If I have a check box ticked yes I would like my database to perform a calculation - can someone please let me know how to set this up.
I'm doing an invoice and I have a checkbox yes/no for if tax is to be added.
If check box is ticked yes I need the total field to add 10% tax to my invoice total.
If my checkbox is ticked no then no tax is to be added to my invoice total.
Thank you for your help.