Hi NikkiH
Thanks for your post.
The overdue amount is calculated based on the To Date. If you use today's date, it will show the overdue amount as of today's date. Therefore, if you click the overdue link, the bill or invoice will only show as overdue if the chosen date is after the due date.
You can also check the due date settings in Sales Settings (dropdown box under business name)>>Payments tab>>Select the due date default from there.
Let me know how you go and if you still need further assistance with this. I'm happy to assist you.
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Best Regards,
Cel