Setting up and using your data box (datová schránka)

The state's official electronic mailbox — automatic for the self-employed, and legally binding once delivered.

What this actually is

A data box (datová schránka) is an official electronic mailbox run by the state. Messages delivered to it count as legally served whether or not you read them, and self-employed people with an IČO have one set up automatically. Ignoring it is how deadlines get missed.

Who it applies to

Self-employed people, company directors, and anyone who activates a personal data box voluntarily.

When it's required

As soon as you receive the access credentials — normally by post after your IČO is issued.

Step by step

1
Watch for the credentials letter
Access details arrive by post to your registered address. Chase them if your licence is issued and nothing arrives.
2
Log in and change the password
Use the official portal at mojedatovaschranka.cz.
3
Turn on email notifications
Otherwise you only find out about a message after it is deemed delivered.
4
Understand the delivery fiction
A message is treated as delivered ten days after it arrives, even if unopened.
5
Use it for filings
Tax returns, insurance overviews and office correspondence can be sent from it without a separate signature.

Documents to bring

Access credentials letter, or a recognised electronic identity
IČOIssued with the trade licence

Who decides

Digital and Information Agency (DIA)

Official information

Data boxes — official portalOfficial source
Digital and Information Agency (DIA)Official source

Last checked: 1 September 2026

This is a plain-English explanation, not legal advice. Requirements change and individual cases differ — confirm with the responsible authority before acting. Information last checked 1 September 2026.