10 Best Auditing & Tax Firms in Nigeria

16 Sep 2025

Auditing & tax firms in Nigeria play a critical role in ensuring transparency, accountability, and compliance within the corporate sector. Audit services ensure that financial statements are true, fair, and compliant with International Financial Reporting Standards (IFRS). They also help in internal control evaluation, forensic reviews, and risk assurance. Tax services cover corporate tax filing, VAT compliance, transfer pricing, tax planning, and resolution of disputes with the Federal Inland Revenue Service (FIRS) or state tax authorities. The Nigerian auditing sector is dominated by the Big Four — KPMG, EY, PwC, and Deloitte — which handle most large corporations and listed companies. Their global reach, technical expertise, and credibility make them trusted advisors. However, mid-tier firms like Crowe Dafinone, BDO, Grant Thornton, Nexia, Baker Tilly, and RSM play a vital role, especially for SMEs, indigenous companies, and businesses seeking cost-effective yet reliable services. Professional oversight is provided by the Financial Reporting Council of Nigeria (FRCN) and the Institute of Chartered Accountants of Nigeria (ICAN), ensuring quality and independence. As Nigeria’s economy grows, these firms are increasingly using digital auditing tools, data analytics, and automated tax solutions to improve efficiency and accuracy.