Department profile
Old Square Tax Chambers

Tax: Private Client

High Net Worth Guide 2026 : London (Bar)


Old Square Tax Chambers

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Chambers Review

Provided by Chambers

Tax: Private Client - London (Bar)

Band 2

Band 2


What the Team is Known For

Old Square Tax Chambers' barristers have expertise in direct and indirect tax matters, and several of its members have strong private client tax practices. Several Old Square Tax Chambers barristers have expertise in residence and domicile issues as well as offshore trusts and foreign tax compliance. Solicitors praise its members' "technical excellence".

Strengths

The clerks at Old Square were helpful, responsive and easy to deal with.

Old Square Tax Chambers has real strength in depth with a number of the biggest names in the business.

Notable practitioners
James Kessler
James Kessler KC is particularly well known for work on domicile and residency issues. Kessler is a specialist in offshore tax matters.

James Kessler spots very good points and very useful points that require a really keen eye for detail and encyclopaedic knowledge of all relevant materials.

James Kessler is a real force and leader at the forefront of private client work.

James Kessler is a leading tax barrister in the UK giving tax advice on transactions. He is very able and really has great intellectual calibre. He is a pleasure to deal with, turns around instructions quickly, and goes above and beyond if he can think of an alternative solution.


Rory Mullan

Rory Mullan KC is respected for his tax expertise. Mullan has expertise in the taxation of non-domiciles and non-residents, and in offshore structures.

Rory Mullan is an expert combining tax knowledge with judicial review and human rights expertise. His input is extremely helpful, aiding us to regularly succeed in cases. He is doing sterling work in a specialist area.

Rory Mullan is an excellent opponent. He's very good at technical tax law and is very charming.

Rory is sensible and measured, a good adviser and litigator, with good all-round legal knowledge.

Rory is incredibly user-friendly, very pragmatic and extremely experienced.


Robert Venables KC
Robert Venables KC is a highly experienced tax silk with a broad practice. He is particularly expert on IHT planning, offshore tax and related issues.

Robert Venables is historically and technically brilliant, and is a good technical lawyer and tax adviser.

Robert Venables is incredibly clever.


Harriet Brown

Harriet Brown has a broad tax practice and particular expertise in offshore tax issues. Brown is dual-qualified as a Jersey Advocate and regularly acts for UK non-domiciles on tax matters.


Mary Ashley

Mary Ashley is noted for her deep expertise in tax matters. Ashley advises on pensions tax and other private client tax matters, including international tax.

Mary Ashley provides clear advice on nuanced topics.

Mary Ashley has been one of the best tax barristers that I have used over a long period of time. She is a brilliant technical lawyer and has a wide base of tax technical ability. Her advice is thorough, clear and practical.


Rebecca Sheldon

Rebecca Sheldon is developing a very strong practice in tax, and has particular expertise in domicile, residence and taxation of trusts issues. Sheldon acts for taxpayers and the Revenue, and has been appointed to the Attorney General's C panel.

Rebecca Sheldon is technically excellent, very approachable and user-friendly.

We received superb support from Rebecca. She is an excellent advocate.


Ross Birkbeck

Ross Birkbeck has a strong tax litigation and advisory practice. Birkbeck handles a range of tax matters including Stamp Duty Land Tax matters, domicile matters and tax appeals.

Ross Birkbeck is a fantastic counsel. He is clever and a master of his brief, as well as being extremely user-friendly both for his solicitor and for clients.

Ross is excellent. He managed our client well, understood the issues quickly and provided clear, helpful advice with a commercial reality.

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Ranked Barristers at Old Square Tax Chambers (14)

London (Bar)

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