QBO has rolled out a beta test on automatic late fees, cwermers.

At this time, not all QBO accounts have the option to activate the Automatic Late Fees feature. Rest assured our developers will expand this option to more customers in the coming months.

You can follow these steps to turn this on:

1. Log in to QBO as the Master or Company Admin.
2. Click the Gear icon.
3. Select Account and Settings.
4. Click the Sales tab on the left panel.
5. Click the pencil icon in the Late Fees section.
6. Check the box to turn it on.
7. Enter the Type, Amount, Frequency, and Grace Period.
8. Click Save, and then Done.

You can also refer to this article to learn more about applying automatic late fees in QuickBooks Online.

Please get back to me if you need anything else.