Invoicing guides

Short, practical answers to the questions small businesses ask most about billing.

• How to write an invoice – step by step, from the header to the payment details, with an example.
• What should an invoice include? – a checklist, plus the tax rules for 11 countries.
• Invoice vs receipt – which one to send, and when.
• Quote vs estimate – fixed price or best guess, and how each becomes an invoice.
• What is a proforma invoice? – for advance payments and international orders.
• Tips for getting paid on time – terms, deposits and a reminder routine.
• Frequently asked questions – about using BillDoodle.

Ready to start? Open the invoice generator – free, with no signup.