What Is Adjusted Gross Income (AGI)? How It Affects Your Taxes
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
Adjusted gross income (AGI) is your gross income minus IRS-approved adjustments, such as deductible IRA contributions and student loan interest. It comes before the standard or itemized deduction.
Key takeaways
- AGI = gross income − adjustments to income. The adjustments are listed on Schedule 1 of Form 1040.
- AGI comes before deductions. Taxable income = AGI − standard deduction (or itemized deductions).
- Many deductions and credits shrink or disappear as AGI (or a modified version of it) rises.
- Modified AGI (MAGI) starts with AGI and adds certain items back. Its exact definition depends on which tax rule or program is using it.
- Many states use federal AGI as the starting point for state income tax, then apply their own additions and subtractions.
Adjusted gross income (AGI) is your gross income for the year minus a specific set of IRS-approved “adjustments to income,” such as deductible traditional IRA contributions, student loan interest and the deductible half of self-employment tax. It sits between your total income and your taxable income. AGI is calculated before the standard or itemized deduction, so it is not the amount you pay tax on. It is, however, the figure that many deductions, credits and income limits are measured against. A lower AGI can reduce your tax in two ways: less income flows toward taxable income, and you may qualify for more tax breaks.
How Adjusted Gross Income Is Calculated
The formula has two steps.
Step 1: Total your gross income. Gross income includes everything taxable that you received during the year: wages and salary (Box 1 of your W-2), interest, dividends, net business or freelance income, capital gains, rental income, taxable retirement distributions, unemployment compensation and the taxable portion of Social Security benefits. Income the tax code excludes, such as most municipal bond interest or gifts you receive, is not part of it. The gross income definition covers these categories in more detail.
Step 2: Subtract your adjustments to income. These are sometimes called “above-the-line” deductions because they are subtracted before the AGI line on Form 1040. You claim them whether you take the standard deduction or itemize.
AGI = Gross income − Adjustments to income
Tax software runs this calculation automatically. If you do it by hand, the additional income items (business income, unemployment, gains and so on) go in Part I of Schedule 1, and the adjustments go in Part II.
Common adjustments to income
Each of these has its own eligibility rules and dollar limits:
- Educator expenses for eligible K to 12 teachers who buy classroom supplies
- Health savings account (HSA) contributions made outside payroll (Form 8889)
- The deductible portion (half) of self-employment tax
- Contributions to self-employed SEP, SIMPLE and other qualified retirement plans
- The self-employed health insurance deduction
- Penalties on early withdrawal of savings, such as breaking a CD early
- Deductible contributions to a traditional IRA
- Student loan interest (capped at $2,500 a year and phased out at higher incomes)
- Moving expenses for active-duty members of the armed forces moving under military orders (Form 3903)
- Certain business expenses of armed forces reservists, qualified performing artists, fee-basis state or local government officials and employees with impairment-related work expenses (Form 2106)
- Alimony paid under divorce or separation agreements executed before 2019
If none of these applies to you, your AGI equals your gross income.
What lowers AGI without being an “adjustment”
Some items reduce AGI before Schedule 1 is involved. Pre-tax payroll deductions are the main example. These include traditional 401(k) contributions, HSA contributions made through payroll and certain health premiums. They are already left out of the wage figure in Box 1 of your W-2, so they never enter gross income. This is why a W-2 does not show your AGI: Box 1 is one input, already reduced by pre-tax contributions, but AGI also depends on your other income and adjustments.
Roth contributions work differently. They are made with after-tax dollars and do not reduce AGI.
The standard deduction and itemized deductions also do not affect AGI. They come afterward.
Example of Adjusted Gross Income
Hypothetical example; figures chosen to illustrate the mechanics, not any real taxpayer’s situation.
Maria is single. Her income for the year:
- W-2 wages (Box 1): $70,000
- Savings interest: $1,000
- Net freelance profit: $10,000
Gross income: $70,000 + $1,000 + $10,000 = $81,000
Her adjustments:
- Deductible half of self-employment tax: about $706 (assumes a 15.3% self-employment tax applied to 92.35% of the $10,000 profit, which is about $1,413, then halved)
- Student loan interest paid: $2,500 (assumes she is under the phase-out range)
- Traditional IRA contribution: $3,000 (assumes it is fully deductible)
Total adjustments: $706 + $2,500 + $3,000 = $6,206
AGI: $81,000 − $6,206 = $74,794
To reach taxable income, she subtracts the standard deduction or her itemized deductions, whichever is larger. The IRS lists the 2026 standard deduction as $16,100 for single filers ($32,200 for married couples filing jointly). Using that figure, her taxable income would be $74,794 − $16,100 = $58,694. Income tax brackets apply to that last number, not to her AGI.
Why Adjusted Gross Income Matters
It sets floors and limits on deductions
Several itemized deductions are measured against AGI. Unreimbursed medical and dental expenses are the clearest case: you can deduct only the portion that exceeds 7.5% of AGI, and only if you itemize.
