Thanks for joining this thread, JMG6.

In QuickBooks Desktop (QBDT), when the invoice you send is uncollectible you have to record it as bad debt to write them off. This process ensures that your accounts receivable and net income stay up to date. To know more information about this, feel free to visit this article: Write off bad debt in QuickBooks Desktop. 

Also, in QBDT, monitoring your business income and accounts receivable is a breeze. The program has ready-made customer reports you can open at any time and customize depending on your business needs. 

Don't hesitate to post again here if you have any other QuickBooks concerns. I'm always around to assist you. Take care.