Hi there, USellis1.
Adding late fees and and discounts to your invoices is something you will need to manually apply for now.
Please visit our App Store to look for third-party applications that offer these type of features. You can do it directly within QuickBooks Online or through the website. Just go to the Apps menu, then click Find Apps.
On the other hand, the website can be accessed here: https://apps.intuit.com/app/apps/home.
If you haven't yet, let's send your feedback about automatically adding fees and discounts in QuickBooks Online. Just click the Gear icon and select Feedback. All feedback and product requests will be collated and will be sent to our engineers.
We're always here if you need anything else. You can either leave a reply below or start a new thread. Thanks!