Gross Income
What is gross income for tax and payroll purposes?
Gross income for tax purposes is total income from all sources before any adjustments or deductions, as defined in IRC Section 61. For payroll specifically, gross income usually means the total compensation earned by an employee in a pay period before withholdings: wages, salary, overtime, bonuses, commissions, and certain taxable benefits. The figure appears in different forms on W-2 (Box 1 for federal taxable wages, Box 3 for Social Security wages), with differences explained by pre-tax deductions and taxable benefit treatment.
Gross income is one of those terms that means slightly different things depending on context. The IRS uses it broadly under IRC Section 61 to mean income from all sources. Payroll uses it more narrowly to mean total compensation in a pay period before withholdings. The W-2 reports multiple variations: Box 1 (federal taxable wages) excludes pre-tax 401k and HSA; Box 3 (Social Security wages) excludes 401k but includes pre-tax health premiums; Box 5 (Medicare wages) is closest to true gross. Understanding the differences matters for tax filing and payroll audit.
Gross Income Under the Tax Code
IRC Section 61 defines gross income broadly: "all income from whatever source derived," including wages, salaries, fees, commissions, fringe benefits, business income, dividends, interest, rent, royalties, alimony, and many other categories. Tax exclusions (employer-paid health insurance, gifts, certain fringe benefits) carve out specific items.
Gross Income in Payroll Context
Total compensation earned in the pay period: wages, salary, overtime, bonuses, commissions, taxable benefits. This is the figure before any pre-tax or post-tax deductions. It's the starting point for net pay calculation.
How Gross Income Maps to W-2 Boxes
Box 1: federal taxable wages (gross minus pre-tax 401k, HSA, FSA, qualified transit). Box 3: Social Security wages (capped at wage base, excludes 401k but includes health premiums in some cases). Box 5: Medicare wages (typically closest to actual gross). The differences explain why employees often see three different "wage" figures on their W-2.
Calculating and Communicating Gross Income
Verify gross income in payroll system against expected (base plus overtime plus bonuses). Audit W-2 Box 1, 3, 5 reconciliation annually. Help employees understand why W-2 boxes differ. See taxable income for the tax-specific calculation and payroll for processing context.
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