Is AGI the Same as Taxable Income? Deductions and MAGI

Adjusted gross income and taxable income are not the same number. Both appear on Form 1040 and both start from what you earned, but AGI lands on line 11 after a specific set of adjustments, and taxable income shows up on line 15 after you subtract your standard or itemized deduction and a few other items from AGI. The gap between them is rarely small: for 2026, a single filer’s standard deduction alone is $16,100, so taxable income will be at least that much lower than AGI before anything else comes off.¹

The Short Answer, With the Numbers

Three figures sit on your return in a fixed order, and each one is smaller than the last.

Gross income comes first. Federal law defines it as “all income from whatever source derived,” which sweeps in wages, tips, business profits, rental income, interest, dividends, capital gains, retirement distributions, alimony from pre-2019 agreements, and even canceled debt.² If money came in and no specific exclusion applies, it counts.

AGI is next. It’s gross income minus a defined set of adjustments listed in the code, totaled on Schedule 1 and recorded on line 11 of Form 1040.³⁴

Taxable income comes last. It’s AGI minus your standard or itemized deduction, minus the qualified business income deduction if you qualify, and it lives on line 15.⁵⁶ This is the number the tax brackets act on.

So when someone asks whether AGI equals taxable income, the answer is no in every case where you take any deduction at all, which is almost everyone. Taxable income is always AGI or lower, never higher.

What Comes Out to Get to AGI

The adjustments that turn gross income into AGI are often called “above-the-line” deductions because they sit above the AGI line on Schedule 1. You claim them regardless of whether you later take the standard deduction or itemize. The main ones for 2026:

Educator expenses up to $300 for eligible K–12 teachers who pay for classroom supplies out of pocket.⁷
Up to $2,500 of student loan interest, subject to income phase-outs.⁸
Traditional IRA contributions up to $7,500, or $8,600 if you’re 50 or older, though the deduction phases out if you or your spouse are covered by a workplace retirement plan.⁹
HSA contributions up to $4,400 for self-only coverage or $8,750 for family coverage.¹⁰
Half of your self-employment tax, if you’re self-employed.¹¹
Self-employed health insurance premiums, if you have a net profit and no access to an employer-subsidized plan through a spouse.¹²
Alimony paid under divorce or separation agreements finalized before 2019.¹³
Penalties charged by a bank for breaking a CD or other time deposit early.¹⁴
Moving expenses for active-duty members of the Armed Forces relocating under a permanent change of station.

Total those, subtract them from gross income, and you have AGI.

What Comes Out to Get to Taxable Income

Between AGI and taxable income sit the below-the-line deductions. The largest one for most filers is the standard deduction or, if it’s bigger, the total of itemized deductions on Schedule A. You pick one; you can’t take both.

Standard Deduction

For 2026, the standard deduction is $16,100 for single filers or married filing separately, $32,200 for married filing jointly or a surviving spouse, and $24,150 for head of household.¹ Filers who are 65 or older or legally blind receive an additional amount on top of the base. For 2025 the additional amount was $1,600 for married filers and $2,000 for unmarried filers per qualifying condition; the 2026 figures should be similar or slightly higher after inflation adjustments.¹⁵

Itemized Deductions

Itemizing makes sense when your individual deductible expenses beat the standard deduction. The common categories:

Medical and dental expenses, but only the portion exceeding 7.5% of AGI. On an $80,000 AGI, the first $6,000 in medical costs does nothing; only amounts above that reduce taxable income.¹⁶
State and local taxes, capped at $40,400 for most filers in 2026 ($20,200 if married filing separately). The cap was raised from $10,000 by legislation signed in mid-2025 and is scheduled to gradually decrease after 2030.
Mortgage interest on up to $750,000 of debt used to buy, build, or improve your primary or second home.
Charitable contributions to qualified organizations, generally limited to 60% of AGI for cash gifts.

Two of those limits ride directly on AGI, which is one reason the two numbers behave so differently: AGI itself controls how much of your itemized total you’re allowed to claim.

