When a Lagos tax assessment becomes final
What happens when a Lagos taxpayer neither objects to nor pays an LIRS assessment within 30 days, and how to object properly before the window closes.
By Achekam · · 4 min read · For Running a business businesses in Nigeria
An assessment from the Lagos State Internal Revenue Service (LIRS) arrives. The figure looks high, perhaps because the LIRS has estimated income it never received a return for, or included an amount the business disputes. The owner puts it aside to "deal with properly" when things are quieter. A month passes.
That month is the whole of the time the law gives. In Lagos, an assessment that is neither objected to nor paid within 30 days stops being a figure you can argue with. This article explains how the window works, how to object so that the objection counts, and what happens if you do nothing.
Thirty days to object, on e-Tax, with grounds and evidence
The LIRS FAQs say a taxpayer who disputes an LIRS assessment must file a Notice of Objection on the e-Tax platform within 30 days of receiving the assessment. The notice must state specific grounds and enclose evidence of payment of the undisputed portion.
The national law sets the same frame. Under the Nigeria Tax Administration Act, 2025, a taxable person who disputes an assessment must deliver a written notice of objection stating its grounds to the relevant tax authority within 30 days from the date of service of the disputed notice of assessment. The NRS describes the same 30-day rule for federal assessments: an objection or appeal must be filed within 30 days from service, stating the grounds and attaching supporting documents.
The Act also says what the objection must contain: the specific issues disputed with their monetary values, the amendment required, the justification, and the profits, income and tax that the taxpayer admits. An objection that just says "the assessment is excessive" does not meet that standard. A full guide to the contents is in what to include in a tax objection.
Pay the part you do not dispute
The LIRS FAQs point to section 41(2) of the Act as making payment of the undisputed portion a prerequisite for a valid objection. The Act also says tax not under objection must still be paid.
In words: if an assessment covers several items and you agree with some of them, you pay the tax on those items and object to the rest. An objection without that payment risks being treated as invalid, which leaves the whole assessment standing.
Where you dispute every item, say so in the objection and explain why. The Act still expects you to state the profits, income and tax you admit, so set out your own figure, even if it is much lower than the LIRS's, and pay on that figure.
An assessment left alone becomes final and conclusive
Here is the consequence the title refers to. The LIRS FAQs say an assessment that is not objected to or paid within 30 days becomes final and conclusive, and must then be paid within 60 days.
"Final and conclusive" means the opportunity to dispute the figure through an objection has passed. The assessment is now the amount owed. The FAQ adds a further warning: an objection sent after a Pre-Action Protocol Notice is out of time.
The Act does allow the authority to extend the time for good cause. But an extension is something you ask for and the LIRS grants; it is not a right, and it is far weaker ground than an objection filed on time. The LIRS sets these rules out in its frequently asked questions, alongside its guidance on PAYE and the e-TCC.
If the objection is filed properly
Filing in time changes the position completely. Under the Act, if the authority does not respond to an objection within 90 days, the objection is upheld. Where the taxpayer and the authority do not reach agreement, the taxpayer may appeal. The NRS notes more generally that the Act sets out fines, interest and other consequences for late filing, late payment and underreporting, and gives taxpayers the right to appeal assessments and penalties.
Keep the e-Tax acknowledgement of your objection and the date it was filed. If the 90 days pass without a response, that record is your proof.
An unresolved assessment also stands in the way of other things. A Lagos e-TCC, for example, needs the LIRS assessments for the last three years fully paid; see getting a Lagos e-TCC.
Deadlines in Achekam, and the State's own channel
Achekam computes objection and appeal deadlines for Nigerian assessments from the approved administration rule, set to the end of the day in Lagos time. Its filing calendar leaves out any deadline whose rule is awaiting approval or contested, and says why. Treat a blank there as "confirm this date yourself", never as "there is no deadline".
Achekam lists every State Internal Revenue Service, but it leaves every State filing and payment to the State's own channel. An LIRS objection is filed on the LIRS e-Tax platform by a person, not by Achekam. Use the calendar to see the deadline coming, and e-Tax to meet it.
The day an assessment arrives
- Write down the date of receipt. The 30 days run from it.
- Read every line and mark what you agree with and what you dispute.
- Gather evidence for each disputed item: returns, payslips, contracts, bank records.
- Pay the undisputed portion and keep the payment evidence.
- File the Notice of Objection on e-Tax with specific grounds, the amounts disputed, the correction sought and the payment evidence.
- Keep the acknowledgement and diarise 90 days from filing.
- If you agree with the whole assessment, pay it within the 30 days.
Do steps one and two on the day the assessment arrives. Everything else depends on knowing early which parts you will fight.
General guidance only, not advice on your own circumstances. Tax and payroll rules change: check the current position with the authority or your adviser.
