Compounding is powerful, but it rewards the patient and punishes the impatient. Most of the money left on the table comes from a handful of avoidable mistakes.
1. Waiting "until the numbers are bigger"
The single biggest lever in compounding is time, not rate or amount. Two people can contribute the same total and end up with wildly different outcomes based only on when they started. A small amount started early routinely beats a larger amount started late. The cost of waiting grows the longer you wait.
2. Raking out the growth
Capturing gains feels safe, but every dollar you withdraw is a dollar that will no longer compound. If you keep interrupting the process to "lock in" growth, you convert a compounding curve into a series of flat lines. Decide ahead of time which money is long-term and leave its growth alone.
3. Chasing yield at the cost of the base
A striking rate is meaningless if it comes with more risk, higher fees, or a reason to churn your holdings. Compounding amplifies whatever you start with; a high-fee product compounds the fee against you. Keep the base growing steadily and let the rate be the secondary consideration.
Use the compound interest calculator to see exactly how a few extra years, or a slightly higher contribution, change the outcome on your own numbers.