Company lists · Data refreshed September 2026

Top 25 Accounting and tax outsourcing companies based in Ireland

Name: Accounting and tax outsourcing companies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 302 companies tracked

RevenueBase identified 302 accounting and tax outsourcing companies headquartered in Ireland as of September 2026 and tracks 5,286 professional contacts across them, including 2,054 with verified work emails and 151 with mobile numbers. Dublin is the largest hub.

This list covers accounting and tax outsourcing companies headquartered in Ireland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

302Companies

5,286Contacts tracked

2,054Verified emails

151Mobile numbers

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The 25 largest accounting and tax outsourcing companies based in Ireland

Ranked by team size

Top 25 of 302 accounting and tax outsourcing companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to accounting and tax outsourcing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 22, 2026
2	Axon Outsourcing Limited	Strong evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	120 contacts →
	Strong evidence “Axon Outsourcing is an ISO 9001:2015 and ISO 27001:2013 Certified Company, GDPR compliant, ACCA approved employer and as a dedicated supplier of accounting services to accounting…” Source: RevenueBase Database · checked Sep 22, 2026
3	FMB Chartered Accountants	Indirect evidence	Dublin 7, IrelandHQ checked Sep 22, 2026	11-50	112 contacts →
	Indirect evidence “Welcome to FMB Chartered Accountants.” Source: RevenueBase Database · checked Sep 22, 2026
4	Fenero TAX & Accounting Solutions	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	99 contacts →
	Partial evidence “Fenero are multi-award winning experts in Contracting and Personal Tax Solutions for contractors, freelancers, company owners and solopreneurs.” Source: RevenueBase Database · checked Sep 22, 2026
5	OSK	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	78 contacts →
	Indirect evidence “OSK have been providing quality and professional business advice to Irish businesses since 1985.” Source: RevenueBase Database · checked Sep 22, 2026
6	Strata Financial	Strong evidence	Dublin 2, IrelandHQ checked Sep 22, 2026	51-200	74 contacts →
	Strong evidence “Strata Financial provides a full suite of all accounting, auditing, tax, management, and compliance services.” Source: RevenueBase Database · checked Sep 22, 2026
7	HLB Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	70 contacts →
	Indirect evidence “HLB Ireland provide quality accountancy services and business advice to entrepreneurial and owner managed businesses.” Source: RevenueBase Database · checked Sep 22, 2026
8	Taxassist Accountants Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	62 contacts →
	Indirect evidence “TaxAssist Accountants offers an accountancy service that reflects the way we all work today.” Source: RevenueBase Database · checked Sep 22, 2026
9	Kinore, Finance & Business Services	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	61 contacts →
	Partial evidence “Kinore is a multi-award-winning chartered accountancy firm offering accounting, bookkeeping, payroll, and company secretarial services.” Source: RevenueBase Database · checked Sep 22, 2026
10	CSG	Indirect evidence	Tralee, IrelandHQ checked Sep 22, 2026	11-50	60 contacts →
	Indirect evidence “Welcome to CSG, a leading accountancy firm in Ireland providing professional services to businesses of all sizes.” Source: RevenueBase Database · checked Sep 22, 2026
11	Retail Financial Solutions RFS	Indirect evidence	Cork, IrelandHQ checked Sep 22, 2026	11-50	43 contacts →
	Indirect evidence “Retail Financial Solutions (RFS) is an Irish owned company that provides best-in-class complete financial solutions for retail clients, resulting in increased margins and cost…” Source: RevenueBase Database · checked Sep 22, 2026
12	Noone Casey	Indirect evidence	Dublin 2, IrelandHQ checked Sep 22, 2026	11-50	42 contacts →
	Indirect evidence “Noone Casey is a Dublin based Accountancy & Advisory firm.” Source: RevenueBase Database · checked Sep 22, 2026
13	Gilroy Gannon Chartered Accountants	Partial evidence	Sligo, IrelandHQ checked Sep 22, 2026	51-200	41 contacts →
	Partial evidence “Gilroy Gannon brings to its clients a unique partnership - people drawn together from the major international accounting firms, industry and small practice with the common goal of…” Source: RevenueBase Database · checked Sep 22, 2026
14	Malone & CO	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	40 contacts →
	Indirect evidence “At Malone & Co, we go beyond the numbers.” Source: RevenueBase Database · checked Sep 22, 2026
15	MBSL	Partial evidence	Dundrum, IrelandHQ checked Sep 22, 2026	11-50	34 contacts →
	Partial evidence “MBSL is a firm of chartered accountants specialising in outsourced accounting.” Source: RevenueBase Database · checked Sep 22, 2026
16	Merry Mullen	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	22 contacts →
	Partial evidence “Medium Practice of the Year - Irish Accountancy Awards 2025 Merry Mullen are a full-service Firm of Chartered Accountant and Chartered Tax Advisers (CTA) based in Dublin 2.” Source: RevenueBase Database · checked Sep 22, 2026
