Compound Interest and Retirement Planning
Retirement planning is one of the most important applications of compound interest. The earlier you start, the less you need to save each month to reach your goal.
How to Use a Compound Interest Calculator for Retirement
- Principal: Your current retirement savings balance.
- Monthly contribution: What you plan to add each month.
- Annual rate: Expected average return (historically 7% for diversified index funds).
- Time: Years until retirement.
Retirement Scenarios
Starting with $10,000 and adding $500/month at 7% annually:
- 20 years: ≈ $262,000
- 30 years: ≈ $612,000
- 40 years: ≈ $1,327,000
The 4% Rule
A common retirement guideline states you can withdraw 4% of your portfolio annually without running out of money. To support $40,000/year in retirement, you need $1,000,000 saved.
Tax-Advantaged Accounts Amplify Compounding
401(k) and IRA accounts let your investments compound without annual tax drag. This can add tens of thousands of dollars to your final balance compared to a taxable account.
Run your own retirement projection with our compound interest calculator.