The word bill comes from the Medieval Latin word bulla, meaning sealed document. That became the Anglo-Norman French word bille , which morphed into the English word bill. 

Your vendor sends you a bill that you will then pay. If you print the bill and mail it, your customer will receive a sealed document. Even if you email it, there is a sense of the bill being a sealed document as long as that mail account is protected.

An invoice is sent, while a bill is received. When you send an invoice to a customer, the customer then receives it as a bill- it’s all about the perspective. 

Invoice and bill are a great example of the importance of words and communication. They are actually describing pretty much the same thing! So, why use two different words?

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