Rental work cannot be invoiced through an invoicing company. According to the policy set by the tax authority, an employment relationship forms between the work performer and the rental work provider. This cannot be invoiced through a third party.
The work done via an invoicing company must be assignment based.
UKKO.fi may request confirmation from the assignment-providing client that the work performance will not be sold forward in such a way that it may be viewed as leased or rented work.