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 Its 2025 return — covering 1 January to 31 December 2025 — will be assessed under the repealed laws.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.
