From the Sage Payroll Dashboard:

1. Click on Payroll
2. Click on Previous Tax Year
3. Select the tax year you want to access
4. Click on Payroll
5. Click on Payslip
   
6. Select the applicable employee and the applicable definition.
7. In order to adjust an existing value, click on the specific definition on the payslip. This will open a view where you can edit and add values to the selected line.
8. In order to adjust an amount, click on the  in the header line. You may then enter an amount and select to which period the change must be applied.
9. Only one adjustment amount will be allowed per payroll month

Please note that the adjustment will reflect in the month of February as it is the last period of the tax year.