Improve your cash flow. One study by the National Federation of Independent Business indicated that small business receivables have grown to 48 days over the last five years. Switching to an electronic invoicing service eases the administrative costs associated with issuing and mailing paper invoices, streamlines invoice follow up for late or past-due payments (especially when you establish automated delivery tracking) and potentially expedites the speed with which you’re likely to be paid, especially when you offer the ability to pay online with a credit card.