If you are an employee, there are two IRS tax forms that are particularly important to you. They are the W-4 and the W-2.
The W-4 (Employee's Withholding Allowance Certificate) is an informational IRS form that you need to fill out when you work as an employee. This is the form contains the amount of withholding allowances you claim. It also contains whether or not you want any additional amounts withheld from your paycheck. It can be updated throughout the year with your employer as your circumstance changes. However, every time you need to change information on your W-4, you need to fill out a new one. This tax form will become part of your employer's payroll department.
The W-2 (Wage and Tax Statement) is the tax form your employer prepares and sends to you by January 31, 2007. It contains information you need to fill out your Form 1040, Form 1040A, or Form 1040EZ income tax return. Information contained on your W-2 includes: