Here's the timeline to $1 million at a 10% average annual return (roughly the long-run S&P 500 average before inflation), starting from zero:
| Monthly Investment | Years to $1 Million |
|---|---|
| $100 | 44.5 |
| $300 | 33.7 |
| $500 | 28.8 |
| $750 | 25.0 |
| $1,000 | 22.4 |
The first takeaway: starting early beats investing more later. Someone who invests $500/month from age 25 hits $1M around 54. Someone who waits until 40 and invests $1,000/month — twice as much — gets there at almost the same age, having contributed far more.
The Fee That Steals $427,000
Now watch what a single percentage point of fees does. Same $500/month, same 35 years:
| Average Annual Return | Final Balance |
|---|---|
| 10% (low-fee index fund) | $1,898,319 |
| 9% (a 1% fee drag) | $1,470,892 |
| 8% (a 2% fee drag) | $1,146,941 |
A 1% annual fee — which sounds trivial — costs you $427,427 over 35 years. A 2% fee eats over $750,000. This is why the "cheapest way" framing matters: the biggest enemy of your million isn't market crashes. It's the fees you barely notice.
Actively managed funds commonly charge 0.5%–1.5% per year. Total-market index funds charge around 0.03%. Over a lifetime, that gap is worth a house.
The Cheapest Path, Step by Step
- Get the employer match first. If your 401(k) matches 50% of contributions up to 6%, that's an instant, risk-free return no investment can beat. The 2026 IRS limit is $24,500 ($32,500 if you're 50+).
- Open a Roth IRA or max the 401(k). The 2026 IRA limit is $7,500 ($8,600 with catch-up at 50+). These accounts are independent — you can do both.
- Buy one total-market index fund. Set it and forget it. A single U.S. total stock market fund with an expense ratio near 0.03% is all most investors need.
- Automate contributions. Money you never see, you never miss — and you never time wrong.
- Increase with raises. Bump your contribution 1% every raise. You'll never feel it, and it shaves years off the timeline.
What About "Just Pick Better Stocks"?
The data says: don't. The overwhelming majority of professional fund managers underperform simple index funds over 15-year periods, and they charge ten to fifty times more for the privilege. If the pros can't reliably beat the index with full-time research teams, stock-picking in your spare time is the expensive way, not the cheap way.
Frequently Asked Questions
How long does it take to save $1 million?
At a 10% annual return, $500/month gets you there in about 29 years. $1,000/month gets there in about 22 years.
What return should I assume for planning?
About 10% nominal (before inflation) is the long-run historical average for U.S. stocks; roughly 7% after inflation. Past performance doesn't guarantee future results — use conservative estimates.
Is $1 million enough to retire?
It depends on your spending. At a 4% annual withdrawal rate, $1M produces about $40,000/year. Many retirees pair that with Social Security.
Should I invest while paying off debt?
Grab your full 401(k) employer match first. Then compare: paying off a 22% credit card beats any expected investment return.
What's the minimum to start investing?
Many brokerages now let you start with $1 and buy fractional shares. The barrier is psychological, not financial.
Disclaimer: This article is for general information only and is not financial advice. Investing involves risk, including loss of principal.
Tool tie-in: A compound growth calculator would fit here — let readers drag a slider for monthly investment and fees to watch the timeline to $1M change in real time.