Monthly Investment to Reach $1 Million by Age 65
Starting from $0, investing at the end of each month, with returns compounded monthly:
| Start age | Years | At 7%/year | At 10%/year |
|---|---|---|---|
| 20 | 45 | $264 | $95 |
| 25 | 40 | $381 | $158 |
| 30 | 35 | $555 | $263 |
| 35 | 30 | $820 | $442 |
| 40 | 25 | $1,234 | $754 |
| 45 | 20 | $1,920 | $1,317 |
| 50 | 15 | $3,155 | $2,413 |
| 55 | 10 | $5,778 | $4,882 |
Every five years of delay roughly multiplies the monthly amount by 1.4–1.7. Starting at 25 instead of 35 cuts the required investment at 7% from about $820 to $381 a month.
Monthly Investment to Reach $1 Million in a Set Number of Years
| Time horizon | At 7%/year | At 10%/year |
|---|---|---|
| 5 years | $13,968 | $12,914 |
| 10 years | $5,778 | $4,882 |
| 15 years | $3,155 | $2,413 |
| 20 years | $1,920 | $1,317 |
| 25 years | $1,234 | $754 |
| 30 years | $820 | $442 |
To become a millionaire by 30 starting at 20, you would need about $5,778 a month at 7%. By 40 starting at 25, about $3,155. By 50 starting at 30, about $1,920 (with nothing saved yet).
What Return Should You Use?
Long-run U.S. stock returns have averaged roughly 10% a year including dividends since 1928 (Aswath Damodaran, NYU Stern, data through 2025), about 7% after inflation. Bonds and cash have earned less. Because results are in future dollars, using 7% gives you a rough answer in today's purchasing power; using 10% shows the nominal amount. Fees, taxes and bad timing all reduce what you actually earn.
Ways to Close the Gap
- Use tax-advantaged accounts. For 2026 the IRS lets employees defer up to $24,500 into a 401(k) (plus $8,000 catch-up at 50+, or $11,250 at ages 60–63), and contribute up to $7,500 to an IRA. An employer match counts toward your monthly total.
- Raise contributions with each pay rise. Increasing your investment by even 3% a year shortens the timeline noticeably.
- Adjust the target age. Moving the goal by five years often halves the monthly requirement.
These are projections with a constant return, not predictions. Markets fluctuate and past returns do not guarantee future results. General information only, not financial advice.