What Is Adjusted Gross Income (AGI)? Why It Matters

Q: Does AGI include my spouse's income?

If you're filing jointly(/filing-status-explained), yes — your AGI includes both spouses' income minus both spouses' adjustments. If filing separately, each spouse calculates their own AGI.

Adjusted Gross Income — better known as AGI — is one of the most important numbers on your tax return. It’s the figure the IRS uses to determine whether you qualify for dozens of credits, deductions, and tax benefits. If you’ve ever been told you “earn too much” for a particular tax break, it’s usually your AGI (or a close cousin called MAGI) that the IRS is looking at.

Data Notice: Tax figures and thresholds related to what is agi cited in this article are projected 2026 values based on IRS guidance and current legislation. Tax law is subject to change. Verify all figures with IRS.gov or a licensed tax professional before making decisions.

Understanding AGI doesn’t require an accounting degree. It’s a straightforward calculation, and once you see how it works, your entire tax return will make more sense.

The Simple Formula

Here’s AGI in plain English:

Gross Income − Above-the-Line Adjustments = Adjusted Gross Income (AGI)

That’s it. You start with everything you earned, subtract specific deductions that the IRS allows “above the line,” and the result is your AGI. It appears on Line 11 of Form 1040.

Let’s break down both sides of that equation.

What Counts as Gross Income?

Gross income is the broadest measure of your income. It includes virtually everything you received during the year:

Wages and salaries — The amount in Box 1 of your W-2
Self-employment income — Net profit from Schedule C
Interest income — From savings accounts, CDs, bonds (reported on 1099-INT)
Dividend income — From stocks and mutual funds (reported on 1099-DIV)
Capital gains — Profits from selling stocks, real estate, or other assets
Rental income — Net income from rental properties
Retirement distributions — Taxable portions of IRA, 401(k), and pension withdrawals
Unemployment compensation — Fully taxable at the federal level
Alimony received — For divorce agreements finalized before 2019
Business income — From partnerships, S corporations (via Schedule K-1)
Gambling winnings — Yes, all of them
Forgiven debt — In some cases, canceled debt counts as income

Some income is excluded from gross income, such as:

Gifts and inheritances
Life insurance proceeds
Municipal bond interest
Qualified Roth IRA distributions
Workers’ compensation benefits
Most employer-provided health insurance

What Are “Above-the-Line” Adjustments?

These are specific deductions you can take to reduce your gross income before calculating your AGI. They’re called “above the line” because they appear above the AGI line on your tax return. The key advantage is that you can claim these even if you take the standard deduction — you don’t need to itemize.

Common above-the-line adjustments include:

Retirement Contributions

Traditional IRA contributions — Up to ~$7,000 (or ~$8,000 if you’re 50+), depending on income and whether you have a workplace retirement plan
Self-employed retirement contributions — SEP-IRA, SIMPLE IRA, or solo 401(k) contributions

Self-Employment Adjustments

One-half of self-employment tax — Self-employed individuals pay both the employee and employer shares of Social Security and Medicare tax. You can deduct the employer-equivalent portion. See our self-employment tax guide for details
Self-employed health insurance premiums — If you’re self-employed and pay for your own health insurance

Education Adjustments

Student loan interest — Up to $2,500 per year (subject to income phaseouts)
Educator expenses — Up to ~$300 for qualified teachers who buy classroom supplies

Other Adjustments

HSA contributions — Up to ~$4,300 for individual coverage or ~$8,550 for family coverage
Alimony paid — For divorce agreements finalized before 2019
Moving expenses — Only for active-duty military members
Penalty on early withdrawal of savings — If your bank charged a penalty for breaking a CD early

A Step-by-Step AGI Calculation Example

Let’s walk through a realistic example.

Sarah’s income for 2026:

Salary from her job: ~$72,000 (W-2, Box 1)
Freelance graphic design work: ~$15,000 (1099-NEC, after business expenses on Schedule C)
Savings account interest: ~$800
Stock dividends: ~$1,200

Sarah’s gross income: ~$72,000 + ~$15,000 + ~$800 + ~$1,200 = ~$89,000

Sarah’s above-the-line adjustments:

Traditional IRA contribution: ~$7,000
One-half of self-employment tax on her freelance income: ~$1,060
Student loan interest: ~$2,100
HSA contribution: ~$4,300

Total adjustments: ~$7,000 + ~$1,060 + ~$2,100 + ~$4,300 = ~$14,460

Sarah’s AGI: ~$89,000 − ~$14,460 = ~$74,540

This is the number that appears on Line 11 of her Form 1040. From here, she’ll subtract either the standard deduction or itemized deductions to arrive at her taxable income.

Why AGI Matters So Much

Your AGI isn’t just a line on your tax return — it’s the gatekeeper for numerous tax benefits.

Credit and Deduction Phaseouts

Many tax credits and deductions begin to phase out (reduce) once your AGI exceeds certain thresholds. For example:

Credit/Deduction	Phaseout Begins At (Single)	Phaseout Begins At (MFJ)
Child Tax Credit	~$150,000	~$300,000
Earned Income Tax Credit	~$19,104 (no children)	~$25,511 (no children)
Student Loan Interest Deduction	~$80,000	~$165,000
Traditional IRA Deduction (with workplace plan)	~$79,000	~$126,000
Education Credits (AOTC)	~$80,000	~$150,000

Health Insurance Subsidies

If you buy health insurance through the ACA marketplace, your AGI (specifically, your MAGI — see below) determines how much of a premium tax credit you receive. Higher AGI means lower subsidies.

