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EFF believes in your
business without borders


Why us?

Duni EFF is a team of over 130 specialists who for over 15 years have been offering professional accounting and tax services, as well as complete bookkeeping on international scale. We comprise a team of unique people with long experience and unmatched dedication to our work.

We started our business in 2005. We handle VAT settlements and offer comprehensive bookkeeping services on international scale. We guarantee substantial assistance with various aspects of VAT during the entire business life cycle (as we have the knowledge of tax regulations in different countries and speak 15 languages, among others). We can guarantee personalized, professional and comprehensive service. We offer assistance with bookkeeping on international scale.

All of our VAT specialists improve their competences regularly by participating in additional training, seminars and language courses. Contact with contractors and tax authorities in different countries is established in the corresponding language. Proper understanding of local regulations, language and culture is vital for ensuring success in the complex field that is international taxation and bookkeeping.

Our role is to allow you to focus on developing your business and not on the intricacies of VAT or international accounting.

That’s what Duni EFF takes care of!

Our values

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Our team

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Assistance with VAT internationally. Consulting, calculating, registration.

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Assistance with creating a company and bookkeeping in Poland and abroad.



Accounting and consulting services to help manage payables.



See what else we can help you with to enhance your business effectiveness.


Contact us today to discuss
how we can best help your company!

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Trusted by:

Clients about EFF

  • We are happy to recommend EFF company thanks to our successful cooperation so far. High quality of performed services, high availability and a wide scope of their offer are of a great value. Their trustworthiness is based on professional business service and efficient communication with a client.
    Agnieszka Strycharz
    Chief Accountant, Monolith Group
  • We have the pleasure to work with Duni EFF within VAT Compliance services, which we can honestly recommend for any company seeking a professional support in tax related problems or similar. We can always count on their reliable advice and prompt answers to all of our questions. Duni EFF experts’ big commitment and individual approach to a client cannot go unnoticed. Their high competence and vast professional knowledge ensure all our needs are met and it facilitates efficient cooperation.
    Małgorzata Łysio
    Administration Specialist,
  • Across the years of working with Duni EFF, we developed a fantastic professional relationship. Their services to us included AR and AP and I have to say, nothing was ever too much or too little for them to help us with. They were very efficient and knowledgeable, you could say I learned a thing or two from them! It was a pleasure to work with them.
    Sophie Thompson
    Payroll Specialist, Cloetta UK
  • Duni EFF are tax professionals in the European Union. In cooperation with them, I especially appreciate the individual approach to each case. In international sales, there are often non-standard situations, from which they always find a way out. Their experts have extensive knowledge and provide it in a very accessible way. Duni EFF is a proven, reliable partner in business.
    Miłosz Wójcik
    Chief Product Officer Nethansa
  • We at Euroflorist are very pleased with EFF's high competence and ability to adapt to our changing needs.
    Per Gränse
    CEO, Euroflorist
  • During our 5-years of cooperation with EFF we have significantly reduced operating costs and improved quality and transparency of our processes. Very positive and somewhat unexpected for us is how fast and smooth implementations have been.
    Hans Petterson
    Finance Director
  • I would strongly recommend the services of EFF. We have transferred a large part of our AP processes to EFF. The transfer was very efficient and unbureaucratic. The employees of EFF are very ambitious, focused and it is a pleasure to work with them. Thus we were able to increase the reliability and quality of our AP with the same number of employees. Through the competence and experience of EFF, at a good value for money, we can concentrate better on our main business.
    Jorg Schulz
    Sales Director
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