AGI Explained: What Adjusted Gross Income Is and How to Calculate It

Quick Answer: What Is Adjusted Gross Income?

Adjusted Gross Income (AGI) is your total gross income minus specific deductions called above-the-line deductions (or adjustments to income). You'll find it on Form 1040, line 11.

Formula: Gross Income − Above-the-Line Deductions = AGI

AGI is the number the IRS uses to determine your eligibility for most tax credits, deductions, and phase-outs. Lowering your AGI can open up bigger tax breaks and a larger refund. Use the Tax Calculator US app to estimate yours.

What Is Adjusted Gross Income (AGI)?

Adjusted Gross Income is the number on Form 1040, line 11 that affects nearly every tax benefit on your return. The IRS uses AGI to decide whether you qualify for credits, how much of a deduction you can take, and whether certain tax provisions phase out.

Think of AGI as a two-step calculation:

1. Start with gross income. This includes wages, salaries, tips, interest, dividends, capital gains, business income, rental income, retirement distributions, unemployment compensation, and most other sources of income.
2. Subtract above-the-line deductions. These are specific adjustments listed on Schedule 1 (and the new Schedule 1-A) that you can claim regardless of whether you itemize or take the standard deduction.

The result is your AGI. It is not your final tax bill and not the amount you owe. It is the starting point the IRS uses for almost everything else on your return.

Why "above the line"?

The phrase refers to the line on Form 1040 where AGI appears. Deductions taken above that line reduce your AGI directly. Deductions taken below the line (the standard deduction or itemized deductions) reduce your taxable income but do not affect your AGI. This distinction matters because many tax benefits are gated by AGI, not taxable income.

Why AGI matters for e-filing

The IRS also uses your prior-year AGI as an identity verification step when you e-file. If you cannot provide the correct AGI from your previous return, the IRS will reject your electronic filing. You can look up your prior-year AGI through your IRS Online Account, a tax transcript, or your previous year's Form 1040, line 11.

How to Calculate Your AGI Step-by-Step

Calculating your AGI follows the same structure as the top half of Form 1040. Here is the process broken into three steps.

Step 1: Add up all gross income

Gross income includes every source of taxable income you received during the year:

• Wages and salaries (W-2, box 1)
• Tips (W-2, box 7)
• Interest and dividends (1099-INT, 1099-DIV)
• Capital gains and losses (Schedule D)
• Business income or loss (Schedule C)
• Rental and royalty income (Schedule E)
• Retirement distributions (1099-R), taxable portion
• Social Security benefits, taxable portion (up to 85%)
• Unemployment compensation (1099-G)
• Alimony received (pre-2019 agreements only)
• Other income (gambling winnings, jury duty pay, etc.)

This total goes on Form 1040, line 9.

Step 2: Identify your above-the-line deductions

These adjustments are listed on Schedule 1, Part II (lines 11-24) and the new Schedule 1-A. Common above-the-line deductions include:

• Educator expenses (up to $350)
• HSA contributions ($4,400 self-only / $8,750 family for 2026)
• Self-employment tax, deductible half
• Self-employed health insurance premiums
• SEP-IRA, SIMPLE, and qualified plan contributions
• Penalty on early withdrawal of savings
• Alimony paid (pre-2019 agreements only)
• Traditional IRA contributions (up to $7,500 / $8,600 if age 50+)
• Student loan interest (up to $2,500)
• Moving expenses (active-duty military only)

For 2026, the One Big Beautiful Bill Act added four new above-the-line deductions on Schedule 1-A:

• Qualified tips deduction: up to $25,000 (Sec. 70201)
• Qualified overtime pay deduction: up to $12,500 per taxpayer (Sec. 70202)
• Car loan interest deduction: up to $10,000 for U.S.-assembled vehicles (Sec. 70203)
• Senior deduction: $6,000 per qualifying individual age 65+ (Sec. 70103)

For a detailed breakdown of these new deductions, see our New Tax Deductions for 2026 guide.

Step 3: Subtract adjustments from gross income

The formula is simple:

Gross Income (line 9) − Total Adjustments (Schedule 1, line 26 + Schedule 1-A total) = AGI (line 11)

Your AGI then carries forward to the rest of your return. From there, you subtract either the standard deduction or your itemized deductions to arrive at taxable income.

AGI vs. MAGI vs. Taxable Income: What's the Difference?

These three numbers are related but serve different purposes. Understanding the hierarchy prevents confusion when reading about phase-outs and eligibility thresholds.

