Tax reset 2026!

The Federal Government has just handed businesses and taxpayers a long-awaited lifeline: clear transition guidelines for the new Nigeria Tax Acts 2025, which come into force on 1 January 2026. For many business owners who’ve been nervously guessing how the new rules would apply, this is welcome news — the government has said explicitly that the new laws will not be applied retroactively. But clarity on paper does not remove the work ahead. The hard part now is getting systems, people and processes ready.

Here’s the simple bottom line: tax affairs up to 31 December 2025 remain under the old rules; anything arising from 1 January 2026 follows the new framework. That sounds tidy, but in practice it raises a number of common-sense questions for organisations with overlapping accounting periods, ongoing audits or expiring incentives.

Consider a Lagos tech start-up with a December year-end. Its 2025 return — covering 1 January to 31 December 2025 — will be assessed under the repealed laws. A manufacturing company whose financial year runs April–March, however, needs to be careful. Income earned from 1 January 2026 to 31 March 2026 will fall under the new Acts, while the earlier months of that same accounting period remain under the old regime. In short: don’t assume your whole financial year is covered by one law without mapping the dates.

The guidelines also make two other practical points. First, ongoing audits, disputes, and enforcement actions that relate to prior years will continue under the old rules. If you are mid-audit for 2022 or contesting an assessment for 2023, expect that process to finish under the laws that were in force when those years were being examined. Second, existing tax incentives and exemptions in force before the cutoff will run until they expire. But any fresh applications for approvals or incentives submitted after 1 January 2026 will be judged under the new acts — so businesses planning to rely on legacy concessions should track the expiry dates carefully.

There are straightforward actions every business should take now. Start by mapping your accounting and tax periods against the 1 January 2026 cut-off. Reconcile outstanding returns and file anything overdue under the old laws. If you are in the middle of an audit or dispute, gather and preserve all supporting records — those files will still be examined under the old rules. For those who benefit from incentives, make a list of expiry dates and any conditions you must meet to preserve those benefits.

Systems and people upgrades are also essential. Payroll systems that calculate PAYE, employee benefits and statutory deductions may need tweaks; the same goes for accounting software and ERP platforms that prepare corporate tax, VAT or withholding tax returns. Discuss changes with your bank, registrar and tax advisor. In some countries — the UK and South Africa have had comparable legislative overhauls — the smoothest transitions were driven by early coordination between revenue authorities, banks, software vendors and taxpayers. Nigeria will need the same teamwork across the Nigeria Revenue Service and State Internal Revenue Services.

Communication matters. The transition guidelines are only useful if taxpayers and tax administrators interpret them the same way. Expect circulars, FAQs and outreach programmes from the revenue authorities; take advantage of workshops and webinars. Businesses should likewise inform their boards and investors about material impacts to reported revenue, tax liabilities and cash flow, especially where accounting periods straddle the changeover.

Finally, treat the transition as an opportunity, not merely a compliance burden. The new tax framework will bring changes — some will be neutral, others beneficial, and some costly. Use this window to assess tax planning, review incentive eligibility under the new law and strengthen record-keeping. Where possible, model cash flow under the new rules so surprises don’t show up during a quarter-end close or audit.

The transition guidelines remove the greatest fear — retrospective application — but they also place a premium on preparation. Good outcomes will come from clear calendars, tightened records, updated systems and open lines of communication with the tax authorities. The law changes on 1 January 2026; the smart work starts today.

Dr Adeniyi Bamgboye, FCTI, FCA, FCCA, a dual-qualified chartered accountant, tax expert, and policy analyst, is the managing partner of Empyrean Professional Services, an audit, business, and financial advisory firm dedicated to enhancing its clients’ business value. 08060603156. [email protected]