Turnover Ratio

The turnover ratio tells you how much portfolio churn occurs inside a fund. A ratio of 25% means the fund replaced one-quarter of its holdings over the year; a ratio of 200% means it turned over the entire portfolio twice. High turnover often signals active trading in pursuit of short-term gains, while low turnover suggests a buy-and-hold approach.

Calculation and interpretation

Turnover is calculated as (purchases + sales) ÷ 2, divided by average assets under management. A fund that bought and sold securities worth 50% of its assets during the year has a 50% turnover ratio. Passively managed index funds typically have turnover ratios between 5% and 15%, driven only by rebalancing and shareholder flows. Many actively-managed-fund run 50% to 100% or higher, constantly repositioning to exploit perceived market inefficiencies.

Trading costs and slippage

Every time a portfolio manager buys or sells a stock, the fund incurs hidden costs: the bid-ask spread (the difference between what buyers and sellers will pay), market-impact costs (moving the market with large orders), and commissions (though these have fallen dramatically in recent years). These costs reduce fund returns but don’t appear in the expense-ratio. A fund with 100% turnover and small average positions might pay 0.20% to 0.50% annually in total trading costs — a figure that appears nowhere in the prospectus. High-turnover funds disguise a substantial portion of their true cost burden.

Tax implications in taxable accounts

High turnover generates frequent capital gains realizations. When a manager sells a stock at a profit, the fund realizes a capital gain and must distribute it to shareholders. Actively-managed-fund often distribute significant gains annually, which are taxable to investors holding the fund in taxable (non-retirement) accounts. A fund with 80% turnover typically creates more taxable distributions than one with 20% turnover. Passively-managed-fund generate minimal distributions, giving them a tax-efficiency edge especially valuable in taxable accounts.

Sector rotation as a driver

Funds pursuing sector-rotation strategies intentionally maintain high turnover, shifting capital among industries based on market cycle views. A manager who believes technology will outperform in 2024 and industrials will outperform in 2025 must constantly reweight. This is a deliberate trade-off: hope for outperformance justifies the trading costs. But the bar for success is high — the fund must correctly time sector rotation often enough to beat the costs incurred.

Value traps in high-turnover strategies

Some high-turnover funds genuinely create value through superior timing or security selection. Others are engaged in performance chasing: managers sell recent losers (locking in losses) and buy recent winners, a pattern that often backfires as markets mean-revert. Investors comparing two funds should examine the composition of turnover, not just its magnitude. A fund buying and holding undervalued stocks long-term has low turnover and low costs. A fund constantly chasing momentum has high turnover and usually lagging returns after all costs.

Regulation and reporting

Mutual funds are required to report turnover ratios in their prospectuses and fact sheets, though the precise calculation method varies slightly. Most funds publish the figure annually. Some online fund databases and intermediaries highlight turnover prominently, making it easy to compare. A prospectus listing 200% turnover should trigger the question: are those trading costs justified by outperformance?

The low-cost winner

All else equal, a fund with 15% turnover and a 0.30% expense ratio will almost certainly outperform one with 150% turnover and the same 0.30% ratio, because the trading costs for the second fund are hidden and substantial. This is one reason passively-managed-fund with minimal turnover often beat active alternatives over long periods.