You find that you have already started processing the payroll before the new tax update was released.
You may still go ahead and install the update, so long as payments were not made to employees.
When the update is installed, Tax will be recalculated based on the latest tax tables, therefore payslip figures will change.
If you have printed payslips and reports, these will need to be redone.
You may create the ACB file, and payment to employees can be made thereafter.