Report - sales invoice total by customer

I noticed this report did not capture all invoices paid for in that year. Two invoice that were made in the end of the previous year (December) but paid for in January (recorded as such in transactions) were not captured.

I’ve doubled checked and the invoices were definitely record as paid in the reported year. I think the report is capturing the invoice creation date rather than the paid date.

That is correct and as designed. The report is a list of sales invoices issued during a period, regardless of payment status. It is not a list of receipts. It records sales activity, not income.