Hypothetical: you have $9,000 of unreimbursed medical bills.
| AGI | 7.5% floor | Deductible medical expenses |
|---|---|---|
| $80,000 | $6,000 | $3,000 |
| $60,000 | $4,500 | $4,500 |
The same bills produce a larger deduction at the lower AGI. Charitable contribution deductions are also capped at a percentage of AGI. That cap only matters for very large gifts relative to income.
It drives eligibility for credits and other tax breaks
Many credits and deductions phase out as income rises. Depending on the provision, the test uses AGI or a version of MAGI. Examples include the earned income tax credit, the child tax credit, education credits, the student loan interest deduction and the deductibility of traditional IRA contributions for people covered by a workplace plan. Reducing AGI with an above-the-line deduction can keep you below a phase-out threshold that you would otherwise cross.
It reaches beyond your federal return
- State income tax. Many states start the state return with federal AGI and then make state-specific additions and subtractions. That is why your state “AGI” or starting figure can differ from your federal one.
- Income-based programs. Health insurance subsidies under the Affordable Care Act, Medicare premium surcharges and income-driven student loan repayment all use AGI or MAGI from your tax return.
- Identity verification. When you e-file, the IRS may ask for your prior-year AGI to confirm your identity. Keep last year’s return handy.
AGI vs. Gross Income, Taxable Income and MAGI
These terms are easy to mix up because each one is a step in the same chain:
| Figure | What it is | How you get there |
|---|---|---|
| Gross income | All taxable income received | Wages + interest + dividends + business income + gains + other taxable income |
| AGI | Gross income after adjustments | Gross income − adjustments to income |
| Taxable income | The amount tax brackets apply to | AGI − standard or itemized deductions (and certain other deductions, such as the qualified business income deduction) |
| MAGI | AGI with specific items added back | AGI + add-backs defined by the rule in question |
A few points follow from this order:
- AGI is always less than or equal to gross income, because adjustments can only subtract.
- AGI is not “income after deductions.” It is income after adjustments but before the standard or itemized deduction. Taxable income is the figure after deductions.
- You choose either the standard deduction or itemizing, not both. Adjustments to income are available either way.
- MAGI is greater than or equal to AGI, because it only adds items back. There is no single MAGI. For Roth IRA eligibility, MAGI adds back items such as the student loan interest deduction, the foreign earned income exclusion and excluded U.S. savings bond interest. For ACA marketplace coverage, MAGI adds untaxed foreign income, nontaxable Social Security benefits and tax-exempt interest. For people with simple finances, AGI and MAGI are often the same number. The MAGI explainer walks through the main versions.
Where to Find AGI on Your Tax Return
On recent versions of Form 1040, AGI appears on line 11. Line numbers can shift between tax years, so look for the line labeled “adjusted gross income.” If you used tax software, AGI is usually shown on the return summary. If you need the figure from an earlier year and don’t have the return, you can get it from an IRS tax transcript.
Limitations of Adjusted Gross Income
AGI is a tax-system measure, not a full picture of your finances.
- It is not take-home pay. AGI ignores the income tax, payroll tax and other withholding taken from your paychecks.
- It is not your tax base. Two people with the same AGI can owe very different amounts once deductions, credits and filing status are applied.
- It leaves out non-taxable income. Tax-exempt interest, nontaxable Social Security and other excluded income do not appear in AGI, even though that money is real. This is why many programs use MAGI instead.
- The relevant number depends on the rule. A threshold described as an “income limit” may refer to AGI, one of several MAGIs, or a state-adjusted figure. Using the wrong one can lead you to over- or underestimate your eligibility.
- It is an annual snapshot. A one-time gain, such as selling an investment or a large retirement distribution, can raise AGI for a single year. That spike can affect credits and premiums tied to that year.
The IRS publishes the forms and instructions that define each adjustment and each MAGI variant. Those instructions are the authority when a specific limit applies to you.
FAQs
Is AGI before or after taxes?
Before. AGI is calculated before income tax is figured, and pre-tax payroll contributions are already left out of it. Income tax is computed later, on taxable income, which is AGI minus your deductions.
Is my state AGI different from my federal AGI?
It can be. Many states begin with federal AGI, then require additions (for example, interest from other states' municipal bonds) and allow subtractions (for example, certain retirement income or U.S. Treasury interest). The resulting state figure may differ from your federal AGI. States without an income tax don't use AGI at all for that purpose.
Can AGI be negative?
Yes. If business losses, deductible capital losses or other losses exceed your income, AGI can fall below zero. Such losses may create a net operating loss that you carry forward to future years.
How can I lower my AGI?
Use pre-tax payroll options, such as traditional 401(k) and HSA contributions through your employer, and claim any adjustments you qualify for, such as deductible traditional IRA contributions, HSA contributions made directly, self-employed retirement contributions or student loan interest. Itemizing or taking the standard deduction lowers taxable income but does not change AGI.
The Bottom Line
AGI matters to anyone filing a federal return, especially people near the income limits for credits, deductions and programs like ACA subsidies. Adjustments such as traditional IRA or HSA contributions can lower AGI and may keep you under a phase-out threshold. Before relying on an income limit, check whether it uses AGI, a specific MAGI or a state figure, and use the IRS instructions for the rule in question.
