Your adjusted gross income, or AGI, is one of the most important numbers on your tax return. It affects how much tax you owe, which deductions and credits you qualify for, and it is often needed to verify your identity when you file electronically. Knowing what it is and where to find it makes tax time smoother. This guide from The Finance Reveal explains how to find your AGI, part of our Taxes section. This is general education about the US tax system, not tax advice, and rules can change.

What AGI Actually Is

Adjusted gross income is your total income for the year minus certain specific adjustments the tax rules allow. You start with your gross income, wages, interest, and other earnings, then subtract particular deductions known as adjustments to income, such as certain retirement contributions or other qualifying items. The result is your AGI, a figure that sits partway between your total income and your final taxable income.

AGI matters because it is the basis for so much else on your return. Many deductions and credits phase in or out depending on your AGI, so it directly influences what tax breaks you can claim. It is also the starting point from which your deductions, such as the standard deduction, are subtracted to reach taxable income, a relationship our guide to the standard deduction versus itemizing explores. Because it drives eligibility for benefits and the size of your bill, AGI is a number worth understanding.

Where to Find Your AGI

There are several reliable ways to find your AGI, depending on whether you need this year’s or a prior year’s. The table below summarizes them.

The most direct place to find your AGI is on your tax return itself, where it appears on a specific labeled line; if you are looking for last year’s AGI, pull up the return you filed and find that line. If you use tax software, the program calculates your AGI automatically and displays it as you work through your return. If you do not have a copy of a prior return, you can request a tax transcript from the tax authority, which shows your AGI for a given year. And if you are estimating, you can calculate it yourself by taking your total income and subtracting the allowable adjustments. Which method you use depends simply on what you have on hand.

Why You Often Need Last Year’s AGI

A common reason people search for their AGI is that they are asked for the prior year’s figure when filing electronically. Tax authorities often use your previous year’s AGI as an identity-verification tool when you e-file, confirming it is really you by matching the number to their records. So when a tax program asks for last year’s AGI, it is a security check, and entering it correctly lets your return go through.

To supply it, look on last year’s filed return for the AGI line, or use a transcript if you cannot find the return. If your e-filed return is rejected because the AGI does not match, double-check that you are using the correct prior-year figure exactly as it appeared, since even a small discrepancy can cause a rejection, one of the snags our guide to common tax filing mistakes covers. Keeping copies of your returns each year, as part of good record-keeping, makes finding your AGI effortless whenever you need it. Understanding what AGI is and where to locate it removes a common point of confusion at tax time. For related basics, see our guide to tax basics, and explore the full Taxes section.

Frequently Asked Questions

How do I find my AGI?

The most direct way is to look on your tax return, where your AGI appears on a specific labeled line. If you use tax software, it calculates and displays your AGI automatically. For a prior year when you lack the return, you can request a tax transcript from the tax authority. You can also estimate it yourself by subtracting allowable adjustments from your total income.

What is adjusted gross income?

Adjusted gross income is your total income for the year minus certain allowable adjustments, such as particular retirement contributions or other qualifying items. It sits between your gross income and your taxable income. AGI matters because many deductions and credits depend on it, and it is the figure from which deductions are subtracted to reach your taxable income, so it influences both eligibility for tax breaks and your final bill.

Where is my AGI on last year’s return?

Your AGI appears on a specific, labeled line of your filed tax return, so pulling up last year’s return and locating that line gives you the figure. If you cannot find your copy, you can request a tax transcript from the tax authority, which shows your prior-year AGI. Keeping copies of your returns each year makes finding this number quick whenever it is requested.

Why does e-filing ask for my prior year AGI?

Tax authorities often use your previous year’s AGI to verify your identity when you e-file, matching the number against their records to confirm it is really you. So when tax software requests last year’s AGI, it is a security check. Enter it exactly as it appeared on last year’s return; if your return is rejected, confirm you are using the correct prior-year figure, since a mismatch causes rejection.

The Bottom Line

Adjusted gross income is your total income minus certain allowable adjustments, and it is one of the most important figures on your tax return because so much depends on it: many deductions and credits phase in or out based on your AGI, and it is the starting point from which deductions are subtracted to reach your taxable income. Finding it is straightforward. The most direct source is your tax return, where AGI appears on a specific labeled line, so last year’s return gives you last year’s figure. Tax software calculates and displays it automatically, a tax transcript from the tax authority provides it if you lack the return, and you can estimate it yourself as total income minus adjustments. A very common reason people look for their AGI is that e-filing often asks for the prior year’s figure as an identity check, so entering it exactly as it appeared lets your return go through, and a mismatch will cause a rejection to fix. Keeping copies of your returns each year, as part of good record-keeping, makes locating your AGI effortless. Understand what it is and where to find it, and one of tax season’s recurring points of confusion disappears. For related guides, see our articles on the standard deduction versus itemizing, common tax filing mistakes, and tax basics, and explore the full Taxes section. This article is general information about the US tax system, not personalized tax advice, and rules can change, so consult current official instructions or a tax professional.