Schwab study shows waiting to invest costs more than timing errors

A 20-year analysis by the Schwab Center for Financial Research indicates that delaying stock purchases to wait for lower prices likely results in greater financial loss than investing immediately, even during periods of high market volatility. The study, which examined S&P 500 index returns from 2005 to 2024 using hypothetical annual investments of $2,000, found that maintaining the longest possible time in the market produced the second-best financial outcome among the strategies tested.

The research compared four distinct approaches to deploying the same annual capital. Perfect market timing, defined as buying only at the lowest points, yielded $186,077 after 20 years of compounding. The strategy of investing as soon as possible each year, which maximizes time in the market, resulted in $170,555. This approach trailed the theoretical best case by only 8.3%. Dollar-cost averaging, where investments are spread out, produced $166,591. Even the worst-case scenario, involving purchases at the highest possible prices, still generated $151,343 for the long-term investor.

The data suggests that the penalty for imperfect timing is smaller than the cost of cash drag. While perfect timing is impossible, the gap between immediate investment and dollar-cost averaging is narrow. The study highlights that even a strategy characterized as the worst form of market timing outperforms sitting in cash, as the S&P 500 has delivered annualized returns of 9.98% since 1928. This historical performance includes periods of economic collapse and global catastrophe.

Current market conditions, including rising interest rates and concerns over corporate debt levels in the artificial intelligence sector, may make investors hesitant to deploy capital. However, the Schwab data implies these fears do not support pausing contributions. The Vanguard S&P 500 ETF (VOO), which tracks the index with an expense ratio of 0.03%, has delivered annualized returns of 14.94% over its first 16 years since inception. While past performance does not guarantee future results, low-cost index funds bought promptly and held for long-term growth remain the most effective strategy for most investors.