Can I have interest added to an over due invoice automatically?

Hi there, 

If your customer hasn't paid you on time for their outstanding invoice, it's reasonable that you'd like to add interest charges. I'll help you achieve that. 

Here's a link to another question posted in the Community. This customer had the same question, and the answer provided by a member of the QuickBooks Team was detailed and helpful. Take a look at it here: https://quickbooks.intuit.com/community/Sales-and-invoicing/How-do-I-charge-interest-charges-to-overdue-invoices/m-p/261173. 

Once you read through that, let me know if you have any outstanding questions. I'll be here to help. 

Cheers.