George Gillham | Fieldfisher
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Professional background

Professional background

I am a Partner specialising in helping clients resolve complicated issues in relation to both direct and indirect tax disputes. I am aided in my ability to do so by the fact that I am a former fast stream civil servant, Inland Revenue tax inspector, and policy adviser on corporation tax. I am also a CEDR accredited mediator.

I advise companies on disclosures to, and disputes with, HMRC, around employer taxes, excise duties, capital allowances, cross border tax restrictions, serious compliance failures, and so on. I also advise (on an emergency basis) companies who find themselves subjected to dawn raids by HMRC.

I advise HNW and professional individuals, such as lawyers, bankers and accountants, who are either subject to or caught up in civil enquiries, or COP 8, COP 9 and criminal investigations by HMRC, including advising at interviews under caution. 

I also advise on tax-related judicial review claims and on professional negligence claims against independent financial advisers, accountants and law firms. 

The vast majority of matters in which I am engaged are settled without recourse to tribunals or courts, mediation also being an option. I have deep experience of tax litigation from the First-tier Tax Tribunal through to the Supreme Court and the Court of Justice of the European Union, including a number of very high value group litigation cases. 

The other demands of practice allowing, I write book chapters, articles in the specialist press, and posts on tax-related issues for the Fieldfisher 'Insights' section; and I occasionally present in the UK and EU on cross border tax issues and on complex tax litigation.

Awards & recognition

Awards & recognition

Chambers and Partners 2024
He really cares about his cases and he has incredibly strong tax knowledge.
Legal 500 2023
George Gillham is a stand-out tax lawyer: hugely knowledgeable, wonderful client manner, and a strong strategic sense of how to resolve disputes.

Authored pieces

All Resources
Group of five business people in a modern office with large windows. They are having a discussion around a table, with one person standing and holding papers, another gesturing with a pen, and the rest seated. The room is filled with natural light.
Tax & Structuring
Insight

HMRC criminal investigation statistics: an update for 2024/25

11.02.2026
Since 2013, Fieldfisher has obtained and tracked key statistics on HMRC's criminal investigations. The annual figures show trends in HMRC's criminal enforcement activities. The trend is a drop in HMRC raids against last year, but an increase in decisions to prosecute. This article tracks the data and discusses the latest trends and what they might mean.
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A low-angle view of modern office buildings with reflective glass and metal facades, rising towards a bright sky. The sun is shining brightly, creating lens flare effects on the buildings. The architectural structures are sleek and contemporary.
Insight

Dawn Raids – Guidelines for Managing an Unannounced External Investigation

28.03.2024
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A cityscape featuring modern buildings and a river is overlaid with numbers and mathematical symbols. The image has a purple and blue color scheme, creating a futuristic, data-driven atmosphere.
Insight

HMRC criminal investigations in 2022/23: An update

07.12.2023
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A glass conference table is set with clipboards, pens, and papers. Red chairs are arranged around the table in the background, with a soft focus on the modern, light-filled space. The overall tone of the image is cool, with blue and purple hues.
Employee ownership
Press Release

International employee ownership policymakers convene at Fieldfisher's London HQ

20.11.2023
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Insight

HMRC's Annual Report – Observations on Tax Disputes in 2023

24.07.2023
HMRC's Annual Report and Accounts for 2022/23 reveal some interesting trends in contentious tax and possible options for taxpayers facing disputes.
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What others say…

Chambers and Partners 2024
He really cares about his cases and he has incredibly strong tax knowledge.
Legal 500 2023
George Gillham is a stand-out tax lawyer: hugely knowledgeable, wonderful client manner, and a strong strategic sense of how to resolve disputes.