Invoicing guides
Short, practical guides for freelancers and small businesses. General information, not legal or tax advice.
Each guide answers one real question we see freelancers and small businesses ask: what has to be on an invoice, how to number them, how long to give a client to pay, and how to word a reminder without souring the relationship. We cite an official or widely used source where one exists, and we say plainly where a rule depends on your country, so check the editorial policy for how guides are written and kept current. If a guide points you to a document you then need to fill in, every one links straight to the matching tool.
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The basics
Invoice vs Receipt vs Quote vs Estimate: What Is the Difference?Four documents that look alike but do different jobs. Learn when to send a quote, an estimate, an invoice or a receipt.What to Include on an Invoice (Required vs Optional)A plain-language checklist of what an invoice usually must contain, what is optional, and why requirements differ by country.