flat tax

Think of a danfo where every passenger pays ₦200 no matter if they boarded at the first stop or the last one, no matter if they are carrying one bag or four. That is the spirit of a flat tax. One rate, applied to everyone, without the rate climbing as the amount climbs.

Most tax systems, including Nigeria's personal income tax, work in bands. The more you earn, the higher the rate on the extra income above certain thresholds. That is called a progressive system, and it means a person earning ₦10,000,000 a year pays a bigger percentage than someone earning ₦1,000,000. A flat tax throws that ladder away and says everyone pays, say, 15 percent, full stop, regardless of how much they bring home.

Some countries have tried this idea seriously. Russia ran a flat personal income tax for years, and a handful of Eastern European countries still use versions of it, arguing that it is simpler to calculate and harder to dodge because there is no complicated band structure to manipulate. The UK does not use a flat tax for income, it uses bands like Nigeria, but you will still hear the phrase in political debates whenever someone proposes scrapping the bands for one clean number.

The argument for it is simplicity. No accountant needed to work out which band your income falls into, no confusion about marginal rates. The argument against it is fairness. A flat 15 percent takes a much bigger bite out of someone earning ₦150,000 a month than someone earning ₦15,000,000 a month, because the person on the lower income has less room to breathe after tax. That is why most governments, Nigeria included, stick with progressive bands instead.

For the diaspora reader, this matters when comparing tax talk across countries. If a relative in Lagos tells you their tax rate jumped because they crossed into a new income band, and you are in the UK hearing politicians debate a flat tax proposal, you are actually talking about two different philosophies of fairness, more than two different numbers.