Hi Karen,
Removing the employee’s leave date and setting their tax code to 0T week 1/month 1 is correct. However, it appears as if you’re trying to pay the employee in the same tax month as you’ve already paid him.
As the first day of the tax year is 6 April, tax months run from 6th of the month to the 5th of the next month. Therefore, tax month 3 runs from 6 June until 5 July, meaning 1 July is in the same tax month as your June pay day.
To resolve this you should set your Process Date in Sage 50 Payroll to your July process date to pay the extra wages to this employee.
You can view and print the 2016/2017 tax year here.
You can refer to Ask Sage article 18788 for full details on how to process extra pay for a leaver after issuing their P45.
*Community Hub is the new name for Sage City