Who is entitled to the deduction for the purchase of a cash register? How to configure the device to communicate with CRK via WLAN? What does the registration and settlement of advance payments look like in online cash registers? If the cash register communicates with CRK via Ethernet or WiFi, is it possible to use the same connection to communicate with the cash register from the computer (sales system)? When can a taxpayer apply to the Tax Office for a schedule change?