Top 10 Accounting Firms in Nigeria: Navigating Finance in Africa’s Giant (2025)

In the dynamic core of Africa’s largest economy, Nigeria’s top accounting firms are serving as critical strategic partners, guiding businesses through rapid digitalization, complex tax reforms, and a volatile economic landscape. They are the unsung architects of transparency, compliance, and sustained growth, extending far beyond simple auditing to offer sophisticated advisory, forensic, and ESG services.

As of 2025, the industry is booming, fueled by significant investments in FinTech and anti-corruption measures. This ranking highlights the dominant “Big Four” alongside the leading mid-tier players, based on revenue, client portfolio, service breadth, and market influence.

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The Big Four: Pillars of Nigerian Corporate Finance

These four global giants dominate the auditing landscape, serving nearly all of Nigeria’s largest multinational and publicly listed corporations.

1. PwC Nigeria (PricewaterhouseCoopers)

PwC maintains its position as the undisputed market leader in Nigeria. With over 1,500 professionals across key cities, the firm has been operating locally since 1953.

• Key Services: Dominates Assurance and Tax services.
• Market Edge: Unmatched trust, having audited 99% of top-listed firms. Offers cutting-edge AI-powered risk analytics and sustainability consulting.
• Sector Focus: Giants like Dangote Group and MTN Nigeria.

2. KPMG Nigeria

A fierce rival to PwC, KPMG is essential to the backbone of Nigeria’s energy and financial sectors.

• Key Services: Excels in Advisory for the oil & gas and banking sectors, including forensic audits and deal advisory.
• Market Edge: Heavily focused on digital transformation in 2025, including implementing SAP solutions to accelerate business and ESG reporting for clients.
• Sector Focus: Clients include Zenith Bank and Seplat.

3. Deloitte Nigeria

Globally established in 1924, Deloitte has a strong, long-standing presence in Nigeria, emphasizing advisory and consulting.

• Key Services: Core Audit and Consulting services, with expertise in M&A Advisory and ESG Reporting.
• Market Edge: Known for its innovation hubs in Lagos, which help clients like Unilever navigate challenging issues such as FX volatility.
• Sector Focus: Telecoms and Manufacturing.

4. EY Nigeria (Ernst & Young)

EY rounds out the Big Four, recognized for its comprehensive approach to risk management and robust financial sector ties.

• Key Services: Specializes in Energy Audits and provides strong services in Tax Optimization and Cyber Risk.
• Market Edge: The firm reported over 20% growth in its advisory segment in 2025, driven by its “Building a Better Working World” ethos and deep sector knowledge.
• Sector Focus: Energy (Oando, Mobil) and Financial Services.

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Mid-Tier Champions: Agility and Specialization

These rising firms offer Big Four quality with greater agility, often providing highly specialized services tailored for Small and Medium-sized Enterprises (SMEs) and specific niche sectors.

5. BDO Nigeria

BDO breaks into the top five, providing an ideal bridge for growing businesses.

• Key Services: Personalized Audit, Tax, and Outsourcing services.
• Market Edge: Leveraging its global fifth-largest network to provide Big Four quality at a more accessible rate, specializing in supporting mid-market clients like breweries and retailers.
• Staff Strength: 300+ professionals.

6. Grant Thornton Nigeria

Known for its entrepreneurial focus, Grant Thornton is a key partner for Nigeria’s vibrant startup ecosystem.

• Key Services: Forensic, Restructuring, and Entrepreneurial Advisory.
• Market Edge: Rapidly expanding its focus on FinTech compliance amid CBN regulations, a crucial area for growth.
• Sector Focus: Tech and Agribusiness (e.g., Flutterwave).

7. Baker Tilly Nigeria

As part of a 700-office global network, Baker Tilly excels at cross-border transactions.

• Key Services: International Tax planning and quick-turnaround audits.
• Market Edge: Favored by exporters, NGOs, and scaling startups for its expertise in facilitating cross-border deals.
• Staff Strength: 200 professionals across Abuja and Lagos.

8. RSM Nigeria (RSM Stoneforest)

RSM is a powerhouse in implementing enterprise resource planning (ERP) and cloud solutions.

• Key Services: Audit and ERP Consulting.
• Market Edge: Noted for its cloud-based solutions, driving seamless financial reporting and growing 15% in 2025 through strategic mergers.
• Sector Focus: Manufacturing and Real Estate.

9. Crowe Nigeria

Crowe is rapidly gaining market share through its data-driven approach to performance improvement.

• Key Services: Performance Audits and Forensic Services.
• Market Edge: Delivers data analytics-driven insights to enhance operational efficiency, offering competitive pricing on forensic services.
• Sector Focus: Financial Services and Healthcare.

10. SIAO Nigeria (Nexia Agbo Abel & Co)

SIAO, a member of the international Nexia network, is one of Nigeria’s largest indigenous firms by some measures, focusing on localized expertise.

• Key Services: Boutique Advisory and localized Tax Planning services, including Audit, Accounting, and HR consulting.
• Market Edge: Strong reputation for ethical auditing and deep local market expertise, serving clients in Oil & Gas, Public Sector, and Finance.
• Staff Strength: Over 100 dedicated personnel.

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The Strategic Importance of Nigerian Accounting Firms in 2025

The collective impact of these firms is immense: they audit over 80% of Nigerian Exchange Group (NSE) listed companies, generating fees exceeding ₦20 billion and employing more than 5,000 professionals.

In 2025, their advisory services are vital for navigating key national economic challenges:

• FX Reforms: Guiding multinationals through the impact of Naira volatility.
• Digital Tax Filings: Implementing compliant, technology-driven tax solutions.
• Green Finance: Championing AI audits and adherence to evolving ESG mandates.

For businesses, partnering with one of these leaders ensures compliance confidence and strategic foresight. For aspiring professionals, securing an ICAN-certified role here promises world-class training and global mobility.

Pro Tip: Choose the Big Four for scale, global compliance, and complex deals, or a Mid-Tier firm for personalized service, cost-effectiveness, and agility in the SME space.