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Accounting Firm

Finn & O’ Sullivan

Dublin accountancy and tax practice offering accounts, bookkeeping, payroll and business start-up support

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About Finn & O’ Sullivan

Accountancy and tax work for Dublin businesses

In Dublin, Finn & O'Sullivan works as an accountancy and tax practice. The firm describes itself as certified public accountants and chartered tax advisers. Its website dates the firm to 1999 and says it acts for a wide range of business types. The partnership passed to a single owner in 2005, and the practice says it offers the usual audit, accountancy and tax services with an efficient, hands-on approach in which the partners work closely with clients and staff.

Annual accounts for audit-exempt companies

The firm prepares annual financial statements for audit-exempt companies, which it says comply with company law and the Financial Reporting Standard. It also describes itself as registered auditors and says it can carry out a full statutory audit for any type of business where one is required. The accounts work is set out as a separate service, so a client can take on the statutory reporting without the wider bookkeeping.

Bookkeeping, payroll and accounting systems

The practice provides the bookkeeping, accounting and tax work that clients would expect, and goes further by designing accounting systems. Its system design service includes a monthly procedure summary checklist, which gives a business a fixed routine for keeping its records. The firm says it provides a full payroll service to a large number of clients, can email payslips to employees directly, and can arrange direct payment of salaries.

Solicitors' accountants reports

The firm prepares Solicitors Accountants Reports and submits them to the Incorporated Law Society. It also advises solicitors on how to comply with the Solicitors' Accounts Regulations, the rules that govern the accounts a solicitors' practice keeps. This is a narrower service than general bookkeeping, and the firm presents it as its own line of work for legal clients.

Company formation for start-ups

The firm says it has been involved in many of its clients' start-ups, arranging company formations and registration for all the taxes that apply. Its compliance reporting covers the filings and tax registrations a business has to make, and it helps clients respond to new developments and identify growth opportunities as their businesses mature.

Advice on finance and systems

The firm says it shapes its service to each client's needs, so that the systems it helps set up are useful to management. Those systems are meant to support marketing and budgeting, and to help businesses deal with financial institutions, whether in an annual review of existing finance facilities or in a new application for finance. The stated approach is to keep clients compliant with accountancy standards and tax legislation while improving the way the business keeps its own records.

TrustList summary

Finn & O'Sullivan is a firm of certified public accountants and chartered tax advisers in Dublin. It was formed in 1999 and acts for many kinds of business, with a hands-on approach.

What Finn & O'Sullivan offers

  • Accounts preparation: annual financial statements for audit-exempt companies, in line with company law.
  • Bookkeeping and payroll: regular record keeping and pay processing.
  • Compliance reporting: filings and tax registrations.
  • Accounting system design: including a monthly procedure checklist.
  • Solicitors accounts reports: reports for the Law Society and advice on the accounts regulations.
  • Business start-ups: company formation and registration for relevant taxes.

Who it serves

A wide mix of business types. The firm adapts its work to each client and helps systems support budgeting, marketing and dealings with lenders.

Key facts

  • Based in: Dublin, Ireland
  • Founded: 1999
  • Qualifications: CPA and chartered tax adviser

Summary written by TrustList from the business's own published information, Nov 2026.

Categories & features

Finn & O’ Sullivan rankings

Finn & O’ Sullivan is ranked on 6 TrustList rankings: #13 on 1, #14 on 1, #25 on 2, #31 on 1 and #35 on 1.

Every ranking orders its listings by their reviews, how complete the profile is and the Trust Score. Finn & O’ Sullivan has no reviews yet and 3 of the 10 profile details we look for. Where no listing on a page has been reviewed, the order follows the profiles alone.

Accounting firm · 6 rankings

  • #13of 58
    Dublin

    It is the only one of the 58 here listing SME and one of 3 here listing budgeting.

    Its profile: “In Dublin, Finn & O'Sullivan works as an accountancy and tax practice.”

    Of the 58 here, 35 also cover accounting and 32 also cover tax; 3 also work in Reading and 2 also work in Manchester.

    Behind Farrell Accounting.

  • #14of 75
    Ireland

    It is one of 3 here listing web design and one of 5 here listing partnership.

    Its profile: “- Based in: Dublin, Ireland - Founded: 1999 - Qualifications: CPA and chartered tax adviser Dublin accountancy and tax practice offering accounts, bookkeeping, payroll and business start-up support”

    Of the top 58 here, 8 also cover legal and 6 also cover cloud; 27 also work in Dublin and 2 also work in Europe.

    Behind Farrell Accounting, ahead of Gilligan Black Recruitment.

  • #25of 47
    Budgeting

    It is one of 52 here listing tax and one of 53 here listing accounting.

    Its profile: “Those systems are meant to support marketing and budgeting, and to help businesses deal with financial institutions, whether in an annual review of existing finance facilities or in a new application for finance.”

    Of the 47 here, 14 also cover books and 11 also cover goals; 4 also work in Sydney and 4 also work in California.

    Behind Finance Services, ahead of Finnection Inc..

  • #25of 47
    Web design

    It is one of 2 here listing budgeting and one of 3 here listing SME.

    Of the 47 here, 6 also cover government and 5 also cover real estate; 2 also work in New York and 2 also work in York.

    Behind Fellow CPA, ahead of Flynn + Sweeney.

  • #31of 54
    Design

    It is one of 2 here listing partnership and one of 3 here listing SME.

    Its profile: “Its system design service includes a monthly procedure summary checklist, which gives a business a fixed routine for keeping its records.”

    Of the 54 here, 10 also cover simple and 9 also cover business services; 4 also work in Nice and 3 also work in United States.

    Behind FG accounting, ahead of Global Property Services.

  • #35of 95
    Partnership

    It is the only one of the top 78 here listing budgeting and one of 3 here listing SME.

    Its profile: “The partnership passed to a single owner in 2005, and the practice says it offers the usual audit, accountancy and tax services with an efficient, hands-on approach in which the partners work closely with clients and staff.”

    Of the top 78 here, 10 also cover partners and 9 also cover security; 3 also work in Wales and 2 also work in London.

    Behind Farr Accounting, ahead of Flannagans Chartered Certified Accountants.

As of 2026-11-14. Organic ranks only; sponsored placements are never ranks. How TrustList ranks

What the business tells TrustList

Founded
1999 (27 years) evidence sent

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