Hello, @SJ15.
When you’re in a cash basis, the time when you enter a transaction and the time when you pay or received the cash are two separate events.
A cash-basis report shows income only if you have received it, and expenses only if you have paid them. The income for this invoice will only show once you received the payment.
To know more about this, see this article: Differentiate Cash and Accrual basis. Also, here’s more information on how to record an invoice payment.
Let me know if you still have questions, I’m always here to assist. Have a great rest of the day!