The percentage of a mutual fund or other investment vehicle's holdings that have been "turned over" or replaced with other holdings in a given year. The type of mutual fund, its investment objective and/or the portfolio manager's investing style will play an important role in determining its turnover ratio. For example, a stock index fund will have a low turnover rate, but a bond fund, whether passively or actively managed, will have high turnover because active trading is an inherent quality of bond investments. An aggressive small-cap growth stock fund will generally experience higher turnover than a large-cap value stock fund.All things being equal, investors should favor low turnover funds. High turnover equates to higher brokerage transaction fees, which reduce fund returns. Also, the more portfolio turnover in a fund, the more likely it will generate short-term capital gains, which are taxable at an investor's ordinary income rate.Turnover ratios for a mutual fund will vary from year to year, but the general range can be assessed by looking at the figure over a few consecutive years.