What counts as a valid tax invoice?

SARS sets specific requirements — the words 'tax invoice', the supplier's name and VAT number (and, above a certain value, yours too), the date, a description of what was supplied, and the VAT shown correctly. The exact detail required depends on the invoice value. If you're unsure your supplier invoices qualify, we can check a sample and tell you what's missing before it costs you a claim.

I've gone over R2.3 million — how quickly must I register?

Once you cross the compulsory threshold you have 21 business days to register with SARS — don't sit on it. Trading over the threshold while unregistered exposes you to the VAT you should have been charging and collecting. Come to us as soon as you see the figure approaching and we'll handle the registration cleanly.

I've been claiming VAT off till slips — is that a problem?

Potentially, yes. Standard till slips often don't meet the tax-invoice requirements for claiming input VAT, particularly above a certain value where a full tax invoice is required. Those claims can be disallowed at audit with penalties and interest. It's worth reviewing what you've been claiming and tightening it up before SARS does it for you.

Should I register for VAT voluntarily before I have to?

Sometimes it helps — if your customers are themselves VAT-registered, being registered lets you claim input VAT on your own costs without the 15% putting off your buyers. If you sell mainly to the public, adding 15% can just make you dearer. Voluntary registration is available from R120,000 of taxable supplies; whether it's worth the extra admin depends on who you sell to, so it's worth a quick conversation first.

VAT Mistakes That Quietly Cost SA Businesses Money

VAT is where good businesses lose money without ever seeing it happen. The rate is a simple 15%, but the rules around when to register, what you can claim and what SARS will accept as proof are unforgiving. Most VAT damage isn't dramatic — it's a slow drip of disallowed claims, penalties and missed thresholds that only surfaces at audit, by which point it's expensive. Here are the mistakes we see most, and exactly how each one quietly costs you.

1. Claiming VAT without a valid tax invoice

This is the big one. You can only claim back the input VAT on a purchase if you hold a valid tax invoice that meets SARS's requirements — the words "tax invoice", the supplier's name and VAT number, the date, a description of the goods or services, and the VAT shown correctly. A till slip, a quote, a pro-forma, or a supplier's invoice that's missing details simply doesn't cut it. At audit, SARS disallows every claim you can't back up with a compliant tax invoice, and you repay it with penalties and interest. The VAT was real; the paperwork just wasn't good enough — and "I definitely paid it" is not a defence SARS accepts.

Before you claim input VAT on anything sizeable, actually check the supplier's invoice qualifies — that it carries their VAT number and the right wording. No valid tax invoice, no claim. This one habit prevents more clawbacks than any other.

2. Missing the rolling-12-month threshold

VAT registration is compulsory once your taxable supplies exceed R2.3 million in any rolling 12-month period (from 1 April 2026, up from R1m — SARS adjusts these annually). The word that catches people is rolling. It's not your financial year and it's not the calendar year — it's any consecutive 12 months. A strong run of trading can push you over mid-year, and if you don't spot it, you're trading unregistered when you're legally required to be registered. SARS can then come after the VAT you should have charged and collected — out of your own pocket, because you can't easily go back to customers months later for 15% you never invoiced.

21 business days

the window to register for VAT once your taxable supplies cross R2.3m over any rolling 12 months — miss it and you're trading non-compliant

3. Charging VAT before you're registered

The opposite mistake, and it's serious. You cannot charge VAT until you're actually registered and have a VAT number. Some new businesses add 15% to their invoices assuming registration is a formality that'll catch up — but collecting VAT you're not entitled to collect is money that isn't yours, and it creates a real problem with both your customers and SARS. Charge VAT from the day your registration is effective, not the day you apply, and never before.

4. Missing the VAT201 deadline

VAT returns are filed on a VAT201 every two months, with payment due by the 25th. Miss it and SARS applies penalties and interest automatically — no reminder, no grace period. Because it's every second month rather than monthly, it's genuinely easy to lose track of which cycle you're in and let a period slip. A missed VAT201 is one of the most avoidable costs there is: it's a diary problem, not a money problem, until the penalties turn it into one. Filing a return late even when you have nothing to pay still attracts a penalty, so the rule is simple — submit every period on time, on the money, every time. Set a standing reminder for the 20th of each filing month so there's a buffer before the 25th, and reconcile your VAT account before you file rather than after.

5. Forgetting VAT is due on the invoice date, not the payment

On the standard invoice basis, you owe SARS the VAT on the tax-invoice date — when you raise the invoice — not when the customer actually pays. Businesses that don't plan for this get caught handing over 15% on sales they haven't collected yet, straining cashflow at exactly the wrong moment. Once you're VAT-registered, a slow-paying debtor doesn't just delay your income — it can force you to fund SARS out of your own reserves in the meantime. The businesses that stay eligible for the payments basis (where VAT follows the money actually received) can sidestep this, but eligibility is limited — so for most, tight debtor control is the only real defence.

6. Claiming input VAT on the wrong things

Not every rand you spend carries reclaimable VAT, and claiming where you can't is a classic own goal. You can't claim input VAT on purchases from a supplier who isn't VAT-registered (there's no VAT in the price to reclaim), on entertainment, on most passenger vehicles, or on anything used for private rather than business purposes. Owners who claim the notional 15% on a car purchase or on staff entertainment are quietly building a liability that surfaces at audit. When a cost is part business and part private, only the business portion's VAT is claimable — and you need the apportionment to be defensible.

Worked example

The claim that gets clawed back

A business claims R45,000 of input VAT across a two-month period, confident every rand was genuinely spent. At audit, a third of it sits on invoices missing the supplier's VAT number or the right wording. SARS disallows that portion — so R15,000 goes straight back, plus penalties and interest on top. The spend was 100% real; the invoices simply weren't compliant. That's the entire mistake, and it's a common one.

7. Treating VAT you've collected as your money

This one sinks businesses. The output VAT you charge customers is not income — it's tax you're holding on SARS's behalf until the next VAT201. If it flows through your general account and gets spent on stock or wages, you reach the 25th with a liability and no cash to meet it. The discipline that saves owners here is simple: treat collected VAT as ring-fenced from day one, ideally swept aside so it's there when the return falls due.

VAT rewards being systematic

None of these mistakes come from dishonesty — they come from VAT being fiddly and easy to get slightly wrong at scale, invoice after invoice. The fix is a system: valid tax invoices filed properly, the rolling threshold tracked monthly, returns diarised, the VAT you collect kept separate, and the cashflow timing understood. If you're registered — or about to cross the threshold — and any of this feels shaky, talk to us. Getting VAT right is far cheaper than fixing it after an audit finds it for you.

VAT mistakes that quietly cost SA businesses money