W-4, W-2, W-9, and 1099 are all tax forms, but they serve very different purposes. Let's compare. W-4 vs W-2 vs W-9 vs 1099 Summary A W-4 form (officially known as “Form W-4”) is what a full-time employee fills out for their employer when they start a new job. This form tells the employer how many deductions […]