More detail
An ETR receipt is what separates a valid business expense from a handwritten scrap. Customers ask for it so they can claim the cost with KRA. Suppliers provide it so their sales line up with their tax returns. The receipt is the proof that both sides need.
In practice, an ETR receipt looks like a normal till slip but carries tax details: the seller PIN, a control number, the VAT breakdown, and a QR code. That last item is what tells you it is genuine, because scanning it confirms the receipt reached KRA.
Related questions
What data appears on an ETR receipt?
Do I still need to issue ETR receipts?
How do I verify an ETR receipt is real?
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