William Sweeney - CTA, ATT

R&D Tax Senior Manager

William Sweeney - Menzies Accountant


As a member of Menzies’ specialist Innovation and R&D team,  I specialise in helping entrepreneurial corporate clients and owner managed businesses to optimise their tax affairs, regularly advising on issues such as R&D claims, the Patent Box and creative sector reliefs. I am grateful that my role enables me to work with some of the most interesting and ambitious businesses in the UK and am passionate about ensuring these businesses benefit from the significant tax advantages they are entitled to under the UK’s innovative tax reliefs.

I have been providing specialist advice to innovative companies on their tax affairs for over ten years, joining Menzies in 2015. Throughout this time, I have found my previous career as an Engineer provides me with valuable insight and technical understanding to work with clients in applying the tax rules to their own work.

I am a Chartered Tax Advisor and a member of the Association of Taxation Technicians, qualifying as a prize-winner in the Association’s 2011 exams.


My first job
Working for a temp agency, packing cat litter into 5kg sacks.

Alternative career choice
Mechanical Engineering. I still get very enthusiastic when discussing innovative new designs with my clients.

My favourite hobby
Running in the hills and mountains around the UK.