Do you use cashier machine in your business? Is it necessary to you use it in Thailand?

What type of business are you thinking of? Self service type of supermarkets always have one, and so have chain type shops and restaurants. Other types of small shops almost never have one, and big shops have them sometimes. In restaurants that don't belong to a chain they are rare.

Of course a cashier machine facilitates checking on the staff. As far as filing tax returns is concerned, all I can say is that in the 17 years I have been active in the hospitality sector (hotels, restaurants) no bookkeeper/accountant or tax office official has ever suggested to me I should get a cashier machine.

Thank you for your answer.

I have other ways to check my staff... But how can tax office official check revenue of my company if I'll not use cashier mashine/POS terminal?