Invoicing guides
Short pieces on the parts of invoicing that are actually confusing — written once, kept honest, and free of the advice that exists only to sell you a subscription.
- How to write an invoice — every field a valid invoice carries, what each one is for, and the four that get left off.
- Invoice numbering — numbers by date, sequential series, prefixes, gaps an auditor will ask about, and how to fix a mess.
- Payment terms — what Net 30, EOM and 2/10 net 30 mean, and which terms actually get paid.
- Overdue invoices — what the word means, whose calendar decides, and what to do on the day it happens.
- Invoice or bill? — the same document read from either end, and why it is worth recording both.
- How to pay an invoice — what to check before you send money, method by method, including the scam that works.
- Getting paid in crypto — agreeing it, invoicing it, confirming it, and what to do afterwards.
- USDC vs USDT — which one to ask your client for, and why the chain matters more than the coin.
Want to see all this on a real document? The free invoice generator needs no account: type onto the sheet and download the PDF.
More will land here. If there is something you keep having to look up, the fastest way to get it written is to say so — the address is on perly.io.
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