Tax or simplified invoice: 4 checks

The previous lesson separated standard-rated, zero-rated and exempt sales. This lesson covers a question that comes even earlier in every sale: is this a full tax invoice or a simplified tax invoice? The answer is not a matter of preference. It depends on who the buyer is, and it decides which fields must be on the document, fields you cannot add after the invoice has been issued and reached the Authority.

Who decides the type: you or the buyer?

Under the e-invoicing rules published by the Zakat, Tax and Customs Authority, a tax invoice is the default when you sell to another business or to a government body, and a simplified tax invoice is the default when you sell to a final consumer. So the buyer's status decides the type, not the size of the amount and not the kind of goods.

Who the buyer is	Invoice type	What sets it apart in practice
VAT-registered business or government body	Tax invoice	Full buyer details and buyer VAT number
Final consumer (individual)	Simplified tax invoice	QR code printed on the invoice

Four checks before every issue

The buyer's VAT number: if the buyer is a registered business, its VAT number belongs on the invoice and is not an optional extra. Without it the buyer cannot deduct the VAT on that invoice as input tax, and will come back asking you to reissue.
Buyer name and address: a tax invoice carries both parties' details, not the seller's alone. "Cash" or "Customer" in the name field is fine on a simplified invoice and is not fine on a tax invoice.
The QR code: required on the simplified invoice. It is what lets a buyer or an inspector read the invoice's core data straight from the printed slip.
How it reaches the Authority: in the integration phase the two paths differ. A tax invoice passes through the Authority's platform before you hand it to the buyer, while a simplified one goes to the buyer directly and a copy is sent to the Authority within the window the rules set. See the lesson on the second e-invoicing phase, and treat the Authority's published text as the source that governs.

The working rule: do not ask "how big is the amount?" to decide the type. Ask "who is the buyer?"

A concrete example: two sales in one day

The owner of a spare-parts shop sends the system a WhatsApp message:

Customer invoice, oil filter and battery, 720 riyals inclusive

The system issues a simplified invoice with a QR code and sends back an image to hand to the customer. Two hours later the owner sends:

Invoice for Eastern Transport Company, 12 batteries, 9,600 riyals

Here the system stops and replies:

This is a sale to a business, so it needs a tax invoice, not a simplified one. I am missing the company's VAT number and address. Send them, or a photo of its VAT certificate, and I will issue it.

The difference between the two cases is that the question arrived at the moment of issue, not a month later when the client's accountant calls asking for a corrected invoice. That is the real gain from issuing invoices over WhatsApp: the rule lives in the system rather than in the cashier's memory.

The common mistake: a simplified invoice for a business customer

The most frequent error is running every sale of the day through the same point-of-sale screen, so the company's invoice comes out simplified with no buyer VAT number. The loss lands on your customer first, because it forfeits the deduction, and then on you, because you have to reissue and deal with a note and a correction in your records. That is why "is the buyer a business?" deserves to be a step inside the sales procedure rather than a judgement call left to whoever is at the counter.

Checklist

Separate individual customers from business customers when you create the customer record, not when you issue the invoice.
Make the VAT number a mandatory field on a business customer's record.
Confirm that simplified invoices come out with the QR code on them.
Review weekly any large-value invoices issued to "Cash"; most of them are business sales issued under the wrong type.
When you find an invoice of the wrong type, fix it with a note and a correction, never with a silent edit or deletion.

In short: the buyer's status decides the invoice type. A registered business deserves a tax invoice carrying its name, address and VAT number; a final consumer needs only a simplified invoice with a QR code. Make that check a step inside the system, because correcting after issue costs more than asking before it.