Cian O'Sullivan

Tax Partner

Cian is a Partner with William Fry Tax Advisors.

Cian O'Sullivan

Cian is a tax partner with over 15 years’ experience advising clients on corporate tax matters across a wide range of industry sectors, including retailers, construction and service sector companies.

He provides both domestic and international tax advice with a focus on planning strategies, including corporate restructures and property transactions.

Cian is a Fellow of the Institute of Chartered Accountants in Ireland and is also a Chartered Tax Adviser with the Irish Tax Institute.

Practice Areas

Tax 
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Article and Insights

Budget 2026

The first Budget of this Government's term is described by the Minister as an investment in our future while securing the jobs, prosperity and stab...

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Tax Partner
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Budget 2025

Budget 2025 has been billed by the media as a pre-election budget as the Minister announced a range of tax cuts and expenditure measures worth €10....

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Tax Partner
Sonya Manzor
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Article and Insights

William Fry Hires New Tax Partner

William Fry is delighted to announce that Colin Bolger has joined as a Partner in the firm's tax department.

Colin Bolger
Tax Partner
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Budget 2024

Budget 2024 has been billed by the media as a pre-election budget as the Minister announced a range of tax cuts and expenditure measures worth €14bn.

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Tax Partner
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Article and Insights

Digital Gaming Credit

A new tax credit for digital games development has come into effect on 16 November 2022.

Sonya Manzor
Tax Partner
Sonya Manzor
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Budget 2023

Budget 2023 was announced on 27 September 2022

Sonya Manzor
Tax Partner
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Article and Insights

Revenue’s Annual Report 2021

In May 2022, Revenue published its annual report for 2021. The Report reviews how Revenue is performing against the backdrop of a changing trading ...

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Tax Partner
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Article and Insights

What You Need to Know About the New Code of Practice for Revenue Compliance Interventions

A new Code of Practice for Revenue Compliance Interventions was recently published. From 1 May 2022, the Code of Practice will significantly change...

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Tax Partner
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Article and Insights

Summary of Irish and International Tax Measures in Response to COVID-19 & Future Developments

Summary of Irish and international tax measures in response to COVID-19 & future developments.

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Tax Partner
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Report

Taxand: Strong M&A activity forecast for H2 after fast start to 2021

Taxand’s 2021 Guide provides commentary and insights into the tax treatment of global M&A deals.

Sonya Manzor
Tax Partner
Sonya Manzor