A W-2 Form is a tax document that employers in the United States must provide to their employees at the end of each year. It reports the employee's annual wages and the amount of taxes withheld from their paycheck. This form is essential for employees when filing their income tax returns. Employees use the information on the W-2 Form to determine their tax liability and to ensure they have paid the correct amount of taxes throughout the year. The form includes details such as the employee's Social Security number, employer identification number, and various tax withholdings.