A few words
about ONZ

ONZkantoor is a fresh, dynamic accounting office with a high degree of professionalism. At ONZkantoor, the customer comes number one. These words might sound familiar and cliche but we challenge you to experience it yourself.

We can support you in every area of your administration. Wheter it’s about starting up your new business, taking care of tax affairs or looking after your payroll administration. Our staff is highly skilled and work under the responsibility of a BIG-4 certified Register Accountant. In short, knowledge and quality are guaranteed by ONZ..


  • The foundation of a small accounting office by three students.

  • Migration to the Wibautstraat in Amsterdam. At this point, the office is grown to a total of 14 employees.

  • Takeover of the office by the current owner. In between, the company has almost doubled his employees.

  • Continuous grow of the office forces us to move again. We are now moving from the Wibautstraat to the Nachtwachtlaan in Amsterdam.

  • We’ve been hit by the recession. The growth of the past few years changed into decline. A lot of our customers are struggling and so are we. Because of natural turnover, the company has shrinked again to a total of 14 employees.

  • Unfortunately, the decrement of the past years increased. As a result of this, we were forced to move to the Donauweg in Amsterdam and continu our business with 4 of our employees.

  • The final turnover of a long continued trend. We are back in business! We are growing again and are now working with a total of 7 employees at the Donauweg. On the 1st of september, we launched our new website. The perspective for the future is bright!


We are hiring! We are looking for 2 studens (HBO/WO) for 1 up to 3 days a week. Would you like to combine your study with some practical working experience?


ONZ team

Daan Ensing

Jan Noordeloos

Koen Putman

Gilberto Ormskirk

Harold Slingerland