Manual accounts payable invoice processing for most organizations is inefficient, non-strategic, costly, and challenging. Not only is it error prone, the risks for organizations relying on paper based processes can be significant: 1  The average cost of processing an invoice is between $6-$15 for most organizations.2  The average time to process an invoice is over 16 days. 3  83% of invoices are still paper based or paper dependent.ot only is it error prone, the risks for organizations relying on paper based processes can be significant: 1  The average cost of processing an invoice is between $6-$15 for most organizations. 2  The average time to process an invoice is over 16 days. 3  83% of invoices are still paper based or paper dependent.