What the number actually means
Think of it as a passport number for a product. The first six digits are the same in every country, agreed internationally, so a laptop is 8471.30 in Lagos, in London and in Shanghai. That is what makes world trade possible: two customs services on opposite sides of the planet can describe the same object without speaking the same language.
After the first six, each country adds its own digits to be more precise. Nigeria adds four, which is why the codes here are ten digits long.
Reading one is easy once you know the pattern:
84 is the chapter, machinery. 8471 is the heading, computers. 8471.30 is the subheading, portable computers. The remaining digits are national detail.
Why it decides your tax
Each code sits in a band: 0%, 5%, 10%, 20% or 35% in Nigeria. Some carry an extra levy on top, some carry excise duty, and a few are banned from import altogether.
So the code is not paperwork. It is the single decision that sets your tax rate, and it is made before you pay your supplier, by somebody who often does not realise they are making it.
How to get yours right
One: search here, in your own words. The search understands plain English as well as the tariff's own wording, so "fridge" finds refrigerators.
Two: ask your supplier. Their export declaration or commercial invoice usually carries the six-digit code. Their code is a strong hint for yours, though not proof, because countries differ after the sixth digit.
Three: for anything large, get it in writing. Have a licensed customs agent classify it formally, and do it before you pay for the goods. A classification argued at the port, while storage charges run, is an argument you lose.
The trap that catches importers most
Search for cars, fridges or televisions and you will often see the same product twice at very different rates. One line says CKD, meaning Completely Knocked Down: the item shipped in pieces to be assembled locally by a registered manufacturer. That line carries a low rate. The other line is the fully built product, at a much higher rate.
If you are importing a finished item, the fully built line is yours. Choosing the CKD rate because it looks better is how an importer ends up with a debit note, a stalled container, and a bill that grows daily.
One honest warning
Tariff schedules are revised and government levies change with policy. Treat every rate here as a well-informed starting point, not a ruling.