Compounding and why starting early wins

Compounding is the reason a pension started at 25 can beat a much larger one started at 40, and the reason a 1% annual charge is not a small detail.

How it behaves

Growth earns growth. In the early years the effect is almost invisible, which is precisely why people postpone starting. In the later years the pot grows by more each year than you contribute. Nearly all of the eventual value is created in the final third of the period - but only if the first third happened.

A simple illustration: contributing steadily from 25 to 65 versus starting at 35 does not cost you a quarter of the pot. It commonly costs closer to half, because the missing years are the ones with the longest time to compound.

Charges compound too

Charge drag is compounding running against you. A platform and fund charge of 1% a year rather than 0.3% sounds trivial; over forty years it can remove a meaningful double-digit percentage of the final pot. When comparing pensions and funds, the annual charge is one of the few variables you can control with certainty.

Think in real terms

A projection showing a large future pot is misleading unless it is stated in real terms - today's money, after inflation. Good projection tools let you toggle this. Always look at the inflation-adjusted figure before deciding you are on track.

What this means in practice

1. Start now, even small. Time matters more than amount at the beginning. 2. Increase with every pay rise. Contributions that grow with income compound harder. 3. Keep charges low and check them once a year. 4. Leave it alone. Reacting to market falls by switching to cash converts a temporary drop into a permanent loss.