It's not a gap, it is laziness or lack of attention to detail. It is a day of work to add invoices. Less depending on what services you use. Yet many companies

It's not a gap, it is laziness or lack of attention to detail. It is a day of work to add invoices. Less depending on what services you use. Yet many companies don't even do that. But even so, that should be the bare minimum they do. PDF invoices have distinct advantages over email. Mainly that most companies still aren't using expense reporting and accounting systems that can process email receipts. Most people still have to upload their receipt to a website. If it comes in as email that means: - Printing as PDF - Then uploading It is an extra step that is completely unavoidable and doesn't seem like it would be an issue until it takes an hour+ to complete your expenses because a dozen web services force you to do this.