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What Is Adjusted Gross Income (AGI)?

Your AGI is the single most important number on your tax return. Here is what it means and why it matters.

Adjusted Gross Income: Definition

Adjusted Gross Income (AGI) is your total gross income minus specific deductions allowed by the IRS, known as "above-the-line" adjustments. AGI appears on line 11 of IRS Form 1040 and serves as the foundation for calculating your taxable income, determining eligibility for credits and deductions, and establishing thresholds for various tax benefits.

Think of AGI as a checkpoint between your total earnings and your final tax bill. Your gross income includes wages, salaries, tips, investment income, rental income, business income, and other sources. From this total, the IRS allows you to subtract certain qualified expenses to arrive at your AGI.

AGI is not the same as taxable income. After calculating your AGI, you further reduce it by either the standard deduction or itemized deductions to arrive at your taxable income, which is the amount actually subject to federal income tax rates.

How to Calculate AGI

The formula for AGI is straightforward:

AGI = Gross Income - Above-the-Line Deductions

What Counts as Gross Income

  • Wages, salaries, and tips (W-2 income)
  • Interest and dividends
  • Capital gains from investments
  • Business income or loss (Schedule C)
  • Rental income or loss (Schedule E)
  • Retirement distributions (pensions, IRAs, 401k withdrawals)
  • Unemployment compensation
  • Social Security benefits (taxable portion)
  • Alimony received (for agreements before 2019)

Common Above-the-Line Deductions

  • Educator expenses (up to $300)
  • Student loan interest (up to $2,500)
  • Traditional IRA contributions
  • Health Savings Account (HSA) contributions
  • Self-employment tax (50% of the SE tax paid)
  • Self-employed health insurance premiums
  • Alimony paid (for agreements before 2019)
  • Early withdrawal penalties on savings

Why AGI Matters

Your AGI is used throughout the tax code as a gatekeeper for credits, deductions, and thresholds. Here are the key reasons your AGI matters:

  • Standard vs. itemized deductions: Your AGI determines whether certain itemized deductions (like medical expenses) clear the threshold. Medical expenses, for example, are only deductible to the extent they exceed 7.5% of your AGI.
  • Tax credit eligibility: Many credits, including the Child Tax Credit, Earned Income Tax Credit, and education credits, phase out above certain AGI thresholds.
  • Roth IRA contributions: Your ability to contribute to a Roth IRA depends on your Modified Adjusted Gross Income (MAGI), which starts with AGI.
  • Premium Tax Credit: ACA marketplace insurance subsidies are based on household AGI relative to the federal poverty level.
  • State taxes: Many states, including Oregon, use federal AGI as the starting point for calculating state taxable income.

AGI vs. MAGI vs. Taxable Income

These three terms are related but distinct, and understanding the differences is important for accurate tax planning:

TermDefinitionUsed For
AGIGross income minus above-the-line deductionsStarting point for most tax calculations
MAGIAGI plus certain items added back (foreign income, tax-exempt interest, etc.)Roth IRA eligibility, Medicare premiums, ACA subsidies
Taxable IncomeAGI minus standard or itemized deductionsDetermines your actual tax bracket and tax owed

For most W-2 employees without foreign income or tax-exempt interest, AGI and MAGI are the same number. The distinction primarily affects higher-income taxpayers and those with more complex financial situations.

How to Find Your AGI

Your AGI appears on line 11 of your most recent IRS Form 1040. You can find your prior-year AGI through several methods:

  • Last year's tax return: Check line 11 of your 2024 Form 1040.
  • IRS Online Account: Create or sign into your account at IRS.gov to view your tax records.
  • Tax software: If you e-filed last year, your tax software should have your prior-year AGI stored.
  • IRS transcript: Request a tax return transcript by mail or online.

Knowing your prior-year AGI is essential because the IRS uses it as an identity verification step when you e-file your current year's return.

Strategies to Lower Your AGI

Reducing your AGI can unlock tax credits and deductions that phase out at higher income levels. Here are legitimate strategies to lower your AGI:

  • Maximize retirement contributions: Traditional 401(k) and IRA contributions reduce your AGI dollar for dollar, up to contribution limits.
  • Contribute to an HSA: If you have a high-deductible health plan, HSA contributions are above-the-line deductions.
  • Claim student loan interest: Deduct up to $2,500 in student loan interest paid.
  • Self-employed deductions: If self-employed, deduct the employer-equivalent portion of self-employment tax, health insurance premiums, and qualified business expenses.

Use the Oregon Income Tax Calculator to see how lowering your AGI affects both your federal and Oregon state tax liability.

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