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Invoicing guides

Eight guides to invoicing, written for the person doing it rather than for a search engine: what an invoice must contain, how to write one that is not sent back, how to send it so it gets paid, and what to check before you pay one.

They are written as one set rather than eight separate articles. What an invoice is comes first, then how to write one and how to send it so it gets paid; invoice numbers and the difference between an invoice and a receipt cover the two things that most often get an invoice sent back. Proforma and commercial invoices are the documents people meet when a sale crosses a border or comes before the work. Each links to the others where it helps, so you can start anywhere.

Invoice tools, compared

Choosing a tool rather than learning the document? The comparisons cover what each invoice generator actually costs.

Where to start

You have never sent one
Begin with what an invoice is — the eight things it has to carry, and the three documents it gets confused with. Then how to write one, field by field, in the order they appear.
You are sending one today
How to send an invoice is the practical one: who to address it to, what to write in the email, and four escalating reminders to use when nothing comes back. Invoice numbers covers the field that gets invoices rejected most often.
Somebody has sent you one
How to pay an invoice is written from your side — how to check it is genuine before you pay it, what to use as the payment reference, and what to say when the amount is wrong or you cannot pay on time.
Goods are crossing a border, or money is moving first
A commercial invoice is the customs document that travels with physical goods. A proforma invoice is the one you send before the sale is agreed — it looks like a bill and is not one, and treating it as one causes real accounting trouble.