Invoices vs Revenues
There are two types of incomes within Akaunting: Invoices and Revenues. They are totally different entries and there is no link between.
Invoice is a planned and itemized income, Revenue is an instant and simple income.
Invoice is a document sent to your customer that indicates the items sold by you. It is generally not paid yet. You should use invoices if you work with tax.
Revenue is a non-invoicable and paid income. There are no items within the revenues. Tax is not applicable.