| Type of Document | Information statement summarizing annual earnings and taxes withheld. | Actual federal income tax return form. |
| Who Issues It | Employer to employee and the IRS. | Taxpayer to the IRS. |
| Purpose | To report an employee's annual wages and the amount of taxes withheld from their pay. | To calculate and report a taxpayer's annual income tax liability. |
| Who Uses It (Eligibility) | All employees who receive wages, salary, or other compensation from an employer. | Historically, single or married filing jointly individuals with simple tax situations (no dependents, limited income sources, etc.). |
| Income Types Covered | Wages, salaries, tips, and other compensation from employment. | Primarily wage income (from W-2) and limited taxable interest. |
| Deductions/Credits | Does not directly show deductions or credits, but provides data needed for them. | No itemized deductions or most credits could be claimed, simplifying the form. |
| Complexity | A data source; relatively straightforward to read for reported income and withholdings. | Designed to be the least complex tax return form, often just a few lines. |
| Key Information Provided | Gross wages, federal income tax withheld, Social Security wages/tax, Medicare wages/tax, state wages/tax. | Adjusted Gross Income (AGI), taxable income, total tax, payments, refund or amount owed. |