Payment Terms
How to automatically calculate Invoice Due Date from Payment Terms
Go to Setup > Preferences > Payment Terms.
Click the Setup Payment Terms link towards the top of the page.
Select an existing Payment Term from the list or click the + New Payment Terms button at the top to add a new record.
Set the Payment Due dropdown to Days After EOM or Days After Invoice Date.
Enter the Balance Due Days.
For most businesses, setting up a global default term for cash customers, and then setting up specific payment terms for account customers is the best practice.