Blacklist option or notes for problem customers??

Thanks for getting in touch with the Community, rufunky.

I can certainly understand how an ability to blacklist customers/receive alerts about their blacklisting could be useful and have submitted a suggestion about it as of today.

You can also submit your own feature requests while using QuickBooks.

Here's how:

1. In the top menu bar, go to Help, Send Feedback Online, then Product Suggestion....
   
2. Choose a Type of Feedback and Product Area (optional) from your available drop-down menus.
   
3. Enter any suggestions/feedback in the Here is my suggestion: field.
   
4. If you'd like, include your name/email in the My name is: (optional) and My e-mail address is: (optional) fields.
   
5. Select Send Feedback.
   

Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's Product Updates webpage.

As a workaround, you can add notes to customer profiles:

1. In your top menu bar, go to Customers, then Customer Center.
2. Find a customer profile you want to edit and double-click it.
3. Access the Notes tab.
4. Add any necessary notation(s).

Another option is to make customers inactive. You can do so by right-clicking their profile on your customer list, then selecting Make Inactive.

You can also check our QuickBooks App Store for apps which may be able to help you achieve what you're looking to do.

If there's any additional questions, I'm just a post away. Have an awesome day!

@rufunky 

Navigate to the Payment Setting on your customer file and set the Credit Limit as 0.

Then navigate to Additional Info, you can create some new Customer Types (e.g Blacklisted, Watchlist)