Every freelancer needs a financial side-kick.
These guys are recommended by freelancers from The Freeforce:
http://www.waterlandadministraties.nl/
http://www.adminkantoorboersma.nl/
http://vanloman.nl/index.php/nl/partners/70-laurens-lor
http://www.fidence.nl/partner.html
http://www.agaathadministraties.nl/