 Welcome to Unit 4 of PRDV204, Payroll Applications. By now you should have a good grasp of how payroll works. This will help you as we go into more complicated concepts later in the course. In this unit, we'll take a closer look at payroll and paycheck withholdings, with a specific focus on the federal taxes. We'll also talk about the Tax Withholdings Form, or W4. These are used to identify what percentage or amount is to be withheld. It is very important for the employer and the employee to understand just how much should be withheld within the payroll process. With this in mind, you will be introduced to IRS Publication 15, provided by the Internal Revenue Service. This document will provide you with a broad understanding of payroll concepts from a federal perspective. As you are reading through Publication 15, it is important that you take notes. Good luck, and I will see you at the beginning of Unit 5.