Turnover Rate

What Is Turnover Rate?

Portfolio turnover rate measures the percentage of a fund's or portfolio's holdings that are bought or sold during a specific period, typically one year. It indicates how actively a portfolio manager trades and directly impacts transaction costs, tax efficiency, and net returns.

How to Calculate Turnover Rate

Turnover Rate = Lesser of (Purchases or Sales) / Average Portfolio Value × 100

Turnover Rate Benchmarks

Portfolio Type	Typical Turnover	Example
Index fund (S&P 500)	3-5%	Vanguard 500 Index: ~4%
Buy-and-hold	10-20%	Berkshire Hathaway: ~10%
Active value fund	25-50%	Typical actively managed fund
Active growth fund	50-100%	Growth-oriented mutual fund
Quantitative/HFT	200-500%+	Algorithmic trading strategies

Example Calculation

A fund with $100M average value:

• Total purchases: $45M
• Total sales: $40M
• Turnover = $40M (lesser) / $100M = 40%

This means 40% of the portfolio was replaced during the year.

Impact on Returns

Turnover	Annual Tax Drag	Transaction Costs	Net Impact
5%	0.1-0.2%	~0.01%	-0.2%
50%	0.5-1.0%	~0.10%	-0.8%
100%	1.0-2.0%	~0.20%	-1.5%
200%	2.0-3.0%	~0.40%	-2.8%

Key Considerations

• Tax implications: High turnover generates short-term capital gains (taxed at ordinary income rates)
• Transaction costs: Each trade incurs bid-ask spreads, commissions, and market impact
• Not always bad: High turnover can be justified if it generates sufficient alpha
• Category matters: Compare turnover within the same fund category, not across all funds

Why It Matters

Turnover rate is a hidden cost indicator. A fund with 100% turnover may lose 1-2% annually to taxes and trading costs, which compound significantly over decades. Low-turnover strategies (index funds, buy-and-hold) preserve more wealth through tax efficiency and reduced friction.