interest
Interest is the fee you pay to borrow money, or the reward you earn for saving it, calculated as a percentage over time.
In plain English
Your cousin Chidi borrows ₦100,000 from a bank to fix his generator business, and three months later he owes ₦105,000. Your aunty Ngozi puts ₦100,000 into her savings account, and three months later she has ₦102,000. Same word, two completely different feelings, and that is the whole story of interest right there.
Interest is simply the price of money over time. When you borrow, you are renting someone else's money, and the interest is the rent. When you save, you are lending your money to the bank, and the interest is what they pay you for the privilege of using it while it sits there.
The rate is usually written as a percentage per year, even if it gets applied monthly or daily. A loan at 24% a year sounds calm until you realise that is 2% every month, calmly adding up on top of what you already owe.
In the United Kingdom, someone might see their savings account offering 4% a year while their credit card charges 22% a year on any balance they carry. That gap is not an accident. Banks earn more lending than they pay savers, and the difference is a big part of how they stay in business.
For the person abroad sending money home, interest matters twice. If you are saving in a UK account before transferring, low interest there might tempt you to move funds faster to a higher yielding Nigerian savings account instead. If you are helping family pay off a loan, understanding the interest rate tells you whether you are helping them escape debt or just refilling a leaking bucket.
Uncle Femi saves ₦500,000 at 5% a year. After twelve months, his bank owes him ₦525,000 in interest alone, on top of his original ₦500,000, assuming nothing is added or withdrawn along the way.
Questions people ask
Why do loans usually charge more interest than savings pay?
Banks need a profit margin to cover their costs and risks, so they charge borrowers a higher rate than they give savers, and the gap between the two is largely how banks make money.
Does interest change if I pay a loan back early?
Often yes, because many loans calculate interest based on how long the money was actually outstanding, so paying early can reduce the total interest owed, though some lenders add early repayment fees, so it is worth checking first.
Is a higher interest rate always better for me?
Only if you are the one saving or lending. If you are the one borrowing, a higher rate works against you, so always check which side of the transaction you are standing on before celebrating a big number.
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