Hi co19.
Using the QuickBooks Payroll add on is a great way to get your employees paid on time, create payroll forms and track your payroll information. I'd be happy to help go over if you can continue using payroll while having 2021.
You can continue to use QuickBooks Desktop 2021 with payroll until the 2022 July tax table update. After that you'd need to upgrade to 2022 to get the tax table update to ensure your payroll is correct.
If you have any questions let us know and we'd be happy to help.