How to create new invoice without a due date?

[siliconboy187]

We offer website design services as well as web hosting. Is there a way to be able to create an invoice without a due date? This would be for our web design services. We bill 50% upfront, and the remaining 50% when the design is completed. We would like to go ahead and create the final invoice after the initial payment is made, but since we wont know the due date, we would like to create the invoice without a due date.

 

Is this possible?

[bear]

I typically set the due date a year in the future and adjust it back once the design is complete.