About DutyMath

DutyMath is run by Abdul Hannan, under AH Digital Studio. It is an independent estimator, built on one rule: every rate carries its source and the date it was checked, on the result itself — not in a footnote nobody reads. Where a figure could not be verified to that standard, the site says so in the open: the new-car NAC rate is labelled REPORTED, the FOB levy's contested collection status is printed on every result that includes it, and the one decomposition question we could not settle is set out in full on the methodology page, residual risk and all.

The calculators cover the charge stack under the 2026 Fiscal Policy Measures — duty, NAC levy, Green Tax, surcharge, ETLS, the FOB levy and VAT — gated by your Form M date across the three regimes 2026 actually contains, with the customs-valuation uplift treated as a feature rather than a surprise. Port-side charges are covered too, kept in their own planner and their own column, because they are market charges and not tariffs.

DutyMath is not the Nigeria Customs Service, the Federal Ministry of Finance, the National Automotive Council or any government agency, and nothing here is an assessment. The assessment on your car is issued by Customs on its own valuation; these tools exist so you can arrive at that number already knowing what it should look like — and what to query when it doesn't.