When you save into an account, you will earn interest. This is where your bank or building society pay money into the account because you save with them. An example would be if there is a savings account that earns 1% interest every year and you put £100 in to this account, over the first year you will earn £1 in interest.
Compound interest is interest you receive on top of previously earned interest.
It sounds like a riddle – but it's worth understanding, as it can supercharge your savings over time. Let's take a closer look using an example:
As above, you put £100 into your savings account at an annual interest rate of 1%. In the first full year, you earn £1 of interest.
But in the second year, the amount you earn increases – even if the annual interest rate stays the same – because compound interest starts to kick in.
So, in year two, you earn 1% of £101 – £1.01 in interest. In other words, you've just earned interest on your interest.
Thanks to compound interest, the longer you leave your savings untouched, the faster they grow. That's because you earn interest on increasingly larger balances that have grown with the help of interest earned in the past.