William Fry Tax Advisors brings together tax lawyers, accountants and consultants in one highly innovative team. We work with domestic and international corporations, entrepreneurs, family businesses, trusts and high net worth individuals.

We provide the following tax services:

  • Using Ireland as part of a group business strategy
  • Tax due diligence reports
  • Mergers and acquisitions - tax structuring and negotiation
  • Corporate reorganisations
  • Revenue Audit health checks and advice on audits and settlements
  • Transfer pricing reviews and mutual assistance procedures
  • Structured finance including securitisations & financial engineering
  • Indirect Taxation planning and compliance
  • Private client including asset protection & personal tax planning
  • Tax litigation including negotiation, arbitration & settlements
  • Employee benefits and remuneration
  • IP structuring
  • Annual Corporate and Personal Tax Compliance

We work with colleagues in other practice areas and industry sectors, forming multi-disciplinary teams to design and implement creative tax solutions, with particular experience in financial services, retail, technology, communications, construction, leisure & entertainment, personal and trust services.


Contentious TaxWe work closely with clients to resolve contentious tax matters with tax authorities before any court proceedings commence. We provide reviews on tax filing positions taken by taxpayers and legacy tax matters. Please download our Contentious Tax brochure by clicking here or on the image on the left.





William Fry Tax Advisors, is, exclusively, Taxand Ireland. With more than 400 tax partners and over 2,000 advisors in over 40 countries, Taxand is the world’s largest organisation of tax advisors to multinational businesses.


Our experience includes advising:

  • Multinational corporations on using Ireland as part of their global supply chain;
  • Multinational corporations on all compliance aspects;
  • Government and public authorities on public/ private partnership arrangements;
  • Litigation support for both the public and private sector;
  • Multinational and domestic corporations on adopting suitable transfer pricing policies;
  • IPO's and public debt listings across many industry sectors. 


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  • "William Fry's commitment to client service is excellent", says one source, who also praises "their real breadth of knowledge and willingness to allocate the people required when there is a need for a quick turnaround." Another reports that the "technical depth, exposure and experience of the senior team set them apart." Chambers Europe 2018
  • "Sources assert that "from a technical perspective they are clear and direct." Interviewees also value the team's "responsiveness to client needs and commercial awareness." Chambers Europe 2017
  • William Fry’s practice includes Sonya Manzor, who ‘devises well-thought-out tax strategies’ for clients such as King Digital Entertainment. International tax specialist Shane Wallace recently handled various real estate tax structuring and transfer pricing issues. Legal 500 EMEA 2017
  • "The firm is very responsive and has great resources, including access to a global network of tax advisers, which benefits us internationally and is a fantastic asset. The firm's ability to provide both legal and tax advice really ensures everything fits together." Chambers Europe 2016
  • Martin Phelan leads a ‘highly professional’ team at William Fry. It advised the Department of Finance on the potential capital restructuring and sale of its 99% investment in Allied Irish Bank, and also assisted IAG and EirGen Pharma. The group also has a significant private client practice and notable property expertise. . Legal 500 EMEA 2016
  • "The lawyers are technically and commercially the best I have dealt with. I have always been very impressed with their well-thought-out and thorough advice. You can always get through to the partners and their brilliant associates." "This team is fantastic – always available and really responsive." Chambers Europe, 2015
  • "Martin Phelan's controversy practice is at the forefront of domestic contentious tax work and boasts an enviable client list." Who's Who Legal - Corporate Tax 2015 
  • William Fry’s ‘hands-on, straight-talking and practical approach’ finds favour with clients. Legal 500 EMEA, 2015 
  • "One of the most conscientious firms I have dealt with." "The team is knowledgeable and integrates well with other departments, which is very helpful."  Chambers Europe, 2014 
  • Sources say: “What we look for is advice which is quick and to the point, and that's what we get." "The lawyers can handle anything we throw at them.” Chambers Europe, 2013
  • William Fry has ‘comprehensive knowledge of Irish taxation'. Sources say: 'The team is extremely smart and most importantly it is good at recognising a client's objective.' Chambers Europe, 2012


