Updated 16 September 2026
What to do during an internet outage or till fault in EET 2.0
An internet outage or till fault does not automatically close the business. Restore operation and submit the data afterwards within the statutory deadline.
When the internet fails
Continue trading and send the data without undue delay after connectivity returns, no later than 48 hours after the sale. Suitable software retries automatically until it receives POK.
Must I close the premises?
No. Take all reasonable steps to restore recording as quickly as possible.
Till-device fault
- 1
Record the sales
Note the data needed for later submission.
- 2
Repair the fault
Contact the supplier or service promptly.
- 3
Keep evidence
A service report or outage confirmation may help during an inspection.
- 4
Submit afterwards
Normally each sale is submitted separately; a summary is exceptional and requires agreement with the tax administrator.
What is POK?
POK confirms receipt of the data message and formal checks. It is not an offline mode and does not have to be stored or printed. If no confirmation arrives, the device may resend the message.
What if a sale is sent twice?
If the basic data fields match, the system marks the new message as a duplicate and excludes it from totals. A difference in any basic field may make it a separate sale.
Cancellation and correction
Send an incorrect or refunded sale as a negative amount. This also covers returned goods, complaints, an accidental record and a non-cash payment that ultimately failed. The cancellation is not technically linked to the original message.
How to prepare
- stable internet and optional backup mobile data
- software with automatic queued sending
- staff trained in the outage procedure
- support contact ready
- a way to record sales temporarily during a fault
Backup connectivity is a recommendation, not a separate legal duty.
Frequently asked questions
Can I sell without internet?
Yes during an outage, with later submission.
When must I send the data?
Without undue delay and no later than 48 hours after the sale.
What is POK?
The confirmation code for receipt and formal checks.
Is POK an offline mode?
No.
What if POK does not arrive?
The software should retry, including after connectivity returns.
What if a sale is sent twice?
Matching core fields cause it to be marked duplicate and not counted again.
What if the till fails?
Note sales, repair the fault and submit them afterwards.
Must I close?
No, but restore EET promptly.
How do I cancel a sale?
Submit the correction as a negative sale using the POS system.
Official sources
The information reflects current Czech Financial Administration guidance and the bill approved by Parliament.