How Much Do I Need to Save Monthly to Have $1 Million by 65?
The Short Answer
Starting at 25, you need about $400/month invested at 8% average returns to reach $1M by 65. Starting at 35, that jumps to $900/month.
The Detailed Breakdown
Calculated using the future value of annuity formula with monthly compounding at 8% annual return.
| Calculation | Value | Assumptions |
|---|---|---|
| Monthly Savings (Start at 25) | $400/mo | 40 years, 8% avg return |
| Monthly Savings (Start at 35) | $900/mo | 30 years, 8% avg return |
| Monthly Savings (Start at 45) | $2,200/mo | 20 years, 8% avg return |
Key Assumptions
- 8% average annual return (S&P 500 historical average).
- Contributions made monthly, compounded monthly.
- No taxes on growth (tax-advantaged account assumed).
- Consistent contributions with no withdrawals.
Adjust for Your Situation
Start early and invest consistently -- time and compound interest do the heavy lifting.
Use the Free CalculatorWhat Affects This Result
Starting Age
Each decade of delay roughly doubles the required monthly savings.
Return Rate
A 10% return vs 8% cuts required savings by ~30%.
Inflation
$1M in 40 years has ~$450K in today's purchasing power.