The Payroll Year End Update clears the prior year YTD earnings figures, preparing the way for the payroll cycles in the new year.
If doing year-end processing, see Tax Table Maintenance.
Proceed only when there's no further need for payroll checks dated in the prior year.
Once the Year End Update is performed, and a payroll cycle in the new year is updated, it is not advisable to attempt to process a prior year's payroll check. Special procedures would have to be taken to do so (like first voiding all the payroll checks in the new year) and is not recommended.