AGI Calculator

If you’ve ever filed a U.S. tax return, you’ve seen Adjusted Gross Income (AGI) right on the first page. The figure determines which tax breaks you can claim, from education credits to IRA deductions. Use the free AGI calculator above to estimate your adjusted gross income for the 2026 tax year – just enter your income sources and adjustments to see the number.

What Is Adjusted Gross Income (AGI)?

AGI is your total gross income minus a set of specific write-offs the IRS calls “adjustments to income.” These adjustments are also known as above-the-line deductions because they reduce your income before you decide whether to take the standard deduction or itemize.

Gross income includes everything you earn in a tax year that’s not explicitly tax-exempt: wages, salaries, tips, net business income, dividends, capital gains, rental income, retirement distributions, unemployment compensation, and even some Social Security benefits. Once you’ve added all those up, you subtract the adjustments to arrive at your AGI.

The calculator above follows the same logic. It sums the income you report and applies the most common adjustments, so you don’t have to cross-reference IRS schedules by hand.

How to Calculate AGI – Step by Step

The IRS formula for AGI is straightforward:

AGI = Total Gross Income – Adjustments to Income

Here’s how that works in practice:

1. Total up all taxable income sources
   Wages (W-2), business or freelance income (Schedule C), investment income (interest, dividends, capital gains), rental income, retirement payouts, and taxable portions of Social Security. Alimony received under pre-2019 agreements also counts.

2. List every adjustment you qualify for
   The IRS allows more than a dozen above-the-line deductions. For 2026, the most common are:

   • Traditional IRA contributions (up to the annual limit; check current figures for your age)
   • Student loan interest – up to $2,500
   • Educator expenses – up to $300 for eligible K-12 teachers
   • Health savings account (HSA) contributions
   • Self-employment tax deduction (50% of self-employment tax paid)
   • Self-employed health insurance premiums
   • SEP, SIMPLE, or solo 401(k) contributions
   • Alimony paid under pre-2019 divorce agreements
   • Tuition and fees deduction (if extended by Congress)
   • Penalty on early withdrawal of savings

3. Subtract adjustments from gross income
   The result is your AGI. No rounding is needed beyond the usual dollar amounts.

You don’t need receipts to make these calculations, but you should keep documentation. The calculator above automatically applies the deductions you enter, so you can experiment with different scenarios.

Why AGI Matters More Than Your Gross Income

AGI functions as a gatekeeper in the tax code. Many phaseouts and eligibility thresholds are pegged to it:

• Itemized deductions – high-income taxpayers lose part of certain write-offs when AGI exceeds a threshold.
• Education credits – the American Opportunity Credit and Lifetime Learning Credit phase out based on AGI (ranges change annually).
• Roth IRA contribution limits – your MAGI (derived from AGI) determines whether you can contribute directly and how much.
• Premium tax credits for marketplace health insurance – eligibility depends on AGI as a percentage of the federal poverty level.
• State income taxes – many states use federal AGI as a starting point for their own returns.

Because it drives so many calculations, even small changes in your AGI can significantly alter your tax bill. The calculator lets you test different income and adjustment amounts to see how your AGI shifts.

AGI vs. MAGI – What’s the Difference?

Modified Adjusted Gross Income (MAGI) takes your AGI and adds back specific items. Common add-backs include tax-exempt municipal bond interest, the foreign earned income exclusion, and deductions for IRA contributions (when computing MAGI for Roth IRA eligibility). The IRS uses MAGI to determine whether you qualify for certain credits and deductions, but you don’t report MAGI directly on your return – it’s a calculation used behind the scenes.

If you need to estimate MAGI, start with your AGI from the calculator above and then add back exclusions or deductions that apply to your situation.

Where AGI Fits on Your Tax Return

On the 2024-and-later versions of Form 1040, AGI appears on line 11. Most tax software pulls it automatically from the income and adjustment sections you complete. If you’re estimating for a future return or working on a paper form, the calculator gives you the exact number you’d enter there.

This article provides general information only and is not a substitute for professional tax advice. Tax laws change frequently; consult a qualified preparer for your specific situation.