Good day, outwood. I can share details on why cash sales aren’t showing or added to your income in QuickBooks Online (QBO).
The way transactions are posted depends on how they were recorded in the system and which account was used. If you record your sales based on the actual payments you received, then they will not appear on your Profit and Loss (P&L) statement and won't use income accounts. This explains why your cash sales transactions don't add up to your income.
Moreover, the types of transactions that you can use that record your income are Sales Receipts, Bank Deposits, and Invoices if transactions are paid at a later part.
Furthermore, you have the option to use different financial reports to gain a quick overview of your business's financial progress. Additionally, I have included a resource that provides detailed instructions on how to customize these reports to your needs: