I appreciate the detailed information you've shared, @gnocchi. Allow me to help you figure out why the income account is missing from your Profit and Loss report.

There are several possible reasons why you're not seeing your sales income in the Profit and Loss report. Here are the following:

• The transactions aren't added to QuickBooks
• Sales were not categorized into their corresponding income accounts
   

With this, make sure to add the transactions in QuickBooks. If it's already added, you can review the associated account to see if you've used the correct income accounts. To do this, you can run the Transaction Detail by Account report and add the Account and Account Type column. I'll show you how.
 

1. Go to the Reports menu and select Report Center.
2. Search and Run the Transaction detail by Account report.
3. Click Customize Report.
4. From the Display tab, locate and put a checkmark on the Account and Account Type in the Columns section.
5. Then hit OK to save changes.
    

You can also check the accounting basis set for the Profit and Loss report. The Cash and Accrual basis basis reporting differ in how income or expenses are determined for reporting. When generating the report, ensure the accounting method is set correctly.

Furthermore, I'm attaching these links for future reference in modifying your reports: Customize reports in QuickBooks Desktop.

You can always post your questions about tracking your income transactions in QBDT. Have a good one.