Hello there, @Asya,
You have the option to record the payment manually in QuickBooks Self-Employed. Make sure the date falls on the reporting period to ensure the accurate amount reflects the Income.
To do that, go to the Transactions tab and enter the details of the payment. Make sure the Category selected is Income and the Date is correct. See this:

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Let me know if there's anything else I can help you with QBSE. I'm here to provide further help whenever you need anything. Have a nice day!