Figures: tax year 2026
Gross income starts from everything, then subtracts only what a statute removes. Most missed points on this unit come from the second half, not the first.
Gross income is all income from whatever source derived, unless an exclusion applies. The preparer therefore begins with total accessions to wealth and removes items only on statutory authority.
- Realization: an accession to wealth becomes income when an event fixes it, such as payment, sale, exchange or discharge.
- Recognition: a realized amount enters the return unless a deferral or exclusion provision keeps it out.
- Gross income: the top of Form 1040, U.S. Individual Income Tax Return, before adjustments.
- Adjusted gross income (AGI): gross income minus above-the-line adjustments, which the Adjustments and Itemized Deductions lesson owns.
- Taxable income: AGI minus the standard or itemized deduction and any qualified business income (QBI) deduction.
KEY: Cash received is not the test. You include realized accessions to wealth, and you exclude cash receipts that are borrowed, returned capital or statutorily excluded.
Common mistakes
- Wages net of withholding. Reporting $65,400 instead of the $74,300 Box 1 amount treats a tax payment as a reduction of income.
- Qualified dividends added twice. Box 1b sits inside Box 1a, so $2,700 plus $1,100 overstates dividends by $1,100.
- Gross proceeds used as gain. A $21,000 sale with $400 commission and $14,000 basis produces $6,600, not $21,000 or $7,000.
Bottom line
- Gross income captures every accession to wealth unless a statute excludes it; cash receipt alone is neither necessary nor sufficient.
- Wages are Form W-2 Box 1 before withholding, and tips, overtime and vehicle-loan interest deductions sit below gross income, never reducing it.
- Fringe exclusions are capped: $50,000 of group-term coverage, $5,250 educational assistance, $7,500 dependent care, $3,400 (2026) health flexible spending reduction, and $340 (2026) monthly parking or transit.
- Ordinary dividends in Box 1a already contain the qualified dividends in Box 1b; qualified status changes the rate, never the inclusion.
Exam shortcut
Read every dollar in a stem as included until a statute removes it, then name the statute's condition out loud before excluding anything. Three signals do most of the work. A stem naming a form box is testing whether the correct box was pulled, so check whether the draft subtracted withholding or added Box 1b to Box 1a.
The full lesson (about 7,977 words, 53 min read) adds 6 worked examples, all 7 common mistakes, a self-check, free in the app.
Learning objectives
- IV.A1
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