Penalties for failure to deduct or remit WHT.
Total penalty and interest
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Failure-to-deduct penalty
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Failure-to-remit penalty
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Interest (CBN rate)
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Two separate failures, two separate penalties
This is the point that confuses most people, so it is worth stating plainly. There are two distinct ways a payer can fall foul of the withholding rules, and they bite on different sums of money. Failing to deduct means you paid a vendor the full amount and never held back the tax at all. Failing to remit means you did deduct correctly but then sat on the money instead of sending it to the tax authority. They are not the same offence taxed twice. One looks at tax that was never withheld, the other at withheld tax that never moved on. A single payment run can produce both at once, on different invoices, which is why this calculator gives each its own line.
The penalty rates modelled here are 40 percent of the amount that should have been deducted, and 10 percent of the amount that was withheld but not remitted, with interest running on the unremitted sum. Those are the figures this calculator applies, consistent with the long-standing penalty structure, but the 2025 tax reform is revising several enforcement provisions, so confirm the current rates and the interest basis with the FIRS, the Federal Inland Revenue Service, before relying on a number for a real assessment.
How the CBN-rate interest is built
Interest is layered only on the amount you failed to remit, not on the failure-to-deduct figure. The calculator runs it as simple annual interest at the Central Bank of Nigeria monetary policy rate, currently 27.5 percent as modelled here, scaled by the months overdue. So six months at 27.5 percent works out to half a year's interest, not a compounding monthly charge. The CBN reviews that rate at its policy meetings, so the live figure can differ from the one shown, and the FIRS sets the precise interest mechanic it applies in practice.
A NGN 500,000 and NGN 300,000 default, six months late
Picture a company that paid a contractor without deducting NGN 500,000 of WHT, and separately withheld NGN 300,000 on another invoice but never remitted it, with that remittance now six months overdue. Using the rates this calculator applies, the failure-to-deduct penalty is 40 percent of NGN 500,000, the failure-to-remit penalty is 10 percent of NGN 300,000, and interest is NGN 300,000 at 27.5 percent for half a year.
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The chart stacks the three components so you can see how heavily the failure-to-deduct penalty dominates, dwarfing both the remittance penalty and the interest in this scenario.
The lesson is blunt. Failing to deduct in the first place is the expensive mistake, because the 40 percent penalty is four times the remittance penalty and applies even when you simply forgot. The interest, by contrast, grows slowly enough that the real damage is the penalty, not the delay.
Who needs this and the trap to sidestep
The tool is for finance teams reconciling a back catalogue of payments, auditors sizing an exposure, and any business that has just realised it skipped deductions during a busy stretch. The trap is assuming that because you eventually paid the vendor in full, no tax problem exists. The obligation was to withhold and remit, and paying the vendor more does not discharge it. If you discover a lapse, voluntary disclosure to the FIRS before an audit usually lands better than waiting to be caught, and it can limit how the penalties stack up.
Penalty questions people search
If I deducted but remitted late, do I owe the 40 percent too?
No. The 40 percent penalty is only for amounts you never deducted. If you deducted correctly and the sole failure is late remittance, you face the 10 percent remittance penalty plus interest, not the 40 percent. Enter zero in the not-deducted field to model that case.
Does the interest keep climbing while a dispute is open?
Interest is tied to the period the tax stays unremitted, so it generally continues to accrue until you pay, even if you are contesting the assessment. That is why settling the undisputed portion early can be cheaper than letting the whole sum run. The FIRS confirms how it treats interest during an objection.
Can the tax authority waive or reduce a WHT penalty?
Revenue authorities do have administrative room to remit or reduce penalties in genuine cases, often tied to voluntary disclosure or a first lapse, though it is discretionary rather than a right. Approach them with the figures already worked out and the underlying tax paid, which strengthens the case for relief.