You can obtain a Finnish VAT number by registering at the VAT Register, which is maintained by the Tax Administration.
In the EU area, businesses use value-added tax (VAT) numbers to indicate their VAT liability. With these numbers, businesses engaging in international trade can assure their partners that they have been registered for VAT.
Foreign companies must become VAT registered if VAT is to be charged on their sales of goods or services, and if the operation gives rise to a permanent establishment for VAT purposes. Foreign companies have the option to apply for VAT registration on a voluntary basis.