What Is a Realistic Investment
Return to Expect?

Pick the wrong return rate for your projections and everything downstream is wrong. Use 12% and you're planning for fantasy numbers that will disappoint you. Use 4% and you'll think you need to work 10 years longer than you actually do.

Here's how financial planners actually think about expected returns — and what number you should use for your own projections.

The Historical S&P 500 Return

The S&P 500 has returned approximately 10% per year on average since 1926, including dividends reinvested. That's the number you'll see most often cited, and it's accurate for the full historical record.

But there's an important distinction:

• Nominal return (~10%): Raw percentage gain before adjusting for inflation
• Real return (~7%): Inflation-adjusted return (subtracting ~3% average inflation)

When you're doing retirement planning in today's dollars, the real return is what matters. $2 million in 2055 is not the same as $2 million today — inflation erodes purchasing power. Most honest projections use 7% when thinking in inflation-adjusted terms.

The Expense Ratio Deduction

Whatever return the market produces, your actual return is reduced by fund expenses. This is where fund selection has real impact:

Fund Type	Typical Expense Ratio	Impact on 7% Real Return
Vanguard / Fidelity index fund	0.03–0.10%	~6.92% effective
Average mutual fund	0.50–1.00%	~6.25% effective
Actively managed fund	1.00–1.50%	~5.75% effective
Advisor-managed with AUM fee	1.50–2.00%	~5.25% effective

A 1.5% difference in fees on a $500,000 portfolio costs you $7,500/year. Over 20 years of retirement, that's over $200,000 in losses from fees alone — which is why low-cost index funds have become the default recommendation for most investors.

Why Future Returns May Be Lower

Many financial economists argue that future stock returns will be lower than the historical average for structural reasons:

• Valuation levels — P/E ratios today are significantly higher than historical averages, which historically predicts lower 10-year forward returns
• Lower growth environment — Slower population growth and productivity gains may mean slower corporate earnings growth
• Interest rate environment — Higher baseline interest rates make bonds more competitive with stocks, potentially suppressing equity returns

Research firm Vanguard's 10-year forward return model as of recent years projected U.S. equity returns of 4.2–6.2% annually (real). That's meaningfully below the historical 7% average.

This doesn't mean you should panic. It means using 5–6% as your planning number is prudent, and if markets outperform, you're pleasantly ahead of plan.

The Behavioral Return Gap

There's one more number that matters: the gap between what the market returns and what investors actually earn. Research consistently shows the average investor underperforms the index by 1–2% per year due to behavioral mistakes — buying after runups, panic-selling in downturns, chasing past performance.

This means the most important return-related decision you can make isn't fund selection — it's staying invested during market downturns. The investor who earns the market's return is the one who stops checking their portfolio during crashes and doesn't touch it for 30 years.

Putting It Together

Here's a practical framework for what return rate to use:

• Conservative planning (to stress-test): 5%
• Baseline planning (realistic): 6–7%
• Optimistic scenario: 8%
• Historical maximum (don't plan on this): 10%

Plan conservatively so that any outperformance is a bonus, not a necessity. The people who get into trouble are the ones whose retirement plan only works if markets deliver 10% forever.