Also see, Set default Quote expiry & Invoice due dates for Customers
Step 1: Navigate to Admin & Settings
Step 2: Set your Invoice Default Due Date and select Save
Note: You can use your accounting providers default or add a number and select;
- 'of the following month'
- 'day(s) after the invoice date'
- 'days after the end of the invoice month'
- 'of the current month'
To see the Due Date within your Invoice select the Invoice header to bring out Invoice Details. As you can see below, the Due Date has been set by default.