Is Adjusted Gross Income Before or After Standard Deduction?

Adjusted gross income is calculated before the standard deduction. On Form 1040, AGI lands on line 11, and only after that number is set do you subtract either the standard deduction or itemized deductions to arrive at taxable income. So the order runs gross income, then AGI, then the standard deduction, then taxable income.¹

That sequence isn’t just a formatting quirk of the return. AGI is the figure the IRS uses to test eligibility for a long list of credits, deductions, and contribution limits, and the standard deduction never enters those tests. Understanding what goes into AGI, and what comes off after it, is the whole answer.

How AGI Is Built

AGI starts with gross income, which the tax code defines broadly: wages, salaries, interest, dividends, capital gains, business profits, rental income, retirement distributions, and more.² From that total, you subtract a specific group of deductions the IRS calls “adjustments to income.” What’s left is your AGI.¹

These adjustments are often called “above-the-line” deductions because they sit above the AGI line on the return. They’re listed in Section 62 of the Internal Revenue Code and reported on Schedule 1 of Form 1040.³ You claim them whether or not you take the standard deduction, which is why they’re valuable in a way the standard deduction is not: they lower AGI itself.

Common above-the-line adjustments include:

Educator expenses, up to $300 for eligible K-12 teachers ($600 on a joint return where both spouses teach, capped at $300 each).⁴
Student loan interest, up to $2,500 per year, subject to income limits.⁵
Health Savings Account contributions. For 2026, the limits are $4,400 for self-only coverage and $8,750 for family coverage.⁶
The employer-equivalent half of self-employment tax.⁷
SEP IRA and SIMPLE IRA contributions by self-employed individuals.
Alimony payments, but only if the divorce or separation agreement was finalized before 2019. Agreements executed after December 31, 2018, don’t qualify.⁸
Early withdrawal penalties charged for breaking a CD or other time deposit.

Gross income minus these adjustments equals AGI. Nothing about the standard deduction has happened yet.

Where the Standard Deduction Comes In

Once AGI is set, you choose how to reduce it further: take the standard deduction or itemize on Schedule A, whichever saves more.⁹ Both are “below-the-line” because they come after the AGI line.

The standard deduction is a flat amount the IRS adjusts each year for inflation. For the 2026 tax year:¹⁰

Single or married filing separately: $16,100
Married filing jointly or surviving spouse: $32,200
Head of household: $24,150

Filers who are 65 or older or blind get an additional standard deduction amount on top of these figures. Roughly 90 percent of taxpayers take the standard deduction because it exceeds what they could itemize.

Whichever route you take, the deduction is subtracted from AGI, not before it. Your AGI is the same number either way.

A Worked Example

Here is the two-step subtraction for a single filer with $100,000 in gross income and $3,000 in above-the-line adjustments, using 2026 figures:

Gross income: $100,000
Above-the-line deductions: -$3,000
AGI: $97,000
Standard deduction (single): -$16,100
Taxable income: $80,900

Taxable income is what runs through the federal brackets, which for 2026 range from 10% on the first $12,400 of taxable income up to 37% on income above $640,600 for single filers.¹⁰ The system is progressive: only the income within each bracket is taxed at that bracket’s rate.¹¹ Credits then come off the calculated tax.

Why the Ordering Matters

Because AGI is fixed before the standard deduction, the standard deduction has no effect on any tax rule keyed to AGI. And a lot of rules are keyed to AGI or to modified AGI (a closely related figure discussed below). An AGI a few hundred dollars over a threshold can eliminate a benefit worth thousands.

Roth IRA Contributions

For 2026, single filers with modified AGI between $153,000 and $168,000 can make a reduced Roth IRA contribution; above $168,000, direct contributions are barred. Married couples filing jointly phase out between $242,000 and $252,000.¹²

Traditional IRA Deduction

If you or your spouse are covered by a workplace retirement plan, the traditional IRA deduction phases out. For 2026, single filers covered at work lose the full deduction once modified AGI reaches $91,000; for married couples filing jointly the phase-out ends at $149,000.¹²

Child Tax Credit

The Child Tax Credit starts to shrink once AGI exceeds $200,000 for single filers or $400,000 for joint filers. It drops by $50 for every $1,000 above the threshold.

Medical Expense Deduction

If you itemize, you can only deduct medical and dental costs that exceed 7.5% of your AGI.¹³ At $97,000 AGI, the first $7,275 of medical expenses produces no deduction. Lowering AGI (say, by contributing more to an HSA) lowers that floor.

Social Security Benefit Taxation

Retirees may owe tax on Social Security based on “combined income,” which is AGI plus nontaxable interest plus half of Social Security benefits. For single filers, up to 50% of benefits become taxable once combined income passes $25,000, and up to 85% above $34,000. For joint filers, those thresholds are $32,000 and $44,000.¹⁴

Net Investment Income Tax

A 3.8% tax applies to net investment income when modified AGI exceeds $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately). These thresholds are not indexed for inflation.¹⁵

In every one of these tests, the standard deduction is invisible. What matters is the AGI you already locked in before you got to it.

A Note on Modified AGI

Several thresholds above reference “modified adjusted gross income” instead of AGI. MAGI starts with AGI and adds back certain items, and the exact add-backs depend on which provision you’re calculating it for.¹⁶ For most domestic filers without foreign income, tax-exempt interest, or certain education-related deductions, MAGI equals AGI. When they differ, MAGI is always equal to or higher than AGI. Either way, MAGI is also computed before the standard deduction.

Finding Your AGI

Your AGI appears on line 11 of Form 1040.¹ If you need your prior-year AGI to e-file, you can pull it from your IRS online account under the Tax Records tab, from last year’s tax software, or by requesting a transcript at 800-908-9946.¹⁷ First-time filers enter zero. If last year’s return is still being processed, enter $0 so the IRS accepts your electronic filing.

1
Internal Revenue Service. Adjusted Gross Income
2
Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined
3
Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined
4
Internal Revenue Service. Topic No. 458, Educator Expense Deduction
5
Internal Revenue Service. Publication 970 (2025), Tax Benefits for Education
6
Internal Revenue Service. Expanded Availability of Health Savings Accounts Under the One, Big, Beautiful Bill Act
7
Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
8
Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
9
Internal Revenue Service. Deductions for Individuals: What They Mean and the Difference Between Standard and Itemized Deductions
10
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
11
Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
12
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
13
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
14
Internal Revenue Service. Publication 915 (2025), Social Security and Equivalent Railroad Retirement Benefits
15
Internal Revenue Service. Net Investment Income Tax
16
Internal Revenue Service. Modified Adjusted Gross Income
17
Internal Revenue Service. Validating Your Electronically Filed Tax Return