After the classification of fund shares, if the fund shares retained by a single fund account exceed 5 million (including 5 million) on any open day during the duration of the fund, the fund registration institution will automatically upgrade the available fund shares held by a single fund account to B-level fund shares, and the relevant rate of B-level will apply on the day of upgrading.

It's divided according to share.

For details, please refer to the classification announcement of the Monetary Fund:/phfund/uploadfile//20060912093125750.pdf.