QB Issue Resolution:

Could be other components, a sales receipt usually posts income too

if you create a deposit manually and use an income account as the source account for the deposit

a journal entry using an income account in it

Resolution for Issue 'Does income equal invoices sent for a period on a PL statement?' available: Yes (Solved).
Source: Intuit Community forum.

Does income equal invoices sent for a period on a PL statement?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for a sales receipt
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Error Recovery for a sales receipt [Canada]
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