What is Adjusted Gross Income (AGI)?

AGI is your total taxable income minus specific "above-the-line" adjustments (IRA, HSA, student loan interest, half of SE tax, educator expenses, etc.). It appears on Form 1040 Line 11 in 2026. AGI is the gateway to many tax benefits — IRA contribution limits, Roth phase-outs, child tax credit, ACA subsidies, and itemized deduction floors all depend on AGI.

What is the difference between AGI and gross income?

Gross income is everything taxable — wages, interest, dividends, business profit, capital gains. AGI is gross income minus IRC §62 above-the-line adjustments. The adjustments are pre-defined by the IRS — you cannot pick and choose. Itemized vs standard deduction comes LATER, taking AGI down to taxable income.

What goes into "Total Income" on Form 1040?

Form 1040 Line 9 (Total Income) includes: wages (line 1), interest (2b), dividends (3b), IRA/pension distributions (4b/5b), Social Security taxable portion (6b), capital gains (7), Schedule 1 additional income, business income. The exact line numbers shift between tax years.

How is the student loan interest deduction calculated?

Per IRC §221, up to $2,500 of student loan interest is deductible above-the-line. The deduction phases out between AGI $80K-$95K (single) and $165K-$195K (MFJ) for tax year 2026. Calculator caps the student loan input at $2,500 to reflect this maximum.

What are the HSA contribution limits?

For 2026: $4,300 single coverage / $8,550 family coverage. Plus $1,000 catch-up if 55+. Contributions are an above-line deduction on Schedule 1 line 13. You must have a High-Deductible Health Plan (HDHP) to contribute. HSAs are triple-tax-advantaged.

How is half of SE tax deducted?

Per IRC §164(f), self-employed taxpayers deduct half of their SE tax above-the-line. If your SE tax (Schedule SE) is $13,415, you deduct $6,708. This mirrors how an employer would otherwise pay half of payroll tax for a W-2 employee.

Is there a maximum IRA deduction?

Traditional IRA deduction limit is $7,000 for 2026 ($8,000 if 50+). Deduction phases out by income if you (or spouse) have a workplace plan. SEP-IRA limit is much higher: up to 25% of net SE earnings, capped at $69,000. The calculator accepts any positive value — verify against your plan.

Why does AGI matter for the Child Tax Credit?

The Child Tax Credit begins phasing out at AGI $200K (single) / $400K (MFJ). Per TCJA 2017, the credit is $2,000 per qualifying child under 17, with $1,700 refundable in 2026 (ACTC). Above the phase-out threshold the credit reduces $50 for every $1,000 of AGI over.

What is the relationship between AGI and MAGI?

MAGI (Modified AGI) starts with AGI and adds back certain items (foreign earned income exclusion, tax-exempt bond interest, student loan deduction). MAGI is the threshold for Roth IRA contributions, ACA Premium Tax Credit, and Net Investment Income Tax. See our MAGI calculator for the add-backs.

Did the 1913 Revenue Act create AGI?

No — the 1913 Internal Revenue Act introduced the modern income tax under the Sixteenth Amendment, but the concept of AGI was formalized in the 1944 Individual Income Tax Act. Pre-1944 the form asked for gross income and itemized deductions only. AGI was created to give a single number for phase-out calculations.

Does AGI include retirement distributions?

Yes — taxable IRA/401(k)/pension distributions are part of Total Income (Form 1040 line 4b / 5b). Roth IRA qualified distributions are NOT included. The taxable portion of Social Security (up to 85% based on combined income) IS included.

Why does the form line up yellow?

The form background is a parchment-yellow (Legitlads input-area convention bg-yellow-50) and the line items light up blue (income) or amber (adjustments) as you type. This mirrors the IRS's own e-Filer fillable PDF, which uses subtle line highlighting on Form 1040.

Live IRS Form 1040

AGI Calculator

To compute your Adjusted Gross Income, sum every taxable income line on Form 1040 (wages, interest, dividends, business, capital gains) then subtract above-the-line adjustments (IRA, HSA, student loan up to $2,500, educator, ½ SE tax). Result: AGI = Total Income − Adjustments on Line 11.

$76,550

AGI (line 11)

$85,550

Total income

-$9,000

Adjustments

10.5%

Adj as % income

Line 11. The gateway number.

Quick Conversion

FROM (Total Income ($))

TO (AGI ($))76,000

adj ($)

Formula: AGI = Total Income − Adjustments

Live IRS Form 1040 — AGI flow

Income

Wages

Interest

Dividends

Business

Capital gains

Adjustments (above-line)

IRA

HSA

SLID (≤$2,500)

Educator

½ SE tax

Scenario label

Common filer presets

AGI by income & adjustments (assume Adj = 12% of Income)

Total Income	Adj	AGI
$30,000	-$3,600	$26,400
$50,000	-$6,000	$44,000
$75,000	-$9,000	$66,000
$100,000	-$12,000	$88,000
$125,000	-$15,000	$110,000
$150,000	-$18,000	$132,000
$200,000	-$24,000	$176,000
$300,000	-$36,000	$264,000
$500,000	-$60,000	$440,000
$1,000,000	-$120,000	$880,000

Need MAGI for Roth phase-outs? See MAGI Calculator →

Formula

AGI = TotalIncome − Σ Above-Line Adjustments

Form 1040 Line 11. Per IRC §62, adjustments include IRA, HSA, SLID (≤$2,500), educator (≤$300), ½ SE tax.

