To calculate your adjusted gross income, add up every source of taxable income you received during the year, then subtract the specific deductions the tax code allows before the standard or itemized deduction. The result lands on line 11 of Form 1040 and controls almost everything else on your return, including which credits you qualify for and how much of certain deductions you can claim.1Internal Revenue Service. Adjusted Gross Income The math is simple. The work is in knowing what belongs on each side of the subtraction.
Step 1: Total Your Taxable Income
Federal tax law defines gross income as income from whatever source, with only a short list of specific exclusions.2Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined In practice that means gathering every dollar you received and sorting it into categories.
Wages, salaries, and tips are the largest piece for most filers. Box 1 of your W-2 already reflects pretax payroll deductions like retirement contributions and health premiums, so that figure is the taxable amount you carry to your return.1Internal Revenue Service. Adjusted Gross Income If you worked more than one job, add every W-2 together.
Self-employment income is your net profit from a sole proprietorship, calculated on Schedule C by subtracting business expenses from gross receipts.3Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship) The net figure is what flows into your total income, not gross receipts.
Investment income comes in several forms. Taxable interest arrives on Form 1099-INT, dividends on Form 1099-DIV, and gains from selling stocks or other assets get computed on Form 8949 and summarized on Schedule D.4Internal Revenue Service. Topic No. 409, Capital Gains and Losses Cryptocurrency and other digital assets are treated as property, so gains and losses follow the same capital-gains rules as stock sales.5Internal Revenue Service. Digital Assets
Retirement distributions from traditional IRAs, 401(k) plans, and pensions are generally taxable in the year you receive them.6Internal Revenue Service. Retirement Plans FAQs Regarding IRAs Distributions (Withdrawals) Qualified distributions from a designated Roth account are typically tax-free and don’t increase your gross income.7Internal Revenue Service. Topic No. 410, Pensions and Annuities
Rental income and royalties go on Schedule E, which also handles income from partnerships, S corporations, and trusts.8Internal Revenue Service. About Schedule E (Form 1040), Supplemental Income and Loss Taxable refunds of state and local taxes are reported separately on Schedule 1, line 1.9Internal Revenue Service. 2025 Schedule 1 (Form 1040)
Social Security benefits may be partially taxable depending on your combined income. If you’re single and your total income plus half your Social Security exceeds $25,000, some of your benefits become taxable. For married couples filing jointly, that threshold is $32,000. At higher income levels, up to 85 percent of your benefits can be included.10Internal Revenue Service. IRS Reminds Taxpayers Their Social Security Benefits May Be Taxable
Smaller items count too. Gambling winnings are fully taxable and reported on Schedule 1. Jury duty pay is income, though if your employer kept paying your salary and required you to hand over the jury fees, you can deduct what you returned.11Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income
What Stays Out of the Total
A short list of receipts never enters gross income at all. Interest from municipal bonds issued by state and local governments has been excluded from federal income tax since 1913. Gifts and inheritances are excluded, as are most life insurance proceeds and qualified Roth IRA distributions. Adding income you don’t owe tax on will inflate your AGI and can cost you credits or deductions tied to income thresholds, so it matters to leave these out.
Step 2: Subtract Above-the-Line Adjustments
Once you have a total income figure, subtract the deductions the tax code lists as adjustments to income.12Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined These are called “above-the-line” because they come off before you decide whether to take the standard deduction or itemize. You can claim them either way.
Adjustments Most Filers Can Use
- Student loan interest, up to $2,500 in interest paid on qualified loans. Your lender sends Form 1098-E if you paid $600 or more. The deduction phases out at higher incomes; for 2026, the phase-out begins at $85,000 for single filers and $175,000 for married couples filing jointly.13Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction
- Traditional IRA contributions. For 2026, you can contribute up to $7,500 ($8,600 if you’re 50 or older) and deduct some or all of it, depending on whether you or your spouse participate in a workplace retirement plan and how much you earn. With no workplace plan on either side, the full deduction is available regardless of income.14Internal Revenue Service. Retirement Topics – IRA Contribution Limits15Internal Revenue Service. IRA Deduction Limits
- Health Savings Account contributions, if you’re enrolled in a high-deductible health plan. For 2026, the limit is $4,400 for self-only coverage and $8,750 for family coverage. Your HSA trustee reports contributions on Form 5498-SA, which you don’t attach to your return.16Internal Revenue Service. Notice 26-0517Internal Revenue Service. Form 5498-SA (Rev. December 2026) HSA, Archer MSA, or Medicare Advantage MSA Information
- Educator expenses, up to $350 for 2026 in unreimbursed classroom costs for K-12 teachers and other eligible educators. If both spouses are eligible educators filing jointly, the combined limit doubles to $700.
