So, to help save time and cut down on hassle, have a look at our 100% customizable Sales Invoice Templates! Quickly set up a professional base to work off of with our easily editable content for Microsoft Word printable in both A4 and US letter sizes. Not only are they convenient in usage, but they’re even easy for anyone to read and comprehend. By utilizing invoices, you’ll have logs that outline purchase details in a concise format. Are you a business that provides goods and services to consumers? If so, then it’s important to make use of invoices when it comes to recording transactions and billing clients/customers for those transactions.