What is a national number and how many digits does it have?

A national number - which is also called an organisation number, company number or branch unit number - is a unique code given to you by the government (Law of 24.6.2003). Your national number has 10 digits. It is important that you enter the full number in this application form, with no spaces. If your number has only 9 digits, you should add an extra 0 at the beginning. For example, do not write: 793589456. Instead, write your actual national number, which is: 0793589456. It is important not to add any spaces. All the digits must be together, with no spaces.

Only if your organisation does NOT have a national number, are you allowed to enter 0 where you are asked for your national number.

More information about national numbers is available here