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Dermot O’Brien

I am a VAT specialist and the commencement of my career in VAT predates the arrival of the fax machine. I spent 10 years working in VAT with the Revenue Commissioners, where I gained significant expertise in VAT law and administration but felt that there must be another side to the story.

I further developed my tax expertise in the private sector, working in a number of firms and my roles included heading the Indirect Tax practice in KPMG, before becoming a VAT partner in BDO.

Something was still gnawing at my professional bones when I realised that there was no independent VAT consulting practice in Ireland. Not stopping to consider whether there might be a good reason for this, I established Dermot O’Brien & Associates in 2004. Shortly after establishing the firm, my ex-colleague from BDO, Gabrielle Dillon, came on board and I have been listening ever since. As Gabrielle is from Mayo and I am a noble Dub, we rarely discuss Gaelic Football.

However, VAT consulting is what we were always about and I had some peculiar need to be more immersed in tax and became a Council Member of the Irish Taxation Institute, culminating in being President (2006-2007), a position I feel honoured to have held.

I have written, and co-written, a couple of books on VAT but to borrow a title from The Who, I “Won’t Get Fooled Again”. (For younger readers, The Who also predate the fax machine.)

I have also acted as an expert adviser to the IMF on tax issues, and have conducted missions in a number of rarely-visited Central European and Southern African states. I previously represented the ITI on the VAT Sub-Committee of the Taxes Administration Liaison Committee (TALC).

Gabrielle and I joined Twomey Moran in March 2020.

Contact me


Office: +353 1 660 7000

Mobile: +44 7797 930082



Rugby, cricket, wine and bad golf.


Fellow of the Irish Taxation Institute, Member of the Institute of Directors.


Article of the Year recipient, Irish Tax Review.