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Invoicing Guides
Short, practical guides to the business side of freelancing — writing invoices, setting payment terms, numbering, and collecting what's owed.
Start with the free generator
Every template below opens in Billia's free invoice generator — no signup, no watermark.
Create my invoice — freeFrequently asked questions
What will I learn in these invoicing guides?
How to write, send, and number invoices, how to set payment terms, how estimates differ from invoices, and how to get paid faster — including what to do when payments go late.
Are these guides free?
Yes — every guide is free to read, no signup and no paywall. They're designed to pair with Billia's free tools.
I'm sending my first invoice ever — where do I start?
Read 'How to Write an Invoice' first, then 'What to Include on an Invoice' as a checklist. Then open the free invoice generator and build it in minutes.
Do the guides cover my specific trade?
The invoicing principles apply to every trade. For trade-specific documents, browse the 30 profession invoice templates — from plumbing and electrical to catering and car detailing.