You are able to specify payment terms in Settings->General, as below:
By setting your payments terms the new “Due Date” field on the Invoice screen (shown below) will automatically be populated with the invoice date + payment terms. So, for example if you set payment terms to 30 days and you raise an invoice on 26/06/2017 the due date will be displayed as 26/07/2017. If you wish to over-ride the due date on the invoice screen you can just amend it.
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