Adjusted Gross Income (AGI)

AGI is gross income minus above-the-line deductions. It appears on Form 1040, line 11. Most tax provisions use AGI as the baseline. You can calculate it using the steps in the previous section.

Modified Adjusted Gross Income (MAGI)

MAGI starts with your AGI and adds back certain deductions or exclusions. The catch: the exact items added back depend on which tax provision you are looking at. There is no single universal MAGI definition.

Common MAGI add-backs include:

• Foreign earned income exclusion (Form 2555)
• Tax-exempt interest (municipal bond interest)
• Non-taxable Social Security benefits
• IRA deduction (for certain IRA-related MAGI calculations)
• Student loan interest deduction (for education credit MAGI)
• Rental losses excluded under passive activity rules

For many taxpayers, MAGI and AGI are the same number. The add-backs only matter if you have foreign income, tax-exempt interest, or other specific items.

Taxable income

Taxable income is the final number your federal tax is calculated on. It equals AGI minus your standard deduction (or itemized deductions) and any qualified business income (QBI) deduction. It appears on Form 1040, line 15.

Which provisions use which number?

When you see a phase-out that references "MAGI," check which specific add-backs apply to that provision. The IRS publishes a MAGI reference page that lists the add-backs for common provisions.

Why Your AGI Matters: Credits, Deductions, and Phase-Outs It Controls

Your AGI directly determines how much you can claim for many tax benefits. Here are the major provisions gated by AGI or MAGI thresholds.

Credits that phase out

• Child Tax Credit: $2,200 per child in 2026. Begins to phase out at $200,000 AGI ($400,000 MFJ). The credit is reduced by $50 for every $1,000 over the threshold.
• Earned Income Tax Credit (EITC): Worth up to $8,231 for families with three or more children in 2026. Eligibility is based on AGI and earned income, with different thresholds by filing status and number of children.
• American Opportunity Tax Credit (AOTC): Phases out between $80,000-$90,000 MAGI ($160,000-$180,000 MFJ).
• Lifetime Learning Credit: Phases out between $80,000-$90,000 MAGI ($160,000-$180,000 MFJ).
• Premium Tax Credit: Available on a sliding scale based on household MAGI relative to the federal poverty level.

Deductions affected by AGI

• Medical expenses: Only the amount exceeding 7.5% of AGI is deductible. At $80,000 AGI, your floor is $6,000. At $50,000, it drops to $3,750.
• Senior deduction: The new $6,000 deduction phases out starting at $75,000 MAGI ($150,000 MFJ).
• SALT deduction: The $40,400 cap (TY 2026) phases down for filers with MAGI above $505,000.
• Pease-style limitation on itemized deductions: The OBBBA revived a modified version of the Pease limitation. Taxpayers with high AGI may see a reduction in their total itemized deductions.
• Student loan interest: The $2,500 deduction phases out at $85,000-$100,000 MAGI ($175,000-$205,000 MFJ).

Retirement account limits

• Traditional IRA deductibility: If you or your spouse has an employer retirement plan, the IRA deduction phases out at specific MAGI levels.
• Roth IRA contributions: Ability to contribute phases out at $153,000-$168,000 MAGI ($242,000-$252,000 MFJ) for 2026.

Net Investment Income Tax

An additional 3.8% tax applies to net investment income if your MAGI exceeds $200,000 ($250,000 MFJ). This surtax hits capital gains, interest, dividends, and rental income.

State taxes

Most states use federal AGI as the starting point for calculating state income tax. A lower federal AGI often means a lower state tax bill too.

7 Strategies to Lower Your AGI in 2026

Lowering your AGI is one of the best tax planning moves because it can restore credits and deductions that phase out at higher income levels. Here are seven strategies that work for the 2026 tax year.

1. Maximize pre-tax retirement contributions

Contributions to a traditional 401(k), 403(b), or 457 plan are excluded from your gross income before AGI is calculated. For 2026, the limit is $24,500 ($32,500 if you are 50 or older). This is the single largest AGI reducer available to most workers.

2. Fund a Health Savings Account (HSA)

HSA contributions are above-the-line deductions. The 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage. You must be enrolled in a high-deductible health plan to contribute. Employer contributions count toward these limits.

3. Claim the new tips and overtime deductions

If you work in a tipped occupation or earn overtime as an hourly employee, the OBBBA's new above-the-line deductions can reduce your AGI by up to $25,000 (tips) or $12,500 (overtime premium pay). These deductions phase out starting at $150,000 MAGI ($300,000 MFJ). See our complete guide to the new deductions for eligibility details.

