You can customize your invoice template to add or show the past due amount, @YES Storage.
You can do it from the Custom Form Style page. Let me show you how:
- Go to the Gear icon and select Custom Form Styles.
- Click the Edit button of the invoice template that you’re using for your invoices.
- Select the Content tab, then click the Account Summary (middle) portion of the invoice.
- Make sure to add the boxes for Quantity, Rate and Amount.
- Click Done to save the changes.
Check this article for more information: Customize invoices, estimates, and sales receipts in QuickBooks Online.
For additional reference, here's a guide on how to import custom form styles for invoices or estimates.
Let me know if there's anything that I can help. I'm always here to assist.