Compound Interest Example
Compound Interest Retirement Example — $500k at 65
How to reach $500,000 in retirement savings using compound interest.
Scenario
Goal: $500k at retirement. Starting at age 25, 7% APY.
Inputs
Goal$500,000
Rate7%
Time40 years (age 25–65)
Results
Required monthly (no initial)~$381/month
With $20k initial at 25~$220/month
Starting at 35 instead~$780/month
Total contributions (age 25)~$183k
Explanation
Starting at 25, you only need $381/month to reach $500k at 65 with 7% returns. Waiting until 35 more than doubles the required monthly amount to $780. That 10-year head start saves $200+/month — permanently.
Key Takeaways
- The first $1 you save at 25 is worth ~$15 at 65 (7% for 40 years).
- Automate contributions so you never see the money before it's invested.