FIRS Tax Calendar 2025 — Compliance Deadlines for Nigerian Businesses
A complete guide to every filing deadline, payment schedule, and regulatory obligation for the 2025 fiscal year under FIRS administration.
Read ArticleProfessional Accounting, Audit & Advisory — the trusted professional foundation for Nigerian businesses navigating compliance, risk, and financial governance.
From statutory audit and tax compliance to company secretariat and insolvency — one firm for every stage of your organisation's financial and governance journey.
View All ServicesIndependent audit engagements that satisfy regulatory requirements and build genuine confidence in your financial reporting.
Systematic evaluation of risk, controls, and governance processes — giving leadership clear assurance on operational integrity.
Accurate, timely financial records prepared to IFRS and Nigerian accounting standards — the foundation of every well-run organisation.
Design, review, and strengthening of control frameworks to protect assets, prevent fraud, and ensure procedural compliance.
Enterprise risk assessment and management — identifying, quantifying, and mitigating the financial and operational risks that threaten your business.
Full-spectrum tax services: FIRS filing, LIRS compliance, VAT, CIT, WHT, and strategic tax planning for individuals and corporates.
Structured insolvency proceedings, creditor negotiations, and liquidation management — handled with professional discretion and legal rigour.
Statutory compliance administration, board support, CAC filings, and corporate governance — a premium capability rarely matched by small-tier firms.
Olusola Adekanola & Co was established in 1984 as a dedicated professional services firm serving Nigerian businesses with the highest standards of audit, accounting, and advisory. For more than forty years, we have been the trusted financial conscience of organisations across private, public, and non-governmental sectors.
Our ICAN and ACCA affiliations are not credentials — they are commitments. Commitments to independence, to professional judgment, and to the institutional integrity that every client engagement demands.
Established 1984. One of Nigeria's most enduring professional services firms — a foundational trust signal that no newer practice can replicate.
ICAN and ACCA affiliations. Professional memberships that enforce independence, uphold standards, and ensure every engagement is governed by ethical obligation.
Full lifecycle capability. From incorporation compliance to insolvency proceedings — a single firm that stays with an organisation through every phase.
Company Secretariat. A premium governance capability rarely found in small and mid-tier firms — handling board minutes, CAC filings, and statutory obligations with precision.
Group ecosystem advantage. As a founding member of OA Group, audit findings that surface business improvement opportunities connect directly to advisory, consulting, and financing through sister companies.
From first contact to final report — every engagement follows a disciplined, transparent process that keeps clients informed at every stage.
Initial consultation to define scope, objectives, and deliverables. A formal engagement letter is issued before any work begins.
Thorough examination of financial records, control environments, and compliance status against applicable standards.
Fieldwork, testing, and professional analysis conducted with full independence and in accordance with applicable professional standards.
Clear, actionable report delivered with findings, recommendations, and a management response framework where applicable.
A complete guide to every filing deadline, payment schedule, and regulatory obligation for the 2025 fiscal year under FIRS administration.
Read ArticleStatutory audit thresholds, triggers, and the consequences of non-compliance — a plain-language guide for Nigerian business owners and CFOs.
Read ArticleWhat annual returns are, when they are due, what happens when you miss them, and how a Company Secretariat avoids these exposures entirely.
Read ArticleAudit findings surfacing business improvement opportunities? Our sister company OA Consulting Limited specialises in turning compliance insights into commercial action.
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