At this time auto-reminders for overdue invoices is not yet a feature of QuickBooks Online. We do have an option to filter by overdue invoices and batch send reminders if required.
Go to the Sales tab, then All Sales
Select Filter, change Transaction type to 'Invoice' and Status to 'Overdue', then Apply
Select the relevant invoices, then Batch actions and 'Send Reminders'
I would be happy to pass this on to our product team to be considered in a future update. I would also strongly encourage you to submit this in-product as well as we welcome all feedback from our customers. Simply go to the Settings cog and select Feedback to do so.
-Kass
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