Oleg is currently working with Osler on secondment from the tax group at the Ukrainian law firm Arzinger. Oleg is a recognized taxation expert, including tax disputes, transactional and international taxation who has worked in senior positions in Canada, Malta and Ukraine, and has experience advising on international and national law. As a leading expert on taxation, Oleg has participated in landmark cases resolved in international arbitration courts.
In Canada, Oleg worked in a leading global accounting firm, where, amongst others, he was involved in developing and implementing effective international taxation solutions.
In Malta, Oleg was involved in implementing ATAD I and other BEPS-related initiatives, managing high-profile client accounts and attracting clients from the CIS region.
In Ukraine, Oleg was responsible for tax planning and structuring of investments in Ukraine and from Ukraine, M&A tax projects, corporate reorganizations, business project financing as well as tax disputes.
Areas of Expertise
Latest Insights
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Osler Update May 2, 2024
Canadian government moves ahead with Global Minimum Tax Act
Canada’s Pillar Two legislation, the Global Minimum Tax Act, is introduced in Parliament. In their Update, Patrick Marley, Oleg Chayka, Ilana...
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Osler Update Feb 23, 2024
OECD releases transfer pricing guidance on a simplified and streamlined approach (Amount B of Pillar One)
The OECD has released its first transfer pricing report on Amount B of Pillar One, which introduces a simplified transfer pricing methodology for...
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Osler Update Dec 21, 2023
OECD releases third administrative guidance on Pillar Two and confirms delay of the Pillar One timeline
The OECD has published the third administrative guidance on Pillar Two and has confirmed the delay of the Pillar One timeline.
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Osler Update Nov 10, 2023
CRA revises and expands its guidance on mandatory disclosure rules
On November 2, 2023, the Canada Revenue Agency (CRA) revised and expanded its guidance on the Canadian mandatory disclosure rules. The most important...
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Awards and Recognition
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The Legal 500: Leading expert on transactional taxation in Ukraine (2018)
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International Tax Controversy Guide (from World Tax and International Tax Review): Named one of the best lawyers in tax disputes in Malta (2019) and Ukraine (2020)
Media Mentions
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Media Mentions Mar 13, 2023
4 Key Takeaways From OECD’s Global Minimum Tax Guidance – Law360
In February 2023, the Organization for Economic Cooperation and Development (OECD) released technical guidance about new worldwide minimum tax rules...
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Osler News May 30, 2022
Oleg Chayka joins Osler’s Tax Group on secondment in Toronto
Osler is pleased to welcome Oleg Chayka to our Tax Group on secondment from Ukrainian law firm Arzinger.
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Community Involvement
- Assistance to Ukrainian mothers with children to flee the war in Ukraine and to get relocated to Malta and other EU jurisdictions
Speaking and Writing
Published Work
Ukraine Incentivizes Investments In and Operation of IT-related and R&D Projects, CEE Legal Matters (February, 2022) https://ceelegalmatters.com/briefings/19155-ukrain-incentivizes-investments-in-and-operation-of-it-related-and-r-d-projects
Legal and tax aspects of M&A projects, CFO Club, Kyiv, Ukraine (February, 2022) https://www.facebook.com/media/set/?set=a.2790375737922233&type=3
How to pay less Ukrainian taxes on foreign-source income, The Page (February, 2022) https://thepage.ua/ua/experts/yak-zekonomiti-na-podatkah-v-ukrayini-pri-otrimanni-inozemnih-dohodiv
Ukraine: Employee Incentives, The Legal 500 (January, 2022) https://www.legal500.com/guides/chapter/ukraine-employee-incentives/
Management of tax, regulatory and compliance risks in connection with investments abroad, XX Annual CFO Forum, Kyiv, Ukraine (October, 2021) https://cfo.ua/all_speakers
Tax amnesty, CEO Club, Kyiv, Ukraine (July, 2021)
Tax changes 2021 and their impact on transactions with non-residents, CEO Club, Kyiv, Ukraine (April, 2021)
Lecturer, International Tax Course, Tax Academy, Ukraine (October, 2020)
Credentials
Education
Kyiv Institute of International Relations (Ukraine)
ESC CERAM Business School (now SKEMA) (France)
Canadian Institute of Certified Public Accountants (CICA) (Canada)
Languages
- English
- Ukranian
- Russian
Professional Affiliations
- Co-Chairman of the Tax Committee of the American Chamber of Commerce in Ukraine nine times in a row
- Member of the working groups of the Parliament of Ukraine on tax reform issues
