Tax controversy

Tax has become increasingly connected — governments are collecting and sharing taxpayer information, and tax changes in one jurisdiction can now trigger changes across the globe. The result is that tax controversy is evolving from two-sided disagreement in specific countries into a multidimensional, multi-country dynamic.
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Tax controversy

The team

Photographic portrait of Bryon Christensen
Bryon Christensen
Principal, Tax Controversy, Ernst & Young LLP
Photographic portrait of Luis Coronado
Luis Coronado
EY Global Tax Controversy Leader
Photographic portrait of Jean Pierre Lieb
Jean-Pierre Lieb
EY EMEIA Tax Policy and Controversy Leader

What EY can do for you

Businesses must act so that their people, policies and systems are keeping pace. They need a line of sight into the issues and the potential for future tax controversy as well as a centralized global strategy. Should disagreements arise, having resources that can act as a “bridge” between the tax authorities and the company is essential.

Take a look at our insights, including leading practices on implementing a globally integrated approach to tax controversy management.

Discover insights from the 2025 EY Tax Risk and Controversy survey

In this webcast, panelists will explore the Tax Risk & Controversy survey findings, as well as the challenges, opportunities and actionable strategies to guide leadership agendas.

Find out more
Astronomer in photo telescope dome with red light

The team

Bryon Christensen

Principal, Tax Controversy, Ernst & Young LLP
Brings a depth of experience to any controversy. Focuses on your long-term priorities.
Seattle, WA, United States

Luis Coronado

EY Global Tax Controversy Leader
Vast cross-border experience. Well-versed in international tax. Thought leader in tax policy and controversy.
 

Jean-Pierre Lieb

EY EMEIA Tax Policy and Controversy Leader
Fascinated with tax policy and mega trends. Passionate arguer in tax controversy. Innovation inspirer.
 

Our latest thinking

How increased global competition is reshaping tax priorities

The 2025 EY Global Tax Policy and Controversy Outlook explores changing global tax policies and their impact on businesses. Learn more.

EY Americas

The Tax Leader Imperative: How do you adapt to the changing tax risk landscape?

The 2021 EY Tax Risk and Controversy Survey finds businesses are bracing for more tax disputes. Learn how to assess and help manage tax risk and disputes.

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How generative AI might help tax functions tackle challenges

GenAI can automate tasks, summarize information and provide insights, but it needs a person’s input to optimize the technology. Learn more.

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How artificial intelligence can augment a people-centered workforce

AI is disrupting approaches to talent strategy, risk and resilience. Learn why it’s crucial to blend operational gains with a people-first mindset.

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Three steps tax teams should take to prepare for quantum computing

How can tax functions prepare for quantum computing that can revolutionize tax modeling, audit resolution and fraud detection. Learn more.

EY Americas

    Invest now or pay more later: the evolving relationship between tax compliance, audit and controversy

    Steve Foster, Partner, Ernst & Young LLP, highlights the increasingly interconnected relationship between tax compliance, audit and controversy. He also addresses why organizations should prioritize robust, future‑ready compliance approaches.

    Read more on LinkedIn

    The future of transfer pricing controversy - an AI arms race?

    Joel Cooper, EY Global International Tax and Transactions Services Controversy Leader, explores the potential for an AI arms race between taxpayers and tax authorities, examining challenges and opportunities in the complex world of transfer pricing.

    Read more on LinkedIn
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