Tax number register

The tax numbers of people working at a shared construction site must be listed in the public register of tax numbers.

You can use the public register to check that the names and tax numbers printed on the name tags of the people working at the site are on the Tax Administration’s register. In addition, the employer or the provider of the name tag can use the public register to ensure that the tax number given by the worker matches the one in the register.

Check the register of tax numbers

This website is within the public domain and requires no signing or logging in.

Check the registration with the employee’s name and tax number

You must enter the person’s full name (first name and last name) and tax number into the register.

The search result shows whether the person is listed in the register with the tax number you entered. Just the name or the tax number is not enough – first name, last name and tax number are all required. The search result shows whether the name and the tax number match. The search result does not have any additional information, such as the individual’s personal ID.

Entry into the tax number register must be requested separately

Even if a worker has a tax number, they are not automatically listed in the register of tax numbers.

Registration can be requested by

  • the worker
  • the employer
  • the project supervisor at the construction site

In addition, the Tax Administration may also enter individuals in the register on its own initiative.

Removal from the register

The Tax Administration may remove an employee from the register if no employee details have been filed for the worker in the past 2 years. The Tax Administration does not send the employee any notifications of the removal. If necessary, employees can be re-registered with the same tax number. Employees can also ask for their records to be removed from the register.

The worker’s employer or some other party who had originally asked for the worker to be entered in the register cannot ask for them to be removed. Every employer has their own identifiers that the tax numbers are registered to, but each tax number is personal to each worker. Therefore, the employer or the construction site’s main contractor cannot have the right to request a worker’s removal from the register. Only the worker can determine whether they wish to remain in the register even if their work in construction ends.

Frequently Asked Questions

Your tax number must be listed in the public register of tax numbers for the building sector if you work at a shared construction site. Your tax number is not automatically added to the register. If you want your tax number to be registered, you must request it.

The tax number register has been updated in accordance with the data protection regulation that came into force on 28 February 2019. The Tax Administration has removed the tax numbers of individuals who have not been included on any employee reports in the past two years.

The tax numbers removed from the register include a large number of employees in the cleaning and security services sectors.

Some of the individuals whose tax numbers have been removed may have worked at small renovation sites or somewhere else outside shared construction sites. In these cases, employees are often added to the tax number register even though it is not required. It is also not required to submit reports on these employees to the Tax Administration.

Employees and self-employed individuals – how to request registration

If you have a Finnish personal ID

You can request that your tax number be entered in the public register.
Call the service line for tax numbers 029 497 070 (standard call rates) or visit a Tax Administration office.

If you do not have a Finnish personal ID

Visit a tax office in person in order to receive a personal ID and a tax number. After you have a personal ID, you can request that your tax number be entered in the public register.

Employers – how to request registration of an employee

  • You can ask the Tax Administration to register a tax number in the Ilmoitin.fi e-service.
  • Tax numbers are only listed in the public register automatically if you use the e-service to request tax numbers for at least 20 workers.
    You can also make the registration request before the workers are in the tax number register, if you already have the tax numbers.

You can also register a tax number by calling the service number 029 497 070 (standard call rates) or by visiting a Tax Administration office.

Specifications - Direct data transfers and other e-filings  > Requests for individual tax numbers.