Medicare Premiums

Higher-income retirees pay more for Medicare Part B and Part D premiums. The Income-Related Monthly Adjustment Amount (IRMAA) kicks in when your MAGI exceeds ~$106,000 (single) or ~$212,000 (married filing jointly).

Student Financial Aid

The FAFSA (Free Application for Federal Student Aid) uses your AGI to calculate your Expected Family Contribution. A lower AGI can mean more financial aid.

State Taxes

Many states use your federal AGI as the starting point for calculating state income tax. Lowering your federal AGI can directly reduce your state tax bill too.

AGI vs. MAGI: What’s the Difference?

You’ll sometimes see references to Modified Adjusted Gross Income (MAGI) instead of AGI. MAGI starts with your AGI and then adds back certain deductions or exclusions.

The tricky part is that there’s no single MAGI formula. Different tax provisions define MAGI differently. Here are the most common add-backs:

For IRA contribution deductibility: AGI + student loan interest deduction + tuition deduction + foreign earned income exclusion
For ACA premium tax credits: AGI + tax-exempt interest + excluded foreign income
For Medicare IRMAA surcharges: AGI + tax-exempt interest

In many cases, MAGI is very close to AGI — sometimes identical. If you don’t have foreign income or tax-exempt interest, your MAGI may be the same as your AGI for most purposes.

How to Find Your AGI

On Your Tax Return

Your AGI is on Line 11 of Form 1040. If you used tax software, it’s prominently displayed in your summary.

From the IRS

If you need your AGI from a prior year (for example, to e-file — the IRS uses last year’s AGI to verify your identity), you can:

Check your IRS Online Account — Log in at irs.gov to view your tax records
Request a tax transcript — You can get a Tax Return Transcript that shows your AGI
Check your tax software — Prior year returns are usually stored in your account

Strategies to Lower Your AGI

Since so many tax benefits depend on AGI, there’s a real incentive to reduce it when possible. Here are legitimate strategies:

Maximize Retirement Contributions

Contribute the maximum to your 401(k) — up to ~$23,500 for 2026 (plus ~$7,500 catch-up if you’re 50+)
Contribute to a traditional IRA — up to ~$7,000 (plus ~$1,000 catch-up if you’re 50+)
Self-employed? A SEP-IRA lets you contribute up to ~25% of net self-employment income

Use a Health Savings Account (HSA)

If you have a high-deductible health plan, contribute the maximum to an HSA. For 2026, that’s ~$4,300 for individual coverage or ~$8,550 for family coverage.

Claim All Business Deductions

If you have self-employment income on Schedule C, make sure you’re deducting all legitimate expenses. Every dollar of business deduction reduces your gross income and therefore your AGI.

Pay Student Loan Interest

If you’re repaying student loans, you can deduct up to ~$2,500 in interest (subject to income phaseouts).

Time Your Income

If you have some control over when you receive income (for example, as a freelancer), you might be able to defer invoicing to the following year to keep the current year’s AGI lower. This is called “income timing” and it’s perfectly legal.

The Full Income Flow: Gross Income → AGI → Taxable Income

Understanding where AGI fits in the big picture helps demystify your tax return:

Gross Income — Everything you earned
Minus above-the-line adjustments — Retirement contributions, student loan interest, HSA, etc.
= AGI (Form 1040, Line 11)
Minus standard deduction or itemized deductions — For 2026, the standard deduction is ~$15,000 (single) or ~$30,000 (married filing jointly)
= Taxable Income — This is the amount your tax brackets actually apply to

For the complete picture of how these pieces fit together, see our article on taxable income vs. gross income.

Frequently Asked Questions

Is AGI the same as my salary?

No. Your salary is just one component of gross income. AGI also includes other income sources (interest, dividends, self-employment) and then subtracts above-the-line adjustments. Your AGI could be higher or lower than your salary.

Does AGI include my spouse’s income?

If you’re filing jointly, yes — your AGI includes both spouses’ income minus both spouses’ adjustments. If filing separately, each spouse calculates their own AGI.

Are 401(k) contributions subtracted from gross income?

Traditional 401(k) contributions through your employer are already excluded from Box 1 of your W-2, so they’ve already reduced your gross income. You don’t subtract them again. However, traditional IRA contributions are an above-the-line adjustment that you do subtract to calculate AGI.

What’s the difference between AGI and taxable income?

AGI is your income after above-the-line adjustments. Taxable income is AGI minus your standard or itemized deductions — it’s the smaller number that your tax brackets actually apply to. See our detailed comparison.

Can my AGI be negative?

Technically, yes. If your adjustments and losses exceed your income, you could have a negative AGI. This most commonly happens when business losses exceed other income.

Why does the IRS ask for my prior-year AGI when I e-file?

The IRS uses your prior-year AGI as an identity verification tool. It’s a number that only you and the IRS should know. If you can’t remember it, use the IRS’s Identity Protection PIN or request a transcript.

Tax information is for educational purposes only and does not constitute tax, legal, or financial advice. Consult a licensed tax professional for guidance specific to your situation.