You are able to have your payment terms included as a default on all invoices. You can change this message as needed.
Setting defaults terms for invoices
- Navigate to the Contacts Main tab
- In the "Reports" section, click on "Invoice Reports & Settings"
- In the "Invoice Defaults Contact Email Notification Settings" section navigate to the bottom subsection
- Type in the terms you would like to be displayed
- Click on the "Save All Setting" button at the bottom of the page