What is a POS system, really? Beyond the cash drawer

If you ask ten merchants what a point of sale is, nine will describe a screen and a drawer. That description is why so many shops buy a cash register and discover a year later that they have no idea what they sold.

A point of sale is four systems sharing a screen.

1. The sales engine

What everyone sees: items, modifiers, discounts, payment. The parts that matter are the ones that only show up under pressure.

• How many taps for your most common sale?
• Can a sale be held and resumed while the next customer is served?
• Can a bill be split by item, equally, or by custom amount?
• Can one sale be paid part cash, part card?
• What happens when the card is declined halfway through?

A sales engine is judged at 8pm on a Thursday, not in a demo at 11am.

2. The inventory ledger

Every sale is also a stock movement. This is the half of the system that decides whether, three months in, the number on the screen matches the shelf.

• Variants — size, colour, flavour — as one product with children
• Units of measure — buy by carton, sell by piece
• Multiple locations — the floor and the stockroom are different
• Receiving against purchase orders
• Stock counts with a variance report
• Reorder points with a suggested order

A system without this is a till. A till is fine for a stall and a liability for a shop.

3. The compliance device

Since ZATCA Phase 2, your point of sale is a regulated instrument. It holds a cryptographic certificate issued to that specific terminal, signs every invoice, chains each invoice to the one before it, and reports to the authority.

This is not a feature. It is a legal characteristic of the device, and it is why "can I just use a cash register?" has a different answer now than it did in 2020. See thePhase 2 guide.

4. The reporting layer

The part owners actually use, once the novelty of the screen wears off.

• Sales by hour, by day, by product, by category, by cashier
• Gross margin — which requires cost prices, which requires the inventory ledger
• Voids, discounts and credit notes by staff member
• Shift reconciliation: expected cash against counted cash
• Stock on hand, stock movement, shrinkage

Reporting is only as good as the data underneath it, which is why a system with weak inventory also has weak reports, no matter how many charts it draws.

What a POS is not

It is not an accounting system. It records sales; your accountant records the business. A good POS exports cleanly to accounting software — Wameed exports to Qoyod, QuickBooks and Xero. A POS that claims to replace your accountant is usually claiming too much.

It is not a payment terminal. A payment terminal takes money. A POS knows what the money was for. Some products do both; see ourHala comparison for where the line falls.

It is not a spreadsheet you can put off buying. The spreadsheet works until roughly the point where you have staff, and then it becomes the thing nobody updates.

How to tell a real POS from a till

Five questions:

1. If I sell an item, does the stock go down, and can I see by how much?
2. Can I raise a purchase order and receive against it?
3. Does it sign ZATCA invoices on the device?
4. Can I see gross margin by product?
5. Can I stop one cashier from issuing refunds?

A yes to all five is a point of sale. Two or three yeses is a till with ambitions.

Which one do you need?

A till is enough if: you carry no stock, have no staff, and sell a handful of line items — a stall, a service, a pop-up.

You need a point of sale if: you carry stock, employ anyone, have more than one payment method, or expect to open a second location.

The cost difference between the two is smaller than the cost of one bad month of unmanaged stock. Seehow to choose for the method, and thefeatures page for what a complete system contains.