The medical insurance deduction ratio will be adjusted on July 1, 2020. My personal guess is that it is a benefit provided by the state to reduce the burden on citizens due to the recent epidemic.

Medical insurance deductions are closely related to the social security base, with July 1 of each year as the dividing point. For example: July 1, 2019 - June 30, 2020, the social security base is for a whole year.

Assuming that the social security base is 4575, then the personal medical insurance deduction is 2% of the social security base, so the deduction is more than 90 yuan. From July 1, 2020 to June 30, 2021, the social security base is assumed to become 4200 yuan, then

The deduction is 84 yuan.

Partially lowered.