independent professional assessments and valuations of art and objects

TAXATA is an independent art valuation firm, offering assessments, valuations and advice in a.o. the following areas:

  • Fine art (Europe, 19th, 20th and 21st century)
  • Public art, monumental art
  • Decorative art, antiques – 1500–now; trade goods China, Japan, Indonesia
  • Historical interior elements / building components
  • Art and objects with a special provenance

TAXATA has ample experience in independent, professional, substantiated valuations of artworks with a value up to 35 million euro.


Paintings by, and historical objects of Pablo Picasso; paintings and drawings by a.o. Jan Sluyters, Theo van Doesburg and Jan Schoonhoven; large scale sculptures by Auguste Rodin and Alexander Calder, monumental artwork by Lex Horn; religious silver and architectural objects by Fa. Brom; jewellery by Faberge and Lalique; et cetera.

RICS Red Book

When a valuation is relied upon by third parties, substantiation of the valuation opinion is part of the report, and additional assurances of independence and expertise may be expected. TAXATA valuations are done according to the RICS Red Book.


TAXATA was founded by in 2010. Patricia Jansma (owner/director of TAXATA) is a RICS registered, Hobeon/SKO certified valuer of art and antiques and a member of the Dutch organisation of valuers, brokers and auctioneers, the TMV. Patricia is a proud member of ICOM (International Council Of Museums), and serves as an expert witness for the Dutch Court. She is a member of PAIAM (Professional Advisors to the International Art Market) and has written about valuation for amongst others the Boekman Stichting, and Kluwer Publishers (Kwartaalbericht Estate Planning and Weekblad Fiscaal Recht)

Please contact us for more information.