What Is a Tax Invoice? A Practical Guide for South African Small Businesses

You send a client an invoice and they come back asking for a tax invoice. Or maybe you're the one asking your supplier for one and not sure why it matters. Either way, it's one of those things that feels more complicated than it is - and in South Africa, getting it right has real implications for your VAT.

This guide explains what a tax invoice is, what SARS requires it to contain, when you need to issue one, and how it differs from a regular invoice or a proforma invoice. If you're VAT-registered, or thinking about registering, this is worth knowing.

What is a tax invoice?

A tax invoice is a legal document issued by a VAT-registered business when it sells goods or services. It's the document your customer needs in order to claim back the VAT they paid - which means getting it right matters not just for your records, but for theirs.

Under the VAT Act of 1991, only businesses that are registered for VAT can issue a tax invoice. South Africa's current VAT rate is 15%. A tax invoice shows exactly how much of the total amount you charged was VAT, and it gives both SARS and your customer a clear record of the transaction.

Tax invoice vs regular invoice

A regular invoice is a request for payment. Any business can issue one, regardless of whether they're registered for VAT. It records what was sold, how much it cost, and who owes who money.

A tax invoice does all of that, but it also meets the specific requirements set out in section 20 of the VAT Act. It must show the VAT charged separately, include your VAT registration number, and contain all the fields SARS requires. It's a legal document, not just a billing document. This matters because a customer can’t claim back their VAT without a valid tax invoice. However, if your business is not VAT-registered, you can only register a regular invoice.

Do you need to register for VAT?

Before you can issue a tax invoice, your business needs to be registered for VAT. Here's how that works:

Compulsory registration applies when your total sales exceed R2.3 million in any 12-month period. Once you cross that threshold, you must register with SARS within 21 business days.

Voluntary registration is available if your total sales exceed R120,000 in a 12-month period but haven't yet reached R2.3 million. Registering voluntarily can make sense if your customers are VAT-registered businesses, because it allows them to claim back the VAT you charge them.

If you're not sure where your business stands, it's worth reading our summary of the 2026 VAT and turnover tax threshold changes which covers the latest figures and what they mean for small businesses.

When is a tax invoice required in South Africa?

SARS sets out three thresholds that determine what kind of document you need to issue to your customers:

• R50 or less - no tax invoice is required. A till slip or sales docket showing the VAT charged is enough.
• Between R50 and R5,000 - an abridged tax invoice is required.
• Over R5,000 - a full tax invoice is required.

Whichever threshold applies, you must issue the document within 21 days of completing the sale or delivering the service. Issuing it late doesn't make it invalid, but it does mean you're not meeting SARS's rules.

Full tax invoice vs abridged tax invoice

The difference between a full tax invoice and an abridged tax invoice comes down to how much detail you need to include about the person you're invoicing.

• A full tax invoice (for sales over R5,000) requires both your details and your customer's details - including their VAT registration number if they're also registered for VAT.
• An abridged tax invoice (for sales between R50 and R5,000) only requires your details as the supplier. You don't need to include the customer's VAT number.

Both documents must include the words "Tax Invoice", "VAT Invoice" or "Invoice", a unique invoice number, the date, a description of the goods or services, and the VAT amount in rands.

What must a tax invoice include? SARS requirements

Here are the fields your tax invoice must contain to be accepted by SARS. Use this as a checklist when setting up your invoice template.

Required on all tax invoices (abridged and full):

• The words "Tax Invoice", "VAT Invoice" or "Invoice"
• Your business name and address
• Your VAT registration number
• A unique invoice number, issued in order
• The date the invoice was issued
• A description of the goods or services supplied
• The quantity or volume of goods or services
• The value of the supply
• The VAT amount charged, shown separately in rands
• The total amount including VAT, in rands

Required on full tax invoices only (sales over R5,000):

• Your customer's name and address
• Your customer's VAT registration number (if they are registered for VAT)

Things to double-check before you send a tax invoice

It's easy to miss a field when you're busy. Here's what to look out for before you hit send:

• Your VAT number - it needs to appear on every tax invoice you issue. On a full invoice, your customer's VAT number needs to be there too.
• An invoice number - make sure each invoice has a unique number and that they run in order. A date reference on its own is not enough.
• VAT shown separately - the VAT portion needs to be broken out clearly in rands, not just included in the total.
• The currency - all amounts need to be in South African rands. If you work in a foreign currency, include a conversion to rands as well.
• The words "Tax Invoice" - the document needs to be clearly labelled "Tax Invoice", "VAT Invoice" or "Invoice". A document titled "Quote" or "Statement" won't be accepted by SARS.
• The date - a tax invoice needs to be issued within 21 days of completing the sale or delivering the service. If it goes out late, it may not be accepted even if everything else is correct.

