Read the following case and answer the following question:

Hassan is a part-time instructor who joined XYZ school at the beginning of the 2020 taxable year. At the end of the year the following information provided:

Hassan is involved in some administration works in addition to his teaching load and he received a fixed rate of payment per month.

Any extra hours he works the school paid him overtime.

All the work performed by Hassan is controlled by his direct supervisor in XYZ.

Hassan has the right to accept or reject any tasks assigned to him.

All the courses and administrative work must be conducted inside the school.

Question:

From a taxation point of view, what is the best category you will choose to categorize Hassan in, Self-employment or employment? and why?