Your adjusted gross income (AGI) is your total income for the year minus a specific set of deductions the IRS allows you to subtract before you calculate your taxes. You can find it on line 11 of Form 1040. AGI matters because it determines your eligibility for dozens of tax credits, deductions, and other financial benefits, from education credits to retirement contribution limits.
How AGI Is Calculated
The formula is straightforward: start with all the money you earned or received during the year, then subtract certain qualifying deductions. Your total income includes wages, salaries, tips, interest, dividends, capital gains, rental income, business income, retirement distributions, and most other sources of money that flow to you in a given year.
From that total, you subtract what the IRS calls “adjustments to income,” sometimes referred to as above-the-line deductions. These are different from the standard deduction or itemized deductions you take later. You claim them on Schedule 1 of your tax return, and their total gets subtracted from your gross income to produce your AGI on line 11 of Form 1040. Everything else on your return, including which credits you qualify for and how large your standard deduction is, flows from that number.
Adjustments That Lower Your AGI
Not everyone has adjustments to claim. If you’re a W-2 employee with no student loans, no retirement contributions outside of a workplace plan, and no health savings account, your AGI may simply equal your gross income. But if any of the following apply to you, they reduce your AGI dollar for dollar:
- Student loan interest deduction: Interest you paid on qualified student loans, up to the annual limit.
- IRA contributions: Deductible contributions to a traditional IRA.
- Health savings account (HSA) contributions: Money you put into an HSA, whether through payroll or on your own.
- Self-employment tax: If you’re self-employed, you can deduct half of the self-employment tax you owe.
- Self-employed retirement contributions: Contributions to a SEP-IRA, SIMPLE IRA, or solo 401(k).
- Self-employed health insurance premiums: Premiums you pay for yourself, your spouse, and your dependents if you’re self-employed.
- Educator expenses: Classroom supplies and materials paid out of pocket by eligible teachers.
- Penalty on early withdrawal of savings: If a bank charged you a penalty for breaking a CD early, that amount is deductible.
- Alimony paid: For divorce agreements finalized before 2019, alimony payments reduce the payer’s AGI.
There are a handful of less common adjustments as well, including moving expenses for active-duty military, certain business expenses for reservists and performing artists, and jury duty pay you turned over to your employer. Most taxpayers will only use a few of these, if any.
Why AGI Controls So Much of Your Tax Return
AGI acts as a gatekeeper for nearly every tax benefit on your return. Credits and deductions don’t just appear or disappear at random. They phase out, meaning they gradually shrink, as your AGI climbs past certain thresholds. A few examples illustrate how this works in practice.
The Lifetime Learning Credit, which helps offset the cost of higher education, phases out for single filers with modified AGI between $80,000 and $90,000 (between $160,000 and $180,000 for joint filers). If your AGI falls below the lower end of that range, you get the full credit. If it lands in the middle, you get a partial credit. Above the upper end, you get nothing.
The same pattern applies to the child tax credit, the earned income tax credit, the ability to deduct traditional IRA contributions when you’re covered by a workplace plan, Roth IRA contribution eligibility, and premium tax credits for health insurance purchased through the marketplace. Even the alternative minimum tax (AMT) uses AGI-based thresholds to determine whether its exemption begins to phase out. For 2026, that phase-out starts at $500,000 for single filers and $1,000,000 for married couples filing jointly.
Because so many benefits hinge on AGI, lowering it by even a few thousand dollars can sometimes push you below a threshold and unlock a credit or deduction you’d otherwise lose.
AGI vs. Modified Adjusted Gross Income
You’ll sometimes see the term “modified adjusted gross income,” or MAGI, on IRS forms and eligibility guidelines. MAGI starts with your AGI and adds back certain deductions or exclusions that were previously subtracted. The catch is that there’s no single MAGI formula. The items you add back depend on which specific tax benefit or program is being evaluated.
Common items added back include the IRA deduction, the student loan interest deduction, foreign earned income excluded on Form 2555, employer-provided adoption benefits, and excludable savings bond interest. As a simple example: if your AGI is $40,000 and the relevant add-back items for a particular credit total $1,750, your MAGI for that credit is $41,750.
For many taxpayers, MAGI and AGI are identical or very close. The distinction only matters when you claim one of the specific deductions or exclusions that get added back, and even then, it only affects the particular benefit that uses that version of MAGI.
Where to Find Your AGI
If you need your AGI from a prior year, the easiest place to look is line 11 of the Form 1040 you filed. You’ll need last year’s AGI to verify your identity when e-filing a new return, and lenders or government programs sometimes request it as proof of income.
If you don’t have a copy of your old return, you can request a tax transcript from the IRS through their online account portal or by filing Form 4506-T. Tax software typically carries your prior-year AGI forward automatically, but if you switched providers or filed by hand, having a copy of last year’s return on hand saves time.
Strategies to Lower Your AGI
Because AGI influences so many parts of your tax picture, reducing it is one of the most effective ways to lower your overall tax bill. The most accessible strategies involve contributing to tax-advantaged accounts. Every dollar you put into an HSA, a deductible IRA, or a self-employed retirement plan directly reduces your AGI.
If you’re self-employed, the adjustments available to you are particularly powerful. The deductible half of self-employment tax, retirement plan contributions, and health insurance premiums can collectively reduce AGI by tens of thousands of dollars. W-2 employees have fewer levers, but HSA contributions and traditional IRA deductions (when eligible) still help.
Timing matters too. If you expect a spike in income one year, front-loading deductible contributions before year-end can keep your AGI below a phase-out threshold. Conversely, if you’re in a low-income year, it may make sense to skip the deductible IRA contribution and contribute to a Roth instead, since the tax benefit of lowering AGI is smaller when your income is already low.