1. Planning function: The tax department should define the objectives and indicators in performance management, including tax revenue objectives, tax collection and management objectives, taxpayer service objectives, etc. By setting corresponding indicators such as growth rate, compliance rate and satisfaction, the realization of the goal can be effectively measured.

2. Organizational function: In order to achieve the established goals, the work should be organized. Understand the work progress and performance level through regular evaluation and monitoring, find problems in time and take corresponding measures to solve them. This organizational function helps to maintain efficient operation and ensure that all tasks go smoothly as planned.

3. Leadership function: On the basis of evaluation and monitoring, leaders need to provide feedback information to tax authorities, highlight existing problems and deficiencies, and put forward suggestions for improvement and relevant measures. Leaders play an important role in encouraging the team to pursue outstanding performance, promoting change and optimizing management methods, and play an important leading role in the whole process.