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:
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.