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Tax Disputes and Investigations

The global tax landscape has undergone radical change in recent years.  In the face of growing pressure to crack down on perceived tax avoidance by multinationals and high net worth individuals, tax authorities including HMRC are becoming increasingly proactive.  All taxpayers now face an increasingly complex and hostile environment, with unprecedented levels of scrutiny over their tax affairs.

Against this backdrop, tax disputes are on the rise and can cause both financial loss and reputational harm.

Why use CMS for Tax Disputes and Investigations 

As part of the CMS global network with tax capability in over 70 offices, the CMS Tax Disputes & Investigations team is well-placed to advise on all forms of (direct and indirect) contentious tax matters.  

Our dedicated specialists have a wealth of experience guiding both individuals and corporates (across a wide range of sectors) through all aspects of tax dispute prevention, management and resolution.

Areas of expertise

Work undertaken by the CMS Tax Disputes & Investigations team includes:

Contact the CMS Tax Disputes & Investigations team now for advice

Without proper management, even seemingly straightforward enquiries or compliance checks can quickly spiral out of control.  If you are concerned about an ongoing (or potential) tax dispute or investigation, please contact a member of our team as soon as possible to help protect your position.  

Aside from tax disputes and investigations, CMS can also help with wider tax services, as well as all other types of disputes and investigations.

UK Tax Disputes Digest (Winter 2026)

Welcome to the Winter 2026 edition of our UK Tax Disputes Digest: a high-level summary of key developments in contentious tax over the last few months for tax and legal in-house professionals.

Tax Controversy 2025 - Chambers and Partners Global Practice Guide

Nicola Hine and Sam Dames offer key perspectives on emerging trends and developments in tax disputes and recent HMRC guidance. With the right strategy, tax challenges can unlock new possibilities.

Explore more

Tax under scrutiny: HMRC disputes and pressure points

06 Mar 2026 1 min read

CMS Annual Tax Conference 2025

26 Mar 2025

UK Tax Disputes Digest

30 Nov 2022 2 min read

UK Tax Disputes Digest

22 Aug 2022 1 min read

Tax Risk Evaluation and Mitigation Schemes

25 Oct 2021 3 min read

Tax-related (Commercial) Disputes

25 Oct 2021 3 min read

Voluntary Tax Disclosures and Penalty Mitigation

25 Oct 2021 4 min read

Tax Offences and Serious Investigations

25 Oct 2021 4 min read

Events

  • United Kingdom
    13 May 2026

    2026 ITechLaw World Technology Law Conference in Chicago

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    21 May 2026

    Navigating Global Uncertainty: Practical Insights for In-House Teams

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    28 May 2026

    CMS International Crypto Forum 2026

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    03 Jun 2026

    IP Insights webinar series 2026

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    08 Jun 2026

    Skills for Future Facing Teams: Presenting as a Leader

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    09 Jun 2026

    CMS Consumer & Retail Conference 2026

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    09 Jun 2026

    UPC Case Law webinar series 2026

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    11 Jun 2026

    Class actions in Scotland: Will Scotland become a litigation hotspot?

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    18 Jun 2026

    Cross-Border Financial Services 2026 webinar series

  • United Kingdom
    22 Jun 2026

    Skills for Future Facing Teams: The Leader Who Advocates Legal Value

  • United Kingdom
    30 Jun 2026

    On the Pulse webinar series 2026 - Spring/Summer

  • United Kingdom
    06 Jul 2026

    CMS Skills For Future Facing Teams: The empowering leader

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