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Invoicing guides

Short, practical answers to common invoicing questions.

• How to write an invoice — A plain-English checklist for writing an invoice: what every invoice should include, payment terms like Net 30, numbering, and sending it as a PDF.
• Invoice vs. receipt: what's the difference? — An invoice asks for payment; a receipt confirms payment was made. A short comparison of what each contains and when to send it.
• Estimate vs. quote vs. invoice — Estimates and quotes tell a client what work will cost before it starts; an invoice requests payment afterwards. When to use each.
• How to number your invoices — Practical invoice numbering: keep numbers unique and sequential, use a prefix or the year, and never reuse a number.