O'Brien & Co. Certified Public Accountants

What O'Brien & Co. Certified Public Accountants does

O'Brien & Co. Certified Public Accountants is a small, founder-led accounting practice established in 2001 by Tom O'Brien in Blackrock, Dublin, Ireland. The firm is registered as Certified Public Accountants and Registered Auditors under the Institute of Certified Public Accountants in Ireland (ICP) and operates with 1-10 employees from a single office at 58 Stillorgan Park, Blackrock. Tom O'Brien brought 18 years of prior experience managing back-office operations at an international insurance company to the founding of the practice, giving the firm over 35 years of combined industry experience at the principal level.

The firm delivers a comprehensive suite of traditional professional services including statutory audits, accounts and bookkeeping, taxation (VAT, PAYE, Corporation Tax, Income Tax), Revenue/NERA/Law Society inspection support, Law Society reports, management reporting, company formation and secretarial services, new business start-up advisory, limited partnership accounts, and payroll processing via a computerized payroll system. Its service mix targets small to medium owner-managed enterprises across multiple verticals (retail, hospitality, manufacturing, services, legal, not-for-profit, agriculture, medical, insurance, property, IT, construction), with select named clients including ICD Business School, singer-songwriter Declan O'Rourke, and Capel Communications, several of whom have been retained for over two decades.

The business model is fee-for-service professional engagement, with services delivered directly via phone, email, and in-person consultations at the Blackrock office. Client acquisition is primarily referral- and relationship-driven, supplemented by a basic website (obriencpa.ie), social media profiles (Facebook, Twitter, LinkedIn, Google+), and an opt-in newsletter. The firm is entirely bootstrapped, founder-owned, operates as a partnership under Irish law, and has no external institutional investment, no subsidiaries, and no software or technology product components beyond the payroll system.

Name

O'Brien & Co. Certified Public Accountants

Legal name

O'Brien & Co. Certified Public Accountants and Registered Auditors

Website

https://obriencpa.ie

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

1–10 employees

Short description

O'Brien & Co. Certified Public Accountants is a founder-led Dublin-based accounting practice (est. 2001) delivering statutory audits, taxation, bookkeeping, payroll, and business advisory services to small and medium owner-managed enterprises across multiple Irish industries.

Ownership category

akta.pro rank

Product category

Professional Accounting Services

NAICS

Offices of Certified Public Accountants (541211), Accounting, Tax Preparation, Bookkeeping, and Payroll Services (54121), Other Accounting Services (541219)

SIC

Finance Services (6199)

akta.pro primary industry

Financial Reporting & Technical Accounting Advisory (GAAP/IFRS) (BPAHABAF)

Keywords

• Accounting services
• Tax preparation
• Bookkeeping services
• Statutory audits
• Payroll services

Headquarters

HQ city

Blackrock

HQ country

Ireland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Professional Accounting and Auditing Services: The firm generates revenue through professional services fees for accounting, auditing, taxation, payroll, and business management services. Services are billed presumably on a fee basis for ongoing client relationships rather than a per-transaction model.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

O'Brien & Co. is a Dublin-based Certified Public Accountancy and Registered Auditors firm that delivers traditional professional services including accounts preparation, statutory audits, taxation (VAT, PAYE, Corporation Tax, Income Tax), payroll processing, management reporting, company formation and secretarial work, and Law Society reporting for small and medium owner-managed businesses. The firm serves SMEs and not-for-profit entities primarily in the Dublin area through direct office-based engagement.

Product overview

O'Brien & Co. Certified Public Accountants offers a comprehensive suite of accounting and business services delivered as professional service offerings rather than a software product platform. The core portfolio includes Accounts/Bookkeeping, Statutory Audits, Taxation Services (VAT, PAYE, Corporation Tax, Income Tax), Revenue/NERA/Law Society Inspection Support, Law Society Reports, Management Reports, Company Formation & Secretarial Services, New Business Start-Up Advisory, Limited Partnership Accounts, and Payroll Services. All services are provided through traditional professional channels (phone, email, in-person consultations) with no software or technology product components.