Qualified Business Income Deduction

If you have income from a sole proprietorship, partnership, or S corporation, Section 199A lets you subtract up to 20% of your qualified business income.¹⁷ The deduction was originally set to expire after 2025 but was made permanent by the One Big Beautiful Bill Act signed in July 2025, which also expanded the income thresholds where the deduction phases out. It’s taken after the standard or itemized deduction, on line 13.⁶

Subtract your standard or itemized deduction, then the QBI deduction if it applies, and line 15 shows your taxable income.

Why the Difference Actually Matters

AGI doesn’t set your tax. Taxable income does. But AGI acts as a gatekeeper for a long list of benefits, so getting it wrong can quietly cost you deductions and credits you thought you had. Places where AGI (or a close variant) controls eligibility in 2026:

Traditional IRA deductibility, if you’re covered by a workplace retirement plan, phases out between $81,000 and $91,000 for single filers and between $129,000 and $149,000 for joint filers.⁹
The student loan interest deduction phases out entirely at $100,000 for single filers or $200,000 for joint filers.¹⁸
The Child Tax Credit of up to $2,200 per qualifying child begins to phase out above $200,000 of income ($400,000 for joint filers).¹⁹
The medical expense floor of 7.5% of AGI shrinks your deductible medical costs as AGI rises.¹⁶
ACA marketplace premium tax credits are based on household income measured against the federal poverty level, using a modified version of AGI.

Taxable income, by contrast, does one thing: it drops into the federal brackets to produce your tax. For 2026, single filers pay 10% up to $12,400, 12% up to $50,400, 22% up to $105,700, 24% up to $201,775, 32% up to $256,225, 35% up to $640,600, and 37% above that. Joint brackets run 10% up to $24,800, 12% up to $100,800, 22% up to $211,400, 24% up to $403,550, 32% up to $512,450, 35% up to $768,700, and 37% above.¹

These are marginal rates, so each rate applies only to the income inside its band. A single filer with $60,000 of taxable income pays 10% on the first $12,400, 12% on the next $38,000, and 22% on the remaining $9,600. The effective rate works out to about 12.4%.

Where the AGI-versus-taxable-income distinction has real dollar consequences: imagine your AGI is $90,000 and you take the $16,100 standard deduction. Taxable income drops to $73,900, comfortably inside the 22% bracket. Treat AGI as if it were taxable income and you’ll significantly overstate what you owe.

A Note on MAGI

Some of the AGI-based thresholds mentioned above actually run on Modified Adjusted Gross Income, not plain AGI. MAGI starts with AGI and adds back certain items that were excluded or deducted, and there isn’t a single universal formula: the add-backs depend on which benefit you’re calculating.²⁰ For traditional IRA deductibility, MAGI adds back the IRA deduction itself, the student loan interest deduction, and the foreign earned income exclusion, among other items. For the premium tax credit, it adds back foreign earned income, tax-exempt interest, and nontaxable Social Security benefits. For most W-2 employees with only domestic income, MAGI and AGI are the same number. The distinction mostly matters if you have foreign income, tax-exempt interest, or Social Security benefits.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Office of the Law Revision Counsel. 26 U.S. Code 61 – Gross Income Defined
3
Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined
4
Internal Revenue Service. Adjusted Gross Income
5
Office of the Law Revision Counsel. 26 USC 63 – Taxable Income Defined
6
Internal Revenue Service. Form 1040
7
Internal Revenue Service. Topic No. 458, Educator Expense Deduction
8
Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction
9
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
10
Internal Revenue Service. Notice 2026-05 – HSA Inflation Adjustments
11
Internal Revenue Service. Topic No. 554, Self-Employment Tax
12
Internal Revenue Service. Instructions for Form 7206
13
Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
14
Internal Revenue Service. Penalties for Early Withdrawal – IRS Courseware
15
Internal Revenue Service. Topic No. 551, Standard Deduction
16
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
17
Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income
18
Internal Revenue Service. Publication 970 (2025), Tax Benefits for Education – Section: Student Loan Interest Deduction
19
Internal Revenue Service. Child Tax Credit
20
Internal Revenue Service. Modified Adjusted Gross Income