

Most states use federal AGI as the starting point for calculating state income tax, though some states allow additional deductions or make adjustments. Check your state's tax forms or website to see whether it uses federal AGI or a modified version.