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 (CIPC) and VAT number if you're VAT-registered — SARS requires the words "Tax Invoice" and your VAT number for any invoice over R5,000 where VAT is claimed. 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.
In South Africa: if you're VAT-registered, show the subtotal excluding VAT, the VAT at 15% as its own line, and the total including VAT. If you're not registered, don't show VAT at all — charging VAT you can't remit is fraud, not a rounding error. 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 Rand, 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, VAT at 15% 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 |