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Welcome to Taxkey

Taxkey is a specialised tax advisory practice providing practical solutions to Irish SMEs and their owners. We work closely with accountants, solicitors and financial advisors to ensure that all clients receive a holistic and seamless solution for the business and personal financial goals.

In addition, Taxkey advises businesses based outside of Ireland on the tax implications of relocating commercial activities to Ireland. We also have significant experience advising individuals living outside of Ireland and who are subject to Irish tax on their income and gains.

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What type of client are you?

Accountancy Firms

Taxkey is dedicated to proving accountants with a practical tax support service.

Legal Firms

We work closely with legal firms who need specialist tax advice.

Financial Advisors

We work closely with Financial Advisers who are engaged in wealth planning for their clients.

Irish SMEs and their owners

We deliver practical and proactive tax planning strategies for Irish businesses and their owners

Companies operating in Ireland and abroad

We provide expert Irish tax advice for businesses with operations in Ireland and abroad.

Individuals taxed in Ireland and abroad

We provide expert Irish tax advice for individuals who are taxed in Ireland and other jurisdictions.


I have engaged the services of Taxkey for a number of years as an external tax consultant to our small accountancy firm. Mairead is very professional, personable & a pleasure to deal with. Her technical expertise on complex tax issues is second to none. Whether undertaking a specific body of work or offering a second opinion, her advice has always been very thorough, accurate & always provided in a timely manner. I would have no hesitation in recommending the services of Taxkey.

Juanita Mahon Juanita Mahon Accountancy & Tax

We engaged the services of Taxkey to guide us through tax planning as well as a VAT review and guidance, for our company, now 20 years in business. It has proved to be very timely and well worth investment and we would highly recommend Mairead Hennessy. We found her to be an excellent business consultant, her breadth of knowledge in relation to the subject, left us in no doubt that we were in good hands and felt confident that she would guide us through the complicated terrain. She did a thorough job of listening well, gathering the information from us and then responding with a thorough and in-depth analysis for us to review. Coupled with her expertise, we found Mairead to be very personable, a clear communicator, both in her reports and in person, and she went to great lengths to make all of the information accessible to the lay person. She addressed all of our issues and any further questions that we had arising out of the consultation. I recommend Mairead without hesitation.

Maria Sheanon Roche Martin

We consult with Taxkey when we come across a tax issue that is outside the scope of our in-house expertise, or when we want a second opinion about a technical tax issue. We have always found Mairéad’s advice to be concise, accurate, to the point and provided in a timely and cost-efficient manner. We highly recommend Mairéad

Declan Long Long Accountants Limited

Kane Bergin & Company used the services of Taxkey on a tricky tax assignment in 2019. We found Mairéad to be very professional, courteous and practical in dealing with us and our client. We would have no hesitation in using Taxkey in the future or recommending their services

Austin Bergin Kane Bergin & Company

Mairéad recently completed a body of work for us relating to VAT on the sale of our company’s commercial property. We found Mairéad to be attentive, practical and capable of guiding us smoothly through the various VAT related complexities of the transaction.

Martin O’Donnell Nuhall Retail Services Limited

We engaged Taxkey to provide tax advice on a company sale. Mairéad is thorough and professional, and throughout the engagement demonstrated excellent knowledge of the tax implications for shareholders. Mairéad provided critical advice and recommendations on the structure of the company sale and legal agreements documenting the sale, along with guidance on completing the relevant tax returns.

Two Irish Shareholders

As a Sole Practitioner the services of Taxkey have given me the exact reassurance I require in relation to any tax issue. Mairead is always quick to respond and her advice is always excellently measured with all Tax-Heads for any issue given thorough consideration.

Ger Kirwan GK Accounts

Mairead Hennessy is a super accountant. Smart, professional and a pleasure to deal with. I would highly recommend Mairead to anyone looking for an accountant.

Luke Hanahoe Hanahoe & Hanahoe Solicitors

I was introduced to TaxKey by my own accountant when I had a particularly difficult situation that needed immediate attention. Mairead and her team really ‘stepped up to the plate’ and not only concurred with the opinion, but offered a slightly differing view which, when taken into account reduced the final tax due even more. I am more than happy to recommend TaxKey, as I have done in the past. Her exposure and experience and value for money is second to none!

Declan Kennedy Reiken & Associates

I recently sold an Irish property whilst living abroad and had many years worth of tax returns which needed to be submitted to revenue. It was an extremely overwhelming and stressful situation to be in which was made much easier after acquiring Taxkey's services and dealing directly with Mairead throughout the whole process. I would highly recommend Taxkey and thank them for their knowledge, quick response times and professionalism throughout.

Irish individual living abroad

Why Choose Taxkey

Why Choose Taxkey

Timely Support

Client service is at the heart of what we do. We respond to all queries within 24 hours and we will work with you to answer all queries as quickly as possible.

Flexible Service

We are happy to meet you in person or by teleconference depending on your preference.

Expert Advice

Tax is constantly changing. At Taxkey, we stay up to date with tax law and practice to ensure you are getting the best advice possible.

Transparent Fee Structure

At Taxkey, we pride ourselves on our communication skills. Our fees structure is transparent and we are always happy to provide a quotation in advance of starting a piece of work.

Knowledge Centre

Read our tax articles and practical case studies

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