An invoice is not paperwork — it's the legal instrument that turns your work into money. Get it right and you get paid on time; get it wrong and you've handed a slow payer their excuse. Here's the complete anatomy, step by step.
Top of the document: your trading name, physical or registered address, email and phone, and your registration number and tax ID where your jurisdiction requires it. A client's accounts department will bounce an invoice missing legal identifiers — not out of malice, out of policy.
Invoice the legal entity, not the human. "Loop Farms (Pty) Ltd, attention: Sarah Mokoena" beats "Sarah". If the client is VAT-registered and will claim the input tax, their VAT number belongs here too.
Each deliverable gets its own line: description, quantity, unit price, line total. "Website design — R18,000" invites a negotiation; "Homepage design and build (R9,000) · 4 inner pages (R6,000) · Contact form and hosting setup (R3,000)" reads like a record of agreed work.
Show the subtotal, then your tax as its own labelled line — US state sales tax, UK VAT at 20%, GST, whatever applies to you — then the total. If you're below your jurisdiction's registration threshold, show no tax rather than a made-up rate. This is where DIY invoices most often go wrong, and where a proper tool earns its keep by doing the arithmetic every time.
The amount due in your invoicing currency, bold and unmissable. Then remove every barrier to paying you: bank name, account number, branch code, reference to use ("please use INV-2026-014"). Add your late-payment position ("2% per month on overdue balances") — you'll rarely enforce it, but its presence changes behaviour.
PDF by email, same day as agreed. Record when it went out. Diarise a polite nudge for two days before due date — "just confirming everything's in order for Friday's payment" collects more money than any late-fee clause ever written.
Everything above is what Incredibiz does automatically: your business details are saved once, customers autocomplete, numbering is sequential by default, your own tax rate is applied per line, and the PDF is generated and tracked. In our stopwatch test, a repeat invoice takes 40 seconds. The free plan covers 5 invoices a month with no card — enough to run a lean month — and top-up packs from R29 (or Pro for unlimited) when business picks up.
| Mistake | What it costs you |
|---|---|
| No due date | "We pay all invoices at month-end" — their month-end |
| Missing tax number | Bounced by accounts, resubmitted, paid a cycle later |
| Vague line items | Scope disputes after the work is done |
| Wrong or absent banking details | The most expensive typo in business |
| No invoice number | "We never received it" becomes unfalsifiable |