Adjusted gross income is a U.S. federal tax measure equal to total income minus eligible adjustments, before standard or itemized deductions.
Adjusted gross income (AGI) is a U.S. federal individual income-tax measure equal to total income minus eligible adjustments to income. AGI is calculated before the standard deduction or itemized deductions and is used as the starting point for many deduction, credit, contribution, and tax calculations.
At a high level:
For this purpose, total income is the amount assembled under federal individual income-tax rules. It can include taxable wages, interest, dividends, capital gains, retirement distributions, business income, rental income, unemployment compensation, and other items, depending on the taxpayer’s facts and the applicable law.
Adjustments to income are sometimes informally called above-the-line deductions because they are used before AGI. The current categories and eligibility rules are listed in the Form 1040 instructions and, where applicable, Schedule 1. Examples can include eligible educator expenses, health savings account deductions, deductible self-employed retirement or health-insurance amounts, certain IRA contributions, and student-loan interest. Not every taxpayer qualifies, and limits can change by tax year.
| Stage | High-level calculation | What it is not |
|---|---|---|
| Total income | Taxable income items combined under the return instructions | Not necessarily all cash received |
| AGI | Total income minus eligible adjustments to income | Not taxable income or tax owed |
| Taxable income | AGI reduced by the applicable standard or itemized deduction and other permitted deductions | Not the tax bill |
| Income tax before credits | Tax rules and rates applied to taxable income, with other computations where relevant | Not necessarily final tax |
| Tax after credits and payments | Tax calculation adjusted for credits, withholding, estimated payments, and other items | Not the same as economic after-tax income |
This is a simplified sequence. Additional taxes, limitations, deductions, credits, and special computations may apply. The governing forms and instructions control the actual return.
Assume a taxpayer has the following amounts for one tax year:
| Income item | Amount |
|---|---|
| Taxable wages | $72,000 |
| Taxable interest | $600 |
| Net freelance income | $12,400 |
| Total income | $85,000 |
Also assume the taxpayer qualifies under the applicable rules for:
| Adjustment to income | Amount |
|---|---|
| Deductible IRA contribution | $3,000 |
| Student-loan interest deduction | $900 |
| Total adjustments | $3,900 |
The illustrative AGI is:
The $81,100 is not taxable income. The taxpayer would next apply the deductions and other rules allowed for that tax year. It is also not tax owed: rates, credits, additional taxes, withholding, and payments enter later in the process.
The example assumes the taxpayer qualifies for both adjustments. In an actual return, income limits, filing status, employer-plan coverage, loan terms, and other requirements can change whether an amount is deductible.
| Measure | Basic meaning | Why it matters |
|---|---|---|
| Gross or total income | Income included under the applicable tax rules before adjustments | Starting point for the return calculation |
| AGI | Total income minus eligible adjustments to income | Base used by many federal and state computations |
| Modified Adjusted Gross Income | AGI modified as required by one specific tax rule | Determines eligibility, limits, or taxes under that rule |
| Taxable Income | Income remaining after the deductions and rules used to establish the taxable base | Amount to which income-tax rates generally apply |
| After-Tax Income | Income remaining after a defined set of taxes | Personal-finance or economic cash-flow measure, not a Form 1040 synonym for AGI |
There is no single MAGI formula for every purpose. A rule may start with AGI and add back or otherwise modify specified items. The MAGI used for one credit, contribution limit, health program, or additional tax may differ from the MAGI used for another.
The correct question is not simply “What is my MAGI?” It is “Which rule’s MAGI is being calculated, for which tax year?”
Standard or itemized deductions generally reduce the tax base after AGI. Credits generally reduce tax rather than AGI or taxable income. Confusing these stages can lead to incorrect estimates of a deduction’s or credit’s effect.
AGI or a rule-specific MAGI can affect eligibility for deductions, credits, retirement-account treatment, health-related provisions, and other tax benefits. The exact income measure, filing status, and threshold must be checked for the particular rule and year.
Some deductions or limitations are calculated using a percentage of AGI. A change to AGI can therefore affect another return item as well as the income base itself.
Prior-year AGI may be used as an identity-verification input for electronic filing. The IRS provides account and transcript options for locating prior-year information; the required entry should come from the relevant filed return or official record.
Some state returns begin with federal AGI and then apply state additions or subtractions. State definitions and conformity rules vary, so federal AGI should not be assumed to equal state taxable income or even the final state adjusted-income measure.
Transactions may affect AGI through both timing and classification. Examples include realizing a capital gain, receiving taxable interest, earning self-employment income, taking a taxable retirement distribution, or claiming an eligible adjustment to income.
However, AGI should not be managed in isolation. A transaction can lower current AGI while changing cash flow, investment risk, future tax, contribution flexibility, or penalties. A deduction also does not make an expense free; it generally reduces the relevant tax base rather than reimbursing the entire cost.
This article provides general U.S. federal tax education, not individualized tax, legal, accounting, retirement, or investment advice. Tax treatment depends on the tax year, filing status, transaction details, and other facts; verify current IRS guidance and consult a qualified professional when needed.