If taxes were already paid, make sure to record them in QuickBooks to ensure your payroll records are in order. To visually guide you through the process, check out this article and proceed to the Enter historical tax payments outside the payroll setup window section.
There you go. Your payroll information should now be complete.
If you need further assistance with any of the steps, post a comment below. I'll be around to help. Wishing you the best.