Getting all of these right means your customer can claim back their VAT without any issues, and it keeps your records clean on your side too.

What is the difference between a proforma invoice and a tax invoice?

A proforma invoice is a document you send before a sale is confirmed. It looks like an invoice and sets out the expected price, but it's not a request for payment and it can't be used to claim VAT. Think of it as a detailed quote, useful for giving your customer a clear picture of what to expect before they commit.

A tax invoice comes after. Once the goods have been delivered or the work is done, that's when you issue the real thing. It's the legal document that records the actual transaction and that SARS accepts for VAT purposes.

In practice, the two documents do different jobs. Say a client asks you to quote on a large job before they get approval to go ahead. You send a proforma so they have something concrete to take to their decision-makers. Once they give you the go-ahead and you complete the work, you issue a proper, numbered tax invoice. The proforma doesn't get updated or converted, it gets replaced.

When to use a proforma invoice

A proforma invoice is useful when:

• A new customer wants a detailed quote before committing
• A large order needs approval from your customer's side before it can go ahead
• You're asking for a deposit before starting work
• You need to provide a cost estimate for customs or an international transaction

It should always be clearly marked "Proforma Invoice" and ideally include the words "This is not a tax invoice" to avoid any confusion.

When to issue the tax invoice

Once the goods have been delivered or the service has been completed, a VAT-registered business must issue a valid tax invoice within 21 days. That's the document that goes on record for both you and your customer.

How to issue a tax invoice correctly

Once you have a template that includes all the required fields, issuing a correct tax invoice becomes a straightforward part of your routine. A few things worth keeping in mind as you get set up:

• Number your invoices in order and keep them that way. SARS requires invoices to be numbered in sequence, so avoid skipping numbers, reusing them, or starting fresh at the beginning of each year.
• Make sure your VAT number is easy to find on the document. It should be clearly visible, not tucked away in small print.
• Show the VAT separately. Your invoice should have three clear lines: the subtotal, the VAT amount (15%), and the total. Including VAT in the total without breaking it out is not enough.
• Hold on to your invoices for at least five years. SARS requires you to keep both the invoices you issue and the ones you receive for a minimum of five years. If SARS ever questions a VAT return, these are the records you'll need.

If you'd rather not manage all of this manually, a digital tool can take a lot of the admin off your plate. iK Invoice is one option for sending digital invoices and tracking payment. For more on how to get paid faster, read how to get paid like a pro with iK Invoice.

Manual vs digital invoicing

A Word or spreadsheet template is a perfectly reasonable place to start. The main risk is human error - a field gets missed, a number gets duplicated, or a document doesn't get saved. Digital invoicing tools reduce those risks by numbering invoices automatically, storing records, and making it harder to leave out required fields. If you want to take it further, iK Accounting includes VAT reporting and bookkeeping in one place, which can make managing your VAT returns easier.

Record-keeping and VAT submission

Keeping your invoices organised is one of those habits that pays off when you need it most. SARS requires you to hold on to both the invoices you issue and the ones you receive for at least five years. When you submit your VAT return, having those records on hand means you can support your VAT claims without any stress. Without a valid tax invoice for a purchase, you won't be able to claim that VAT back, so it's worth having a simple system for storing them.

Getting your invoicing right is also part of managing your cash flow well. Read more about how invoicing affects your cash flow.

Getting your tax invoices right in your business

Once you have a template set up with all the required fields, issuing a correct tax invoice is just a matter of filling it in and sending it to your customer.

When your invoices are correct, your customers can claim their VAT back without any issues, your records are clean, and there's nothing to worry about if SARS ever has questions. It's a small thing to get right that makes a real difference - for your business and for your customers.

For more on managing your business finances day to day, read 8 Money Management Tips to Boost Your Business.