Tijsjoris Mooij-Groot (TJ)
Studied musicology in Utrecht and remains a hobby musician, playing jazz and rock on guitar and bass. His background in music strongly influences how he works: practical, creative, and closely connected to the realities of the cultural sector.
Alongside founding Mijn Belastingman, TJ worked in a wide range of productional and financial roles within the classical music sector, gaining hands-on experience. To complement this practical experience, he later studied tax law and accounting for several years, building a solid technical foundation.
By combining sector-specific insight with tax and accounting expertise, TJ helps clients navigate complex financial situations with clarity and confidence.
Tatjana Zimre
Works as an assistant and junior tax ninja at Mijn Belastingman and is directly involved in day-to-day client support. She helps with VAT returns, income tax preparations, accounting support, and applications such as A1 certificates and VAT exemptions.
She is a historical oboe player with a background in music studies in Salzburg and Amsterdam and remains active as a freelance musician with various orchestras. Alongside her musical career, Tatjana has studied law, economics, and arts management, combining creative insight with strong analytical and organizational skills.
Tatjana speaks German and Russian fluently, which is particularly helpful in cross-border cases. And as any musician will recognize: the work doesn’t stop on tour — she continues to monitor client messages whenever possible.
Evan Buttar
Having joined Mijn Belastingman as junior tax ninja in June 2026, Evan is directly involved in day-to-day client support. Along with Tatjana, he helps with VAT returns, income tax preparations, accounting support, and applications such as A1 certificates and VAT exemptions.
He enjoys a varied and international performing career on both the historical cello and viola da gamba as a freelance musician. He studied music in Ottawa and The Hague, and is passionate both about music-making and helping others navigate their Dutch tax adventure.
Originally from Vancouver, Canada, Evan is a native English speaker and additionally a US citizen, giving him insight into both Canadian and US tax regulations.
Flip Lijnzaad
As the most recent addition to the Mijn Belastingman team, Flip is helping out with income tax preparations and VAT returns.
He discovered his passion for financial administration when he was the treasurer of his student choir in Utrecht. Having studied Artificial Intelligence and Logic & Philosophy, Flip brings a strong analytical foundation and a keen eye for detail. He loves helping people navigate the tax landscape so they can focus on their passion.
In his free time, Flip enjoys making music in any form - be it singing, or playing guitar/bass/piano/trumpet.