- Early withdrawal penalties on a CD or similar time-deposit account cashed out before maturity. The amount appears in Box 2 of Form 1099-INT or 1099-OID.18Internal Revenue Service. Penalties for Early Withdrawal
- Alimony paid under a divorce or separation agreement finalized on or before December 31, 2018. Agreements executed after that date get no deduction.19Internal Revenue Service. Divorce or Separation May Have an Effect on Taxes
If You’re Self-Employed
Two additional adjustments matter. You can deduct the employer-equivalent half of your self-employment tax, calculated on Schedule SE.20Internal Revenue Service. Topic No. 554, Self-Employment Tax And if you paid for your own health, dental, or long-term care insurance, you can deduct 100 percent of the premiums. The plan must be established under your business, and no deduction is allowed for any month you were eligible to join an employer-subsidized plan, including a spouse’s.21Internal Revenue Service. Instructions for Form 7206
Narrow Adjustments
A few adjustments apply only in specific situations. Active-duty members of the Armed Forces relocating on a permanent change of station can deduct unreimbursed moving costs on Form 3903, including transport of household goods, up to 30 consecutive days of storage, and travel to the new duty station. No other taxpayers currently qualify.22Internal Revenue Service. 2025 Instructions for Form 3903 Qualified performing artists who worked for at least two employers and had AGI of $16,000 or less before this deduction, plus fee-basis state and local government officials, can deduct unreimbursed business expenses on Form 2106.23Internal Revenue Service. Instructions for Form 2106 (2025)
Step 3: Do the Subtraction
Add up every source of taxable income and enter the total on line 9 of Form 1040. Add up all above-the-line adjustments on Schedule 1 and transfer the total to line 10. Subtract line 10 from line 9. The result on line 11 is your AGI.24Internal Revenue Service. Definition of Adjusted Gross Income
A concrete example. Say you earned $50,000 in wages, $12,000 in rental income, $8,500 from a side gig, and $500 in bond interest. Your gross income is $71,000. If you claimed a $250 educator expense deduction and $2,500 in student loan interest, your total adjustments are $2,750. Your AGI is $71,000 minus $2,750, or $68,250.1Internal Revenue Service. Adjusted Gross Income
AGI is not what you pay tax on. You still subtract either the standard deduction or your itemized deductions to reach taxable income. But AGI is the midpoint that governs almost every calculation that follows, which is why an error here cascades through the rest of the return.
Finding a Prior-Year AGI
When you e-file, the IRS uses last year’s AGI to verify your identity, and a wrong number is one of the most common reasons an electronically filed return gets rejected. The fastest way to look it up is your IRS Online Account, where you can select the tax year and view your records. If you can’t access an online account, request a free tax return transcript by calling the IRS automated transcript line at 800-908-9946 or by mailing Form 4506-T.25Internal Revenue Service. Get Your Tax Records and Transcripts The transcript shows the AGI on the return the IRS has on file, which is the number their system checks against.
AGI vs. Modified Adjusted Gross Income
Many tax benefits are tested against “modified adjusted gross income” (MAGI) rather than AGI, and there isn’t one universal definition. MAGI starts with your AGI and adds back certain deductions or excluded income; which items get added back depends on the specific benefit being calculated.26Internal Revenue Service. Modified Adjusted Gross Income
For IRA contribution purposes, MAGI adds back your IRA deduction and student loan interest deduction. For the premium tax credit, MAGI includes tax-exempt interest and the nontaxable portion of Social Security benefits. For the net investment income tax, MAGI adds back certain foreign earned income exclusions.
If you don’t have foreign income, tax-exempt interest, or other unusual items, your MAGI and AGI are often the same number. If you hold municipal bonds or exclude foreign earned income, the gap can be large enough to push you over a phase-out threshold you thought you were safely under.