4. Deduct student loan interest

You can deduct up to $2,500 in student loan interest paid during the year, even if you take the standard deduction. The deduction phases out between $85,000-$100,000 MAGI ($175,000-$205,000 MFJ).

5. Use tax-loss harvesting

Selling investments at a loss offsets capital gains dollar for dollar. If your losses exceed your gains, you can deduct up to $3,000 ($1,500 if married filing separately) against ordinary income, directly reducing your AGI. Unused losses carry forward to future years.

6. Make traditional IRA contributions

Contributing to a traditional IRA (up to $7,500 or $8,600 if 50+) gives you an above-the-line deduction. The deduction may be limited if you or your spouse is covered by an employer retirement plan and your MAGI exceeds certain thresholds. Even partial deductibility still lowers AGI.

7. Time income and deductions near year-end

If you are close to a phase-out threshold, consider deferring a bonus into the next year or accelerating deductible expenses into the current year. Freelancers and business owners have the most flexibility here. Shifting even a few thousand dollars of income across the year-end boundary can keep your AGI below a cutoff that qualifies you for a larger credit or deduction.

Want to see how these strategies affect your bottom line? The Tax Calculator US app lets you model different scenarios and compare your refund before and after adjustments.

How to Find Your Prior-Year AGI for E-Filing

When you e-file your tax return, the IRS requires your prior-year AGI as an identity verification step. If the number does not match their records, your e-filed return will be rejected. Here is how to find it.

Option 1: Check your previous tax return

Look at Form 1040, line 11 from the prior year. If you filed electronically, your tax software usually saves a copy.

Option 2: Use your IRS Online Account

Create or sign into your account at IRS.gov/your-account. Your AGI from your most recent processed return is available in your tax records.

Option 3: Request a transcript

Use the Get Transcript tool on IRS.gov or call the IRS to request a tax return transcript. Your AGI will be listed.

First-time filer or didn't file last year?

If you did not file a return for the prior year, enter $0 as your prior-year AGI when e-filing. If your prior-year return is still being processed by the IRS, you may also need to enter $0.

This is a common problem during filing season. Getting rejected for an AGI mismatch does not mean anything is wrong with your current return. It just means the verification number did not match.

AGI Calculation Examples for 2026

These examples show how AGI is calculated in common situations using 2026 figures. Your results depend on your specific income and deductions. Use the Tax Calculator US app to calculate your own AGI.

Frequently Asked Questions

Tips for Managing Your AGI

• Check your AGI before year-end. Run a rough AGI calculation in November or December so you have time to make adjustments: contribute more to a 401(k), fund an HSA, or harvest investment losses before December 31.
• Know which phase-outs affect you. Look up the AGI and MAGI thresholds for credits and deductions you typically claim. Even a small reduction in AGI can make a real difference if you are near a cutoff.
• Keep prior-year AGI accessible. Save a copy of your Form 1040 or screenshot your AGI each year. You will need it for e-filing identity verification the following year, and a mismatch causes a rejected return.
• Don't confuse 401(k) deductions with above-the-line deductions. Pre-tax 401(k) contributions reduce your W-2 box 1 wages before they hit your return, achieving the same effect as an above-the-line deduction. They do not appear on Schedule 1, but they still lower your AGI.
• Use the Tax Calculator US app to model scenarios. Plug in different income and deduction amounts to see how changes affect your AGI, credits, and estimated refund before you file.
• Remember that MAGI varies by provision. If you have foreign income, tax-exempt interest, or non-taxable Social Security, your MAGI may differ from your AGI. Check the specific add-backs for any credit or deduction you are evaluating.

References

• IRS: Adjusted Gross Income — Official IRS definition of adjusted gross income and how to find it on your tax return.
• IRS: Modified Adjusted Gross Income — IRS reference page explaining MAGI and which add-backs apply to different tax provisions.
• IRS: Lowering AGI This Year Can Help Taxpayers — IRS guidance on above-the-line deductions and strategies to reduce adjusted gross income.
• IRS: Tax Inflation Adjustments for Tax Year 2026 (IR-2025-103) — Official 2026 inflation-adjusted amounts for deductions, credits, and thresholds, including OBBBA amendments.
• IRS: Validating Your Electronically Filed Tax Return — IRS guidance on the prior-year AGI requirement for e-file identity verification.
• IRS: Schedule 1 (Form 1040) -- Additional Income and Adjustments — Official IRS Schedule 1 form listing all adjustments to income used to calculate AGI.