How can I send a reminder for a overdue invoice?

Hi andrew.morrison1,

I'd be glad to share with you the steps on how you can send a reminder for overdue invoices in QuickBooks Online.

1. Go to Get paid & pay and select Invoices (or select Sales and then Invoices).
2. Find the invoice you'd like to send a reminder for.
3. From the Receive payment dropdown, select Send reminder. (Note: If you would like to send invoice reminder in batch, tick on the overdue invoices and then on Batch actions dropdown menu, select Send reminder.)
4. Customise your message and select Send.

Also, QuickBooks Online has an option where you can set up automatic invoice reminders. Here's how: 
 

1. Go to Gear icon ⚙ and select Account and settings.
2. Select the Sales tab.
3. In the Reminders section, select Edit ✎.
4. Turn on Automatic invoice reminders.
5. Select the dropdown for Reminder 1, and turn on the toggle switch.
6. From the dropdown fields, select days, and before or after to tell QuickBooks when to send the reminder. Note: You can schedule and send email reminders up to 90 days before or after the invoice due date.
7. You can create second and third reminders as needed.

For more detailed information, you can check this article: Send invoice reminders automatically or manually in QuickBooks Online.

Let me know if you have any other questions with sending an invoice reminder. I'll be around to help you.