Ask how long a tax clearance certificate takes and most answers are vague: "it depends on the Nigeria Revenue Service (NRS), formerly FIRS". The law is actually specific about the last stretch of that wait.
The Nigeria Tax Administration Act 2025 sets a real number of days, not just a general expectation.
The two-week rule in the law
Once your file is in order, the tax authority has two weeks from the request to issue the certificate. This comes from section 72(1) of the Nigeria Tax Administration Act 2025, and it applies to the NRS at federal level and to state revenue services for their own certificates.
That is a legal deadline, not an estimate from a filing guide. It gives you something concrete to point to if a request seems to be sitting untouched.
What actually starts the clock
The two weeks does not start the moment you submit a form. It starts once the authority is satisfied that the tax assessed for the covered years has been paid, or that none was due.
In practice, that means the clock waits for the slow part: confirming your returns, checking the assessment and clearing any balance. Once that confirmation happens, the fast part is meant to follow quickly.
This is also why two different companies can apply on the same day and get very different waits. The one with a clean, already-assessed file starts its two weeks almost immediately. The one with a gap does not start it at all until the gap is closed.
The three years behind that confirmation
Before the clock can start, the authority is checking the three years of assessment before the current year, exactly the period a TCC reports on. There is no shortcut around this: the statutory two weeks sits on the far side of that three-year check, not instead of it.
If you want to know what has to be true before you even reach this stage, our checklist of documents for a TCC application sets that out in full.
Why real applications still stretch past two weeks
The law does not promise every certificate in two weeks flat. It promises two weeks once the file is confirmed clean, and confirming that can itself take time if a return needs re-checking or an assessment is under query.
Because the two weeks cannot start until the file is confirmed clean, a slow certificate usually points to one of the readiness gaps this article has covered, not the statutory window itself.
What to do once two weeks have passed with nothing back
If your file was genuinely clean and confirmed, and two weeks have passed with no certificate, that is worth raising directly with the tax office handling your file rather than waiting further. Keep a record of when your file was confirmed clean, since that is the date the statutory window actually runs from.
For the full cost and timeline picture beyond this one rule, see the tax clearance certificate cost and timeline guide. You can start an application on the tax clearance certificate page, and our other NRS tax guides cover the Rev360 side of filing.