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Sub practice

Tax Litigation and Investigations

In the increasingly complex and international area of tax legislation and practice, Allen & Overy’s global team of experts supports businesses in the full range of high-end cross-border disputes and investigations.

Our advice on all aspects of corporate, commercial, VAT and finance tax is designed to avoid disputes, but we are ideally placed to provide support when, or even after, various issues with revenue authorities arise. 

A&O advises a broad range of clients on tax compliance and tax-related disputes and investigations, with particular experience of advising financial institutions. We handle litigation before national and international courts and specialist tax tribunals, including Corporation Tax and VAT disputes, and we liaise with tax authorities and advise on all issues associated with enforcement proceedings.

What sets us apart is our deep experience in handling cross-border transactions, with tax teams in our international offices enjoying strong relationships with local revenue authorities to support the smooth resolution of disputes for the benefit of all parties. 

News and insights

offshore wind farm

News: 24 March 2023

Allen & Overy advises consortium on investing in 960 MW offshore wind farm "He Dreiht"

Allen & Overy has advised a consortium of infrastructure investors consisting of Allianz Capital Partners, AIP Management and Norges Bank Investment Management on the acquisition of a 49.9% stake in…

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Birds eye view of a forest

Publications: 21 March 2023

ESG x Tax in the UK Spring Budget 2023

Across the world, governments are increasingly focusing on using tax measures to address ESG issues. In the UK, whilst it may not have been front and centre of the Chancellor’s speech on Budget Day,…

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Publications: 17 March 2023

States have unlimited capacity: Law Debenture v Ukraine

Foreign states formally recognised by the UK government have unlimited capacity, the UK Supreme Court has confirmed, in a significant decision in long running litigation between a trustee for…

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Hand on keyboard

Blog Post: 20 September 2021

Common mistakes in eDiscovery and how to avoid them

eDiscovery mistakes made during an investigation can add unnecessary delay, cost and, at worst, impact the quality and nature of evidence available.  With the right knowledge and planning, these…

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