What Must Appear on an Invoice: The SARS Rules, and What to Do If You're Not VAT-Registered

An invoice looks like the least interesting document a business produces — until a customer disputes what they owe, or simply doesn't pay, and the invoice becomes the single most important piece of paper in the room. Getting the basics right from the start costs nothing and matters considerably more than most business owners realise until the day it genuinely counts.

If you're VAT-registered: SARS's rules are specific, not optional

Section 20 of the VAT Act sets three tiers, based on the value of the supply:

• Above R5,000 — a full tax invoice is required, containing: the words "Tax Invoice", "VAT Invoice" or "Invoice"; the supplier's name, address and VAT registration number; the recipient's name, address and VAT number (where the recipient is also a vendor); a serial number and the issue date; a proper description of the goods or services supplied (noting if any are second-hand); the quantity or volume supplied; and the value of the supply, the VAT amount, and the total consideration.
• R50 to R5,000 — an abridged tax invoice is permitted, with fewer required details than the full version — still needs to properly reflect the transaction, just without every field the full invoice requires.
• R50 or less — no tax invoice is required at all; a till slip or sales docket showing the VAT charged is sufficient.

SARS requires a vendor to issue the tax invoice within 21 days of the supply being made — not whenever convenient, and not only on request. This matters for your customer too: without a proper tax invoice, a VAT-registered customer cannot claim the input VAT back, which is exactly the kind of thing that generates an awkward phone call weeks later if your invoicing has been informal.

If you're not VAT-registered: SARS's rules don't bind you, but good practice still does

A business below the VAT thresholds — most genuinely new, small companies — is not subject to these specific SARS formatting rules, since there's no VAT to account for. But "SARS doesn't require it" is not the same as "it doesn't matter". A properly detailed invoice remains the clearest, simplest proof of exactly what was agreed and owed, and is precisely the document a letter of demand or Small Claims Court case relies on if a customer later doesn't pay. A genuinely good invoice, VAT-registered or not, should still include:

• Your business's full name (and registration number, if a registered company) and contact details
• The customer's name and details
• A unique invoice number and the date issued
• A clear description of what was supplied — specific enough that a court, months later, could work out exactly what was agreed from the invoice alone
• The amount owed, and the payment terms (due date, accepted payment methods, and any late-payment interest that applies)
• Your banking details, if payment is expected by EFT

None of this requires accounting software or a paid invoicing tool to get right, though both make it considerably easier to stay consistent as the business grows — the requirement is substance (a clear, complete, dated record of the transaction), not a specific piece of software.

Where invoicing discipline actually pays off

The value of getting this right rarely shows up in the moment an invoice is sent — it shows up later, in three specific situations:

• A dispute over what was agreed. A vague invoice ("consulting services — R15,000") is far weaker evidence than one that specifically describes the scope, period, and deliverable, if a customer later claims the amount or the work was never properly agreed.
• Chasing a non-paying customer. As covered in this series' guide to unpaid invoices, your letter of demand and any Small Claims Court case rests directly on the invoice as proof of the debt — a properly detailed one is simply a stronger case.
• Your own tax position. Consistent, complete invoicing makes your own provisional tax estimates and annual return considerably easier to get right, since your actual income is properly documented as it happens rather than reconstructed from memory and bank statements at year end.

A word on electronic invoices

SARS explicitly accepts electronic tax invoices containing all the required fields — a PDF invoice emailed to a customer carries the same legal standing as a printed one, provided it contains everything the paper version would need. There is no requirement to physically print and post invoices to be compliant; the substance of what's on the document is what matters, not the medium it's delivered in.

Record-keeping: don't just send it, keep it

Invoices — issued and received — generally need to be retained for at least five years, alongside the rest of your business's financial records. This matters for VAT input claims if you're registered, for supporting your income tax and provisional tax filings regardless of VAT status, and simply for having your own records available if a dispute or a SARS query arises well after the transaction itself is a distant memory.

Sources: SARS's published tax invoice requirements under section 20 of the VAT Act 89 of 1991 (the R5,000 full/abridged threshold, the R50 no-invoice threshold, required fields for a full tax invoice, the 21-day issuance window, and SARS's acceptance of electronic invoices). This is general information, not tax or legal advice — a business with complex invoicing needs (foreign currency transactions, second-hand goods, or industry-specific rules) should confirm the specific requirements that apply with an accountant.

A worked example

A freelance bookkeeper, not yet VAT-registered, invoices a small retail client R4,500 for a month of bookkeeping work with only "bookkeeping — R4,500" on a plain email. Three months later, the client disputes the amount, claiming they only agreed to R3,000 for basic reconciliation, not the fuller service actually delivered. With no scope, date range, or description on the original invoice beyond a single line, the bookkeeper has little to point to beyond their own recollection of what was agreed. Compare this to an invoice that instead states "Monthly bookkeeping services, : bank reconciliation, accounts payable/receivable processing, and monthly management report — as per scope agreed " — the same amount, but a document that actually settles the dispute rather than becoming the centre of one.

Frequently asked

Do I need to charge VAT on my invoice if I'm not VAT-registered? No — and you must not show a VAT amount or use the words "Tax Invoice" if you are not a registered VAT vendor; doing so is a genuine compliance problem, not a harmless formatting choice.

What if I forget to issue an invoice within the 21-day SARS window? A late tax invoice doesn't automatically invalidate the transaction, but it can create real practical problems for your customer's input VAT claim and your own record-keeping — issue it as soon as the gap is noticed rather than leaving it outstanding indefinitely.

Can I use a numbering system that isn't strictly sequential? Invoice numbers should be unique and traceable, and a genuinely sequential system is the simplest way to demonstrate that. Large, unexplained gaps or duplicate numbers can raise exactly the kind of questions you'd rather avoid if SARS or a court ever needs to examine your records.

Does a quote count as an invoice? No — a quote is an offer of terms before work begins; an invoice is a request for payment for work already supplied or agreed to be supplied. Keeping the two clearly distinct in your own records (and in what you send a customer) avoids genuine confusion about what has actually been agreed versus billed.

Do I need a separate invoice for a deposit versus the final payment? Yes, generally — a deposit invoice and a final invoice (for the balance, referencing the deposit already paid) keep the payment history clear and auditable, rather than one invoice trying to represent two separate payment events.

What's the difference between a pro forma invoice and a real one? A pro forma invoice is a preview of what a final invoice will look like — often used to confirm pricing before a customer commits, or to support an import/customs process before goods actually move — but it is not a demand for payment and doesn't carry the same legal weight as a genuine tax invoice. Issuing the real invoice once the supply has actually happened is still a separate, necessary step, not something the pro forma substitutes for.

Should a small business use pre-printed, numbered invoice books, or is a spreadsheet or software good enough? Either is acceptable to SARS provided the required fields are present and consistent — what matters is that the numbering is genuinely sequential and traceable and the records are properly retained, not the specific medium used to produce them. Most small businesses find dedicated invoicing software or accounting software pays for itself quickly once volume grows, mainly by removing the risk of a manually-tracked sequence going wrong.

Can I invoice in a foreign currency if my client is based outside South Africa? Yes, but the VAT and exchange-rate treatment of a foreign-currency invoice has its own specific rules under SARS's guidance — worth confirming with an accountant if a meaningful share of your invoicing is to clients outside South Africa, rather than assuming the domestic rules apply unchanged.