Ireneusz Leśniewski - Tax Specialists

Comprehensive services in tax advice, business consulting, audit, accounting and broadly understood legal & commercial issues.

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what makes us different?

advising the best

Our customers are renowned business, TV, film & theatre, as well as sports pesonalities.

comprehensive approach

Depending on our customers’ needs, we work with chartered auditors, expert witnesses, legal advisers, public notaries and banks.

our philosophy

Our philosophy is very simple – individual approach and total satisfaction of our customers.


We`re professionals who go about our business with passion and commitment, conforming to highest standards of excellence.

about us

IL Tax Specialists have been providing comprehensive tax advice, business consulting, audit, accounting, as well as legal & commercial services since 1998. We take pride in exceeding the highest standard of service by building and maintaining a friendly atmosphere in our customer relationships. This has everything to do with your matters being in good hands.

Our philosophy is simple – keeping our customers satisfied. We practise individual approach to every client and treat your business as if it were our own. Depending on our customers’ needs, we work with chartered auditors, expert witnesses, legal advisers, public notaries and banks.

Ireneusz Leśniewski, MSc

CEO & Owner
  • Ireneusz Leśniewski was born in Warsaw, where he and his family live from ages. His grandfather founded his first company in 1907. Merchant traditions in his family survived till this day.
  • A University of Warsaw alumnus Ireneusz Leśniewski has been working with, taxes ever since graduating from the school’s renowned Management Faculty in 1992.
  • Between 1993 and 1998 he worked with an audit company "Sadren Sp. z o.o.", where he specialized in tax issues.
  • He is a member of the Polish National Chamber of Tax Advisers ( and has full professional liability coverage
  • Since 1993 he has successfully managed and co-managed a number of individual enterprises and companies.
  • He is passionate about sports, particularly about football.
  • He runs marathons ~ 4 hours.

Why us?

our services

business consulting

  • We build optimal and effective business models for companies operating in the Polish market based on a modern and unique system that in itself is a result of many years of experience.
  • We conduct an independent and professional assessment of business activity in relation to legal framework, as well as to clients’ internal norms and regulations.

consulting and audit

  • legal & tax consulting
  • financial consulting
  • tax & legal audit
  • accounting audit

legal & commercial consulting

  • tax & accounting consulting
  • conducting due diligence processes and reports
  • write-up of tax opinions
  • analysis of contracts for their economic and tax consequences
  • write-up of tax office ruling appeals
  • representing our clients in every step of tax proceeding and/or legal action


  • assistance with company registration
  • contract/agreement template write-up
  • write-up of statutes and regulations
  • assistance with obtaining financing

building management models

  • We conduct an in-depth business analysis of environments that our clients operate in and help them properly define their goals. We actively participate in planning; we create organizational structures, as well as incentive and motivational schemes for employees. We also help formulate, put into operation and follow through strategies that are optimal from our clients’ perspective.

other services

  • accounting services for selected clients
  • representing client in dealings with key financial institutions in Poland: Inland Revenue [Urząd Skarbowy], Central Statistical Office [GUS], Polish Central Bank [NBP], The Polish Social Insurance Institution [ZUS]
  • drafting of nominate and innominate contract templates
  • preparing a debt enforcement procedure
  • maintaining and keeping of share register
  • mainatining and keeping of Management Board resolutions register
  • registering or executing changes in the National Business Registry Number [REGON] system
  • filling out National Court Register [KRS ] and other forms
  • filing KRS applications including collection of updated KRS transcripts
  • conducting a complete registration process of a company (Court, REGON, Inland Revenue)
  • accounting helpdesk
  • filling out financial and insurance institutions forms and applications
  • creating budgets
  • creating business plans
  • creating marketing & sale plans


selected clients

Clients we are proud to work with:

  • APA - Austrian Presse Agentur (Austria)
  • Altis Holding Sp. z o.o. (Ukraine)

  • BM Sp. z o.o. (India, United Arab Emirates)
  • BMG Music Publishing Poland Sp. z o.o.

  • Władysław Jerzy Engel (former head coach of the Polish national football team)
  • EPRASA Sp. z o.o.

  • Fundacja Open Art Project
  • Fundacja Teatru Montownia

  • GEOTERMAL Sp. z o.o. (Ukraine)
  • GOODIE FOODIE (healthy food)

  • HALDON Sp. z o.o.

  • Indigobird Sp. z o.o.
  • Instytut Adama Mickiewicza
  • Instytut Fizyki PAN (Institute of Physics, Polish Academy of Sciences)

  • Jacek Sylwin Management
  • JBF Group Sp. z o.o.

  • Maciej Kuroń

  • Wojciech Mann
  • MM Communications Sp. z o.o
  • MA-Je-R Sp. z o.o.
  • Krzysztof Materna

  • Newton Media Sp. z o.o.
  • Newton Technologies (Czech Republic)
  • NOVARTIS Sp. z o.o.

  • ORANGE / IDEA PROKOM OPEN (financial & legal services for ATP/WTA tournaments in Poland)

  • Personel 4U Sp. z o.o.
  • Polish News Bulletin Company Sp. z o.o.
  • POLONIA WARSZAWA S.A (from December 2014)
  • PIGTIS (Polish Commercial Chamber for Transport and Shipping)

  • Rafał Rutkowski
  • ROOTS PR Sp. z o.o.

  • SHOEBOX Sp. z o.o. (Hungary)
  • SOVPOLDA Sp.z o.o.

  • TOK FM (Inforadio Sp. z o.o.)
  • Transervice (Belarus)
  • TSW Holding (Holland, Belarus)


If you require more information about the scope of our services or if there is anything you would like to ask us, please fill out the below form.

„Kancelaria Doradztwa Podatkowego – Ireneusz Leśniewski”
ul. Adama Mickiewicza 12 lok. 2A
01-517 Warszawa Poland

tel: +48 22/ 839-14-43 022/ 839-77-23