Sage 50 does not allow to add holiday .
How can i add it to payroll?
Are you referring to a stat holiday? If so, you can create an Income field in Payroll. Go to Setup, Settings Payroll, Incomes and choose an unused Income line. Make sure you check off which taxes are to be calculated. Then go to Linked Accounts in the same area of Payroll and ensure you have an general ledger account for new holiday income field. Go to the Employee ledger and ensure under the Income folder your Holiday income section is ticked for use. From there you can do your payroll holiday pay.