Compound interest: how time gets even small money moving
The most powerful and most underrated tool in personal finance — and it works against you on debt. This overview shows why time weighs more here than the size of the deposit.
This text was created or edited with the help of artificial intelligence and passed human editorial review before publication. Always verify figures, prices and terms against the current conditions of the specific provider.
What to weigh up
- Interest is calculated not only on the deposit but on the interest already credited, so growth keeps speeding up.
- At ~7 % a year a sum roughly doubles in ~10 years.
- Someone starting earlier with small amounts often ends up ahead of someone starting later with bigger ones. Which is more realistic for you today — starting small, or waiting for more?
- It runs the other way too: interest on expensive debt compounds against you in exactly the same way.
Try it yourself
Step 1 of 3
What's your horizon (when will you need the money)?
What to work out before you decide
- 1.How many years you have to your goal. With compounding that is a stronger variable than the size of the deposit.
- 2.What regular amount is sustainable for you even in a bad month. Sustainability matters more than size.
- 3.Whether you want to take returns out or leave them working. Reinvestment is what fuels the whole effect.
You can live through this decision
In the “Young Family” track you reach the same choice — and see where it takes you a few years on.
This is not financial advice. Numbers are illustrative and for educational purposes only. Always verify current conditions with your provider before making any financial decision.