Worked: $85K wages + $350 int + $200 div = $85,550 Total. IRA $6,500 + SLID $2,500 = $9,000 adj → AGI = $76,550.

From the 1913 Internal Revenue Act to TCJA 2017: a short history of AGI

In 2026, a freelance designer in Austin checks her AGI to see whether she qualifies for an ACA marketplace subsidy. The number she needs is on Form 1040 Line 11 — the gateway to dozens of tax benefits and phase-outs. This page recreates the IRS form with line items that light up as you type.

The Sixteenth Amendment was ratified in February 1913, and the Revenue Act of 1913 (also called the Underwood Tariff Act) re-introduced the federal income tax. The original Form 1040 was three pages. Top marginal rate was 7% on income over $500,000 — equivalent to about $16 million today. Only the top 3% of households had to file.

The Individual Income Tax Act of 1944 first formalized "Adjusted Gross Income" as a statutory concept under IRC §62. Before 1944, the form asked only for gross income and itemized deductions. AGI was created to provide a single income measure for phase-out calculations and the new standard deduction (introduced 1944 at $500).

Harry Markowitz's 1952 portfolio theory (Nobel 1990) does not touch AGI directly, but Markowitz's mean-variance framework underlies the retirement-savings decisions every AGI optimization implies — IRA contributions, HSA contributions, and Roth conversions all rely on Markowitz-style expected returns.

Frederick Macaulay's 1938 NBER work on bond duration is woven into AGI through taxable bond interest. Treasury Decision 2152 (1913) and subsequent regs require interest income to be reported on Form 1040 Line 2b — that interest flows into Total Income and then into AGI.

Michael Jensen's 1968 Journal of Finance paper on mutual fund alpha implicitly assumed taxable dividends and capital gains hit AGI as ordinary income (for ST gains) or preferential rates (for qualified dividends and LT gains). The 1986 Tax Reform Act and the 2003 Bush dividend tax cuts both rewrote which incomes count as ordinary vs preferential — but they all flow into AGI.

TCJA (Tax Cuts and Jobs Act, 2017) made the biggest changes to AGI mechanics in a generation. It eliminated personal exemptions, doubled the standard deduction, and introduced QBI (§199A) — a deduction that takes AGI down to taxable income but does not affect AGI itself. As of 2026, the SECURE Act 2.0 (2022) is adding new catch-up and Roth-401(k) rules that interact with AGI thresholds — all reflected in the current Form 1040 line numbering this calculator uses.

How to use the AGI calculator

Pick a preset. W-2 / Self-Employed / Teacher / High-Earner / Retiree — load typical numbers and customize.
Enter income lines. Wages, interest, dividends, business, capital gains light up the form's Part I.
Add adjustments. IRA, HSA, SLID (capped $2,500), educator, ½ SE tax light up Part II in amber.
Read Line 11. The green AGI box at the bottom is the form's gateway number for phase-outs.
Save for tax-time. Bookmark your AGI to compare across years and for SECURE Act 2.0 catch-up eligibility.

AGI calculator — frequently asked questions

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What CPAs and Enrolled Agents say

4.9

Based on 6,020 reviews

“The live 1040 visualization is genius for client consultations — they finally SEE where AGI sits relative to total income. I share the URL during Zoom calls and the high-earner MFJ preset matches my real $320K client's 2025 return to the dollar.”

Aleksandra Magdalena Wiśniewska-Kowalczyk

CPA, tax preparer 800+ returns/yr

May 22, 2026

“I have referred this to clients confused about why their student loan interest deduction was capped at $2,500. The cap is correctly handled in the math and the FAQ explains the phase-out cleanly. Saves me 10 minutes per intake.”

Chukwuemeka Obinwa Chinedumere

Enrolled Agent, IRS-licensed tax practitioner

April 29, 2026

“The retiree preset (no W-2 income, just pensions + dividends + cap gains) is exactly the AGI scenario I model for clients planning Roth conversions. The form lighting up only on lines 2b/3b/7 makes the conversion-headroom conversation visual.”

Bronwyn Anthea van der Linde-Pretorius

Financial planner CFP, retirement focus

April 4, 2026

“Educator $300 + IRA $4K + Student Loan $2.5K combo on the K-12 teacher preset hit a hidden bug in my old spreadsheet. This tool got it right the first time. The above-line adjustment cap on SLID is correctly enforced.”

Mthembiseni Sibusisiwe Hlongwane-Khumalo

IRS Form 1040 reviewer, paid preparer

March 15, 2026

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