In some retail facilities, sellers require the buyer to provide an IIN when making a purchase. Is it legitimate? When using a cash register machine, a cash register receipt or a sales receipt is issued for the amount paid for the product, work, or service. There is also a list of information that the KKM receipt must contain (paragraph 6 of Article 166 of the Tax Code). At the same time, an online CCM receipt at the request of the buyer (client), recipient of goods, works, and services, in accordance with paragraph 7 of Article 166 of the Tax Code, must contain the identification number (IIN) of the buyer (client), recipient. Thus, when selling goods (performing work, rendering services), the seller is obliged to issue a receipt to the KKM and only at the request of the buyer (client) to reflect the IIN of the buyer (client), the recipient, in the receipt of the KKM. Department of Explanatory Work and Contact Center State Duma of the Pavlodar region

Source : https://www.gov.kz/memleket/entities/kgd-pavlodar/press/news/details/981430?lang=kk