How to Write an Invoice in South Africa (What SARS Actually Requires)

Most small businesses in South Africa lose money not because the work was bad, but because the invoice was. It went out late, it was missing a reference the client's accounts department needed, or it said "Tax Invoice" when the business was not registered for VAT — which is a problem SARS takes seriously.

An invoice is a legal document. Getting the fields right is the difference between being paid in 30 days and chasing someone for three months.

Invoice or tax invoice? They are not the same

This is the distinction that trips up most new businesses.

• If you are not registered for VAT, you issue an invoice. You may not charge VAT, and you must not head the document "Tax Invoice".
• If you are registered for VAT, you issue a tax invoice, you charge VAT at 15%, and the document must carry specific fields set out in the VAT Act.

VAT registration is compulsory once your taxable turnover exceeds R1 million in any consecutive 12-month period. You may register voluntarily above R50,000. Below that, you invoice without VAT — which is perfectly normal and not a sign of a small operation.

Calling a document a tax invoice when you are not registered, or charging VAT you are not entitled to collect, is a serious matter. If you are not registered, simply leave VAT off entirely.

What every invoice should contain

Whether or not VAT applies:

• The word "Invoice" clearly at the top
• Your business name, trading name, address and contact details
• Your registration number if you are a registered company
• A unique invoice number, sequential and never reused
• The date of issue
• The client's name and address, and their reference or purchase order number if they gave you one
• A description of the goods or services, specific enough that someone who was not in the meeting understands what was supplied
• Quantity, unit price and line totals
• The total due
• Payment terms — the due date, expressed as a date rather than "30 days"
• Your banking details — account name, bank, account number, branch code
• A reference you want the client to use when paying

The extra fields a tax invoice needs

If you are VAT registered, a full tax invoice must also carry:

• The words "Tax Invoice", "VAT Invoice" or "Invoice"
• Your VAT registration number
• The customer's name, address and VAT number where they are registered
• The value of the supply, the VAT amount, and the total — either shown separately, or as a VAT-inclusive total with a statement that it includes VAT at 15%

For supplies of R5,000 or less an abridged tax invoice is acceptable, which does not require the recipient's details. For very small amounts, under R50, a tax invoice is not required at all, though you still need proof of the transaction.

Your client cannot claim an input VAT deduction without a valid tax invoice. If you leave a required field off, their accounts department will send it back, and your payment moves to the next payment run.

Why invoices get paid late

In practice, most late payments trace back to something avoidable:

• No purchase order number on an invoice for a client who requires one. It will sit unmatched.
• A vague description. "Consulting — July" invites questions. "Website redesign: 4 pages, final delivery 18 July" does not.
• Terms written as "30 days" rather than an actual date. Thirty days from when, exactly?
• Bank details buried at the bottom in small type, or missing entirely.
• Sent to the wrong person. The person who hired you is often not the person who pays you. Ask who invoices go to before you send the first one.
• No follow-up. A polite reminder three days before the due date resolves more late payments than anything you can write into the terms.

When you can charge interest

If your payment terms say so, you may charge interest on overdue amounts. Under the Prescribed Rate of Interest Act, interest runs at the prescribed rate where no other rate is agreed. Your invoice or underlying agreement should state the rate and when it starts running.

In practice, most small businesses use this as leverage rather than revenue — an invoice noting that interest applies after 30 days tends to be paid faster than one that says nothing.

Also worth knowing: a debt generally prescribes after three years in South Africa. If you never chase an invoice and never get an acknowledgement of the debt, you can eventually lose the right to claim it.

Doing it properly without a bookkeeper

For a business issuing a handful of invoices a month, full accounting software is usually more than you need — and templates in Word tend to drift, with old dates and duplicate numbers creeping in.

FormCraft AI handles invoices as a guided form: your business details are saved once, you fill in the client and the line items, and it assembles the document with the right fields in the right places. It handles quotes and receipts the same way, applies your letterhead and logo, and exports a PDF you can send straight to WhatsApp or email.

The first document each month is free. After that it is R99 a month for businesses, or R50 once off for a single document.

Frequently asked questions

Do I need to be registered as a company to invoice?

No. A sole proprietor can invoice under their own name. You need a bank account and a clear record of what you supplied. Registering a company matters for liability and for clients who require it, not for the right to invoice.

How long must I keep invoices?

Generally five years from the date of the last entry, and SARS can ask for them within that period. Keep digital copies backed up somewhere other than the phone that issued them.

Can I invoice in a foreign currency?

Yes, though for VAT purposes the amounts must be reflected in rand at the applicable exchange rate. If you are billing internationally regularly, get an accountant to set the pattern up once.

What is the difference between a quote and an invoice?

A quote is an offer, valid for a stated period and not yet a debt. An invoice is a demand for payment for work already supplied or agreed. Sending a quote when you mean an invoice is one reason payments stall.

Do I need a signature on an invoice?

No. An invoice does not require a signature to be valid. Signatures matter on contracts and delivery notes, where you are proving agreement or receipt.

Conclusion

A good invoice is boring: correct number, clear description, real due date, right person, banking details easy to find. Boring invoices get paid.

The two mistakes that actually cost money are calling something a tax invoice when you are not VAT registered, and leaving off a field your client's finance team requires. Both are easy to avoid once your template is set up correctly.

This article is general information, not tax or legal advice. Speak to a registered accountant about your VAT position.

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