In India, Pakistan and Bangladesh, a tehsildar is a tax Officer accompanied with Revenue inspectors. They are in charge of obtaining taxes from a tehsil with regard to Land Revenue. A Tahsildar also known as Executive Magistrate of the tehsil concerned. The term is assumed to be of Mughal origin, and is perhaps a mental
of the words "tehsil" and "dar" ("tehsil", presumably an Islamic word derived from Arabic meaning "revenue collection" and "dar", a Persian word meaning "holder of a position").
The immediate subordinate of a tehsildar is known as a naib tehsildar also known as Deputy Tahsildar.
During British rule, a Tehsildar was most likely a stipendiary officer of the government, employed to raise revenue. It was also called as Mamlatdar in some parts of Maharashtra. It was subsequently used by Pakistan and India following their independence from the British Empire. Tehsildar is also known as Talukdar in some states of India.In the 17th-century saint composer Kancharla Gopanna who was known as Bhakta Ramadas. Gopanna was the Tahasildar of Bhadrachalam (second half of the 17th century), is said to have used money from the government treasury to build the Bhadrachalam Temple, and was imprisoned in a dungeon at Golconda.
Now in the government we called as Mandal revenue officer but in some states we called as same as above.
Tehsildar are Class II Gazetted Officers in most of the states of India. They implement the various policies of the taluka and are subject to the District Collector. Officers holding the post of Tehsildar preside over matters related to Land, Tax and Revenue. Tehsildar were first appointed as Naib Tehsildars after successful completion of a Civil Services Examination (i.e. PCS in Uttar Pradesh, HPAS in Himachal Pradesh, RAS in Rajasthan, MPPCS in Madhya Pradesh, BAS in Bihar, APPSC in Andhrapradesh, TSPSC in Telangana or other equivalent exams in other states of India), or promoted from a subordinate post like Kanoongo (also known as Revenue Inspectors). Later on, they get promoted to the post of Tehsildar according to cadre rules.
Each state is divided into districts. The district's senior civil servant is the District Collector/District Magistrate, who is an officer from the IAS cadre. These districts are further subdivided into Revenue Subdivisions or Prants (West India). Each Subdivision is under the charge of an officer designated as a Subdivisional Magistrate (S.D.M.) or Deputy Collector who is a member of the State Civil Services cadre. These subdivisions are divided into various Tehsils or Talukas. These Tehsils or Talukas are administered by a Tehsