What Is Portfolio Turnover in Mutual Funds?

Portfolio turnover measures how frequently a mutual fund buys and sells its holdings over a year. It’s a useful but often-overlooked clue to a fund’s style and hidden costs.

How it’s measured

Turnover is expressed as a percentage. A 100% turnover roughly means the fund replaced its entire portfolio once during the year; 25% suggests a more buy-and-hold approach. You’ll find it in the fund’s factsheet.

Why it matters

• Trading costs — every trade incurs brokerage, STT and impact costs. High turnover (churn) means more of these costs, which quietly drag on returns even though they’re not fully in the headline expense ratio.
• Style signal — high turnover suggests an active, momentum/tactical approach; low turnover suggests a patient, conviction-led style.
• Tax (for you, in some structures) — frequent trading inside the fund is handled by the fund, but a fund that churns a lot is taking on more execution risk.

High vs low — which is better?

Neither is automatically better:

• Low turnover funds (and index funds, which barely trade) keep costs down — often an edge over the long run.
• High turnover can be justified if the active trading consistently adds enough return to cover its costs — but often it doesn’t.

How to use it

Compare turnover across similar funds. If two funds perform alike but one churns far more, the lower-turnover one is doing it more efficiently. Read it alongside expense ratio and consistency. Education only, not a recommendation.