W-2 vs W-4: what’s the difference?

Few payroll terms get mixed up more than the W-4 and the W-2 — they both start with “W,” both involve taxes, and both pass between employer and employee. But they do opposite jobs at opposite ends of the year. Once you see the split, you’ll never confuse them again.

The W-4 — an input, at the start

The W-4 is a form the employee fills out, usually when they’re hired (and again whenever their situation changes). It tells the employer how much federal income tax to withhold from each paycheck — filing status, dependents, extra withholding. It’s an instruction: “withhold this much for me.” It flows from the employee to the employer, at the beginning of the relationship.

The W-2 — a statement, at the end

The W-2 is a form the employer issues to the employee after year-end. It reports what actually happened — total wages paid and every tax withheld over the year — and the employee uses it to file their tax return. It’s a record, not an instruction. It flows from the employer to the employee (and to the government), at the end of the year.

The one-glance comparison

• Who creates it: W-4 → the employee. W-2 → the employer.
• When: W-4 → at hire. W-2 → after year-end.
• What it does: W-4 → sets withholding going forward. W-2 → reports what was withheld looking back.
• Input or output: W-4 is the input; W-2 is the output.