Adjusted gross income is your total income for the year minus a specific set of deductions the tax code lets you take before anything else on your return. You’ll find your AGI on Line 11 of Form 1040, and it’s the most consequential number on the form: nearly every credit, deduction, and phase-out threshold in the federal tax code is measured against it.1Internal Revenue Service. Adjusted Gross Income A lower AGI doesn’t just shrink the income you’re taxed on. It can also unlock benefits that disappear at higher income levels.
The Starting Point: Gross Income
Federal law defines gross income broadly, as all income from whatever source, unless a specific provision excludes it.2Office of the Law Revision Counsel. 26 US Code 61 – Gross Income Defined For most filers, that means adding up:
- Wages, salaries, tips, bonuses, and commissions reported on your W-2
- Net self-employment, freelance, or sole-proprietor income
- Taxable interest, dividends, and capital gains
- Distributions from traditional IRAs, pensions, and annuities (qualified Roth IRA distributions are excluded)
- Rental and royalty income
- Unemployment compensation
- Alimony from divorce agreements finalized before 2019; agreements executed after December 31, 2018, don’t count, because the Tax Cuts and Jobs Act eliminated the inclusion requirement for newer agreements3Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
Whatever this total comes to, it’s just the starting figure. The tax code lets you knock a specific list of items off before you land on AGI.
The Adjustments That Get You to AGI
Deductions taken before the AGI line are called “above-the-line” adjustments, and they’re available whether you take the standard deduction or itemize.4Office of the Law Revision Counsel. 26 US Code 62 – Adjusted Gross Income Defined That makes them more broadly useful than itemized deductions. The main ones:
Retirement Contributions
Traditional IRA contributions reduce AGI up to the annual limit of $7,500 for 2026, though the deduction may be reduced or eliminated if you or your spouse is covered by a workplace retirement plan.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Self-employed contributions to a SEP-IRA, SIMPLE IRA, or solo 401(k) also come off the top.
Health Savings Account Contributions
HSA contributions are deductible above the line. For 2026, the limits are $4,400 for self-only coverage and $8,750 for family coverage.6Internal Revenue Service. Notice 26-05 – 2026 HSA Contribution Limits You report the deduction on Form 8889.7Internal Revenue Service. About Form 8889, Health Savings Accounts (HSAs)
Self-Employment Adjustments
If you work for yourself, you can deduct half of the self-employment tax you pay, which offsets the fact that you cover both the employee and employer portions of Social Security and Medicare.8Internal Revenue Service. Topic No. 554, Self-Employment Tax Health insurance premiums for yourself, your spouse, and your dependents are generally deductible in full above the line, though you can’t claim months where you were eligible for a subsidized employer plan.9Internal Revenue Service. 2025 Instructions for Form 7206
Student Loan Interest
You can deduct up to $2,500 in student loan interest paid during the year.10Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction The deduction phases out as modified AGI rises: for 2026, single filers lose it between $85,000 and $100,000, and joint filers between $175,000 and $205,000. Lenders send Form 1098-E if they collect $600 or more in interest from you.11Internal Revenue Service. Publication 970 (2025), Tax Benefits for Education – Section: Student Loan Interest Deduction
Educator Expenses
K-12 teachers, counselors, and principals who work at least 900 hours in a school year can deduct up to $300 in unreimbursed classroom costs like books, supplies, and software. Two eligible educators filing jointly can deduct up to $600 combined.12Internal Revenue Service. Topic No. 458, Educator Expense Deduction
Military Moving Expenses
Active-duty service members can deduct unreimbursed moving expenses for a permanent change of station, a benefit civilians lost after 2017.13Internal Revenue Service. 2025 Instructions for Form 3903 Moving Expenses
Early Withdrawal Penalties
If your bank charged an early withdrawal penalty on a CD or similar savings product, that penalty is deductible above the line. It’s easy to overlook because the bank has already taken the money and you may never think of it as a tax break.
Why AGI Matters More Than the Number Suggests
AGI isn’t the amount you actually pay tax on. After Line 11, you subtract either the standard deduction or your itemized deductions to reach taxable income, which is what runs through the brackets. What makes AGI decisive is that most of the benefits sitting between AGI and taxable income are gated by AGI itself.
The 7.5% Medical Floor
If you itemize, medical and dental expenses are deductible only to the extent they exceed 7.5% of AGI.14Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: How Much of the Expenses Can You Deduct? On an AGI of $80,000, only expenses above $6,000 count. Push AGI down by $10,000 through retirement contributions and the floor drops to $5,250.
Child Tax Credit
For 2026, the Child Tax Credit is worth up to $2,200 per qualifying child. You get the full credit at AGI of $200,000 or less ($400,000 for joint filers). Above those thresholds, it shrinks by $50 for every $1,000 of excess income.15Internal Revenue Service. Child Tax Credit
Earned Income Tax Credit
AGI is the primary eligibility filter for the EITC. Ceilings shift with filing status and the number of qualifying children. For 2025, a single filer with three or more children lost eligibility at $61,555, and a joint filer at $68,675, with 2026 figures moving up slightly for inflation.16Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
Traditional IRA Deduction Phase-Outs
If you or your spouse participates in a workplace retirement plan, AGI controls how much of a traditional IRA contribution you can actually deduct. For 2026, a single filer covered by a workplace plan loses the deduction between $81,000 and $91,000. For joint filers where the contributing spouse has a workplace plan, the range is $129,000 to $149,000. If only your spouse is covered, the phase-out doesn’t start until $242,000.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Social Security Benefit Taxation
Retirees often don’t realize AGI decides whether Social Security benefits get taxed. The IRS calculates “combined income” as AGI plus nontaxable interest plus half of your Social Security benefits. Single filers with combined income between $25,000 and $34,000 see up to 50% of benefits taxed; above $34,000, up to 85%. Joint filers hit the same tiers at $32,000 to $44,000 and above $44,000. Those thresholds have never been indexed to inflation.
AGI vs. Modified AGI
Some tax provisions use modified adjusted gross income instead of plain AGI. MAGI starts with AGI and adds back certain items, most commonly untaxed foreign income, nontaxable Social Security benefits, and tax-exempt interest.17HealthCare.gov. Modified Adjusted Gross Income (MAGI) For filers who don’t have foreign income or municipal bond interest, MAGI and AGI are usually identical.
MAGI determines eligibility for Roth IRA contributions. In 2026, single filers can contribute the full amount with MAGI up to $153,000, phasing out completely at $168,000. Joint filers phase out between $242,000 and $252,000.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 MAGI also drives the student loan interest phase-out and eligibility for Affordable Care Act premium tax credits on marketplace health coverage. If you’re near any of these thresholds, the distinction between AGI and MAGI is worth checking carefully.
Finding Your AGI
AGI sits on Line 11 of Form 1040 or Form 1040-SR.1Internal Revenue Service. Adjusted Gross Income Most state returns use the same figure as their starting point for calculating state income tax, so an error here shows up in two places.
You’ll also need your prior-year AGI when you e-file, because the IRS uses it to verify your identity in place of a physical signature.18Internal Revenue Service. Validating Your Electronically Filed Tax Return If last year’s return isn’t handy, you can retrieve the number through your IRS Online Account or by requesting a free tax return transcript.1Internal Revenue Service. Adjusted Gross Income Tax software usually carries the figure forward automatically for returning customers, but first-time filers and anyone who switched software will need to look it up.