Differentiator

Problem solved

Functional benefit

Products and services

• Accounts / Bookkeeping
• Statutory Audits Accountancy and auditing services for SMEs and not-for-profit entities, with a proactive planning approach and quick turnaround.
• Taxation Services Comprehensive tax services including VAT registration and returns, PAYE processing, Corporation Tax (12.5% Irish rate), and Income Tax for directors and sole traders.
• Revenue / NERA / Law Society Inspection Services Assistance during tax authority inspections, including reviewing affairs, making disclosures, and liaising with authorities to reduce penalties or tax interest.
• Law Society Reports Preparation and submission of Law Society reports in accordance with Law Society Regulations. Targets law firms requiring reporting accountant sign-off.
• Management Reports Periodic reports including monthly management accounts, budget reviews, supplier reports, reconciliation, and payroll statistics to guide business decisions.
• Company Formation & Secretarial Services Advisory on company structure, legal requirements, taxation implications, director obligations, and filing obligations. Post-incorporation company secretarial services.
• New Business Start-Up Advisory Guidance on business structure (company, partnership, sole trader), business planning, cash flow forecasting, and capital requirements.
• Limited Partnership Accounts and Tax Returns Partnership accounts preparation, complex PAYE issue handling, capital allowances and losses preparation, and partnership return filing.
• Payroll Services Computerised payroll processing on weekly, fortnightly or monthly basis with P30, P35 submissions, P60s and P45s issuance.

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators2 records

Recent moves4 records

Expansion highlights2 records

Direct peers

• Crowe Ireland: Irish member of Crowe Global, delivering audit, tax, and advisory to SMEs and mid-market clients; comparable service line-up and Dublin presence to O'Brien & Co.
• Grant Thornton Ireland: International accounting network's Irish member firm offering audit, tax, and advisory to mid-market and SME clients in Ireland; comparable in service portfolio and SME focus though operating at materially greater scale.
• Baker Tilly Ireland: Irish accounting and advisory firm focused on SMEs, owner-managed businesses, and not-for-profits; very comparable client base and service mix to O'Brien & Co.
• RSM Ireland: Ireland member of the RSM global accounting network, providing audit, tax, and consulting to owner-managed businesses and SMEs — closely comparable offering and target market.
• BDO Ireland: Mid-tier Irish accounting and audit firm providing statutory audit, tax, and advisory services to SMEs and owner-managed businesses across Dublin and Ireland — directly comparable in service mix and target segment to O'Brien & Co.
• PKF O'Connor, Leddy & Holmes: Irish mid-tier chartered accountancy firm offering audit, tax, and advisory to SMEs and family businesses across Ireland — closely comparable in size, geography, and service mix.
• Mazars Ireland: Top-tier international accounting firm operating in Ireland with audit, tax, payroll, and advisory services for SMEs and mid-market — comparable offerings, larger scale.

Emerging players

• Sage Ireland: Accounting and payroll software provider with strong Irish SME penetration; a substitute for the bookkeeping and payroll services O'Brien & Co. currently bundles, with potential fee-compression impact.
• Xero: Cloud accounting SaaS platform widely adopted by Irish SMEs; competes indirectly by enabling clients to handle bookkeeping in-house, pressuring fees at the bottom of the accounting services stack.

Broad incumbents

• Deloitte Ireland: Big Four firm in Ireland offering audit, tax, consulting, and advisory; serves larger SMEs and corporates rather than owner-managed micro-businesses — broader incumbent with overlapping services.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xtwitter.com/Thomas81466761
• Facebookfb.com/obrienandcompanycpa
• LinkedInie.linkedin.com/pub/thomas-o-brien/25/373/7bb

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about O'Brien & Co. Certified Public Accountants