Funds with F after the money fund belong to the "automatic income upgrading mode", which has six types of shares: A, B, C, D, E and F. According to the deferral of the holding period, the fund is automatically upgraded from A to other shares, and the rate is gradually reduced.

Excluding holidays and other factors, the holding time within 7 days (including 7 days) is Class A, 7- 14 days (inclusive) is Class B, 14-30 days (inclusive) is Class C, 30-90 days (inclusive) is Class D, and 90 to 180.