Once you have a federal employer identification number (EIN), employee tax documents and a business bank account, with ADP, you can process payroll right away. Simply log in into your ADP account online and begin setting up your payroll information. To run payroll, start by reviewing all of your employee hours. You can then make any necessary adjustments to account for overtime, add any bonuses earned or add contractor payments, as well. View the demo for RUN Powered by ADP to see how fast and simple payroll can be.