Interest rate

In plain words

The interest rate tells how much extra the borrower pays for each unit borrowed over a period. A rate of 12% a year on 1,000 means about 120 of interest over a year if the whole sum is outstanding the entire time. In practice the debt falls as it is repaid, so the interest actually paid is lower.

How it looks in practice

Rates are fixed or floating. A fixed rate stays the same for the whole term. A floating one is tied to a benchmark and moves with it. Short loans often show a daily rate, for example 0.5% a day, which sounds small until it is multiplied by 365. Interest may be charged on the remaining balance or on the original sum, and that difference alone changes the cost noticeably.

Why it matters to an owner

For a lender, the rate has to cover the cost of funds, operating costs and expected losses from defaults, and still leave a margin. Set it too low and bad loans eat the profit. Set it too high and good borrowers leave, while the ones who stay are those who could not get money elsewhere. That worsens the portfolio over time.

Common mistake

Comparing loans by the nominal rate alone. Fees, insurance and the payment schedule can make a loan with a lower rate more expensive in total. The fair comparison is the effective rate, which includes all mandatory payments. Many countries cap rates or require a specific way to disclose them, so pricing should be checked with a lawyer.