  • Martin Phelan

    • International tax specialist Martin Phelan is described as a "top guy" and "very switched-on." Chambers Europe 2017
    • Leading consultant Martin Phelan is praised for "cutting to the chase" and being "technically very good."  Chambers Global, 2015 
    • Martin Phelan is 'extremely efficient and effective'.  Legal 500 EMEA, 2015
    • Martin Phelan is widely agreed to be one of the leading tax practitioners in Ireland. Clients appreciate that "he has his eye on the ball. He works with you one-on-one and has an ability to react very quickly." Chambers Global, 2014 
    • Team head Martin Phelan is ‘charismatic and very good in commercial negotiation’. Legal 500 EMEA, 2014 
    • Martin Phelan “has a very practical mindset, understands the client's needs very well and offers clever solutions.”  Chambers Global, 2013 
  • Sonya Manzor

    • Sonya Manzor is well renowned for her technical expertise in a broad spectrum of tax matters, including inward investment, corporate reorganisations and M&A transactions. Chambers Europe 2017
    • Sonya Manzor is the firm's most prominent corporate tax lawyer, coming recognised for her "tremendous knowledge and experience. She understands direct and indirect tax in Ireland, the EU and the US. She is instrumental in coming up with creative ideas to get around the problems we face."  Chambers Europe 2016
    • Sonya Manzor is "decisive and proficient, and knows about corporate issues. She also won't back down, but nor will she pick a fight for the sake of it." Chambers Global, 2015
    • Sonya Manzor 'provides creative solutions'. Legal 500 EMEA, 2015 
    • Sonya Manzor "has a very broad depth of knowledge and experience - she is exceptional on corporate transactions." Chambers Europe, 2014
    • Sonya Manzor is ‘excellent on technical matters’. Legal 500 EMEA, 2014 
    • Sonya Manzor has ‘tremendous energy’ and ‘quick understanding’. Legal 500 EMEA, 2013 
    • Sonya Manzor "finds solutions to all sides of an issue and works seamlessly with her corporate colleagues to solve the problem. She also has an incredible work ethic and is always positive and constructive.”  Chambers Global, 2013 
  • Nora Lillis

    • According to Chambers HNW 2017, private client partner Nora Lillis is described as a "formidable operator" and "a go-to person in terms of a name and a recognition that this is a speciality." She advises on trusts and estates, family partnerships, charity law and philanthropy matters, and contested probate and contentious trusts matters.
    • Nora "is very efficient and always on the ball, and gives you straight advice. She isn't afraid to say that she needs to look up an answer - she's a pragmatist, with the ability to say that she'll need to get back to you." Chambers Europe, 2015 
    • Nora Lillis heads the firm's Private Client group. She has a strong reputation for her work in the area, with sources highlighting her work on trusts. Chambers Europe, 2014 
    • Nora Lillis "is efficient, proactive and user-friendly". Chambers Global, 2013 
  • Cliona Donnelly

    • Sources regard Cliona as "very helpful and a knowledgeable person." Chambers Europe 2017
    • She has a growing reputation among market commentators for her tax prowess, with sources stating: "I was amazed at her ability to step in and pick up the work. She did a wonderful job and gave great advice, showing how knowledgeable and experienced she is." Chambers Europe 2016 
    • Cliona Donnelly is 'technically excellent'. Legal 500 EMEA, 2015 
    • Cliona Donnelly is "energetic, creative and good at spotting opportunities," according to clients. She offers expertise in cross-border matters, often involving US law, with particular experience in the tax aspects of international organisations establishing in Ireland.  Chambers Global, 2015 
    • Cliona Donnelly "finds solutions in a hard-working and customer-focused manner." She was part of the team advising Gordon Brothers on the acquisition of Clery's department store. Chambers Global, 2014 

Key Contacts

Martin Phelan Tax Partner with William Fry Tax Advisors Ltd

Sonya Manzor Partner

Brian Duffy Partner

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