17	INTAX	Partial evidence	Sandyford, IrelandHQ checked Sep 22, 2026	11-50	21 contacts →
	Partial evidence “Intax is award-winning for the best corporate service accountancy firm -Dublin (2021) and tailor accounting, taxation and corporate services to suit companies of all sizes.” Source: RevenueBase Database · checked Sep 22, 2026
18	Deacy Gilligan Ltd. Chartered Accountants	Indirect evidence	Galway, IrelandHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “The goal of DEACY GILLIGAN LTD is to provide quality professional services of the highest standard.” Source: RevenueBase Database · checked Sep 22, 2026
19	Nexus Chartered Accounts & TAX Advisors	Indirect evidence	Blackrock, IrelandHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “Our high standards, efficiency and understanding of compliance, ensure true piece of mind.” Source: RevenueBase Database · checked Sep 22, 2026
20	AMQ Accountants & Auditors AMQ	Indirect evidence	Ennis, IrelandHQ checked Sep 22, 2026	11-50	17 contacts →
	Indirect evidence “AMQ is a multidisciplinary firm of Accountants, Registered Auditors and Business Consultants.” Source: RevenueBase Database · checked Sep 22, 2026
21	TGS Ireland - GBW	Indirect evidence	Ranelagh, IrelandHQ checked Sep 22, 2026	11-50	17 contacts →
	Indirect evidence “TGS Ireland GBW provides Professional Services to Small and Mediun Sized Businesses.” Source: RevenueBase Database · checked Sep 22, 2026
22	Finance Services	Partial evidence	Co Dublin, IrelandHQ checked Sep 22, 2026	11-50	17 contacts →
	Partial evidence “Finance Services provides a diverse range of outsourced services to clients across four core aspects of the finance function- Accounting and Bookkeeping, Payroll, Credit Control…” Source: RevenueBase Database · checked Sep 22, 2026
23	Leahy O'riordan Chartered Accountants Limited	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	16 contacts →
	Partial evidence “Leahy O'Riordan Chartered Accountants, established in 1986, is a leading accountancy firm in Dublin, providing a comprehensive range of accountancy and tax services, as well as…” Source: RevenueBase Database · checked Sep 22, 2026
24	Lewis & CO Chartered Accountants	Partial evidence	Blackrock, IrelandHQ checked Sep 22, 2026	1-10	15 contacts →
	Partial evidence “Chartered accountants, auditors and tax consultants” Source: RevenueBase Database · checked Sep 22, 2026
25	Incorpro	Indirect evidence	Athlone, IrelandHQ checked Sep 22, 2026	1-10	14 contacts →
	Indirect evidence “Incorpro Limited is your trusted Chartered Accountancy, specialising in uplifting small and medium-sized enterprises (SMEs) across Ireland.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: accounting and tax outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names accounting and tax outsourcing companies.
Partial evidence: Its own public description names part of accounting and tax outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting and tax outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 302 accounting and tax outsourcing companies based in Ireland

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Accounting and tax outsourcing companies based in Ireland at a glance

As of Sep 22, 2026

38.9%Verified-email coverage

2.9%Mobile-number coverage

17.5Average contacts per company

1-10Median size (employees)

16.6%Largest-city concentration · Dublin

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

217

11-50

51-200

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 24.0d

1,5880–30

43631–60

2461–90

090–180

6180+

Company record updated

Median 77.0d

00–30

1,35431–60

2,32961–90

1,24090–180

363180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among accounting and tax outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ireland whose own description of what they do matches “accounting and tax outsourcing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names accounting and tax outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among accounting and tax outsourcing companies, and records with no verified work email. Companies headquartered outside Ireland are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 2,054 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Accounting and tax outsourcing companies by metro

Accounting and tax outsourcing companies in Dublin50

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names accounting and tax outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many accounting and tax outsourcing companies are there based in Ireland?

RevenueBase identified 302 accounting and tax outsourcing companies headquartered in Ireland as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Grant Thornton Ireland, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most accounting and tax outsourcing companies?

Dublin leads with 50 headquartered companies, followed by Cork (15) and Galway (11).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,054 verified decision-maker contacts tracked across these 302 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.