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While people often use the terms interchangeably, an audit and an investigation are very different under the 2026 NRS framework. Knowing which one you are facing is critical for your legal strategy.
Tax Audit: The Routine Check
A tax audit is a routine exercise to ensure compliance. It usually covers the ‘open years’ (the last 6 years) and aims to collect the correct tax. If the NRS finds an error, you pay the tax plus a 10% penalty. See The Audit Process for more.
Tax Investigation: The Deep Dive
An investigation is triggered when the NRS suspects fraud, willful default, or neglect. Unlike an audit:
- It can go back beyond 6 years (no time limit for fraud).
- It often involves the ‘Enforcement Unit’ rather than just audit officers.
- It can lead to criminal prosecution and up to 3 years imprisonment.
If you are under investigation, you should immediately read about how to appeal an assessment and hire a tax attorney. For official distinctions, see the NRS Charter or Deloitte Nigeria.”