Investment Return Calculator
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Understanding Your Investment Projections
Investment projections are powerful planning tools, but they assume a constant rate of return — real markets are volatile and returns vary widely year to year. Use these numbers as a directional guide, not a guarantee.
- Time in the market beats timing the market. Historical data consistently shows that staying invested through downturns outperforms strategies that try to avoid losses by moving to cash. Missing just the 10 best trading days in a 20-year period can cut your returns in half.
- Monthly contributions matter more than starting balance. Consistent $500/month contributions over 20 years at 8% ($120,000 total invested) grows to over $294,000. The regular contributions account for much of that growth — not just the starting amount.
- Tax drag is real in taxable accounts. Dividends and capital gains distributions are taxed annually in a regular brokerage account. In a tax-advantaged account (401k, IRA, Roth IRA), gains compound untaxed. The difference between taxable and tax-advantaged compounding over 30 years can be hundreds of thousands of dollars.
- Diversification reduces volatility without reducing expected returns. A diversified index fund (S&P 500, total market) historically achieves approximately the same long-term returns as concentrated stock picks, with significantly lower volatility and no individual company risk.
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Frequently Asked Questions
The S&P 500 has returned approximately 10% annually before inflation and ~7% after inflation over long periods. For a balanced portfolio (stocks + bonds), 6–8% is a realistic planning assumption. Conservative investors (more bonds) might use 4–5%. High-risk assets like individual growth stocks or crypto have higher potential returns and much higher volatility. Use 6–7% for realistic long-term planning.
Dollar-cost averaging (DCA) means investing a fixed dollar amount at regular intervals — monthly, bi-weekly, etc. — regardless of market prices. When markets are down, your fixed amount buys more shares at lower prices; when up, fewer shares at higher prices. Over time, this automatic process lowers your average cost per share and eliminates the stress of trying to time entries and exits.
Nominal returns are the raw percentage gain. Real returns subtract inflation to show true purchasing power growth. If your portfolio returns 9% but inflation is 3%, your real return is ~6%. For long-term planning, understanding real returns prevents overestimating future wealth. A $1M portfolio in 30 years has roughly $412,000 in today's purchasing power at 3% inflation.
Start by investing enough to capture your full employer 401(k) match (free money). Next, aim for 15% of gross income across all retirement accounts. If starting out, invest whatever you can and increase by 1% of salary per year. Even $100/month at 7% over 30 years grows to $122,000. The most important thing is to start — the amount matters far less than the habit.
The S&P 500's long-term average annual return is approximately 10% before inflation, based on data from 1926 to the present. After adjusting for ~3% average inflation, the real return is about 7%. Individual years vary dramatically — from +50% to -50% — but long-term investors who stay the course have historically been rewarded. Past performance does not guarantee future results.