Abonus run lets you record a second payment within the same pay period, for example, if Revenue tells you to record redundancy payment under a different PRSI code.
Keep in mind:
Always complete your normal pay run first, so tax credits and cut-offs calculate correctly
Sage 50 Payroll Ireland doesn’t deduct pension contributions for the employee or employer in a bonus run because those deductions happen in the main pay run
Tax and Universal Social Charge (USC) recalculate across both runs
Gross pay and PRSI from the normal run carry into the PRSI calculations for the bonus run
Set a bonus run period
Check the payroll status at the bottom of Sage 50 Payroll Ireland is End of Period (EOP). If it isn't, revert back to an archived period and correct it first.
Select Processing, then Set Period. CAUTION:Don’t change the period number. This needs to be the same as the normal pay run.
Select the Bonus Run check box.
NOTE: When you set a bonus run period, the Ins. Weeks value reduces to zero. This is correct , don't amend it.
Select OK.
Process employees pay in the bonus run
Go to Processing, then Time and Pay.
Under Entry Mode, select Random, then Continue.
Next to Employee, select Browse, then choose the employee.
Select the next available pay element or deduction line.
Press F2 on your keyboard, then double-click the payment or deduction. Repeat this for each item to include.
Enter the employee's pay details:
Hourly payments: Enter hours in Hrs/Val and rate in Rate
Fixed or variable payments: Enter the value in Hrs/Val
Deductions:
Enter the employee’s deduction in E’e Value
If needed, add the company’s contribution in E’r Contrib
Enter 1 in the Deductions field under Pay Periods if required
Select Save.
Repeat steps 3 to 6 for each employee, then select Cancel.
Close the bonus run
When you’re ready to close the bonus period, follow the same steps you’d normally use in process your payroll.
CAUTION: 
NOTE: When you set a bonus run period, the Ins. Weeks value reduces to zero. This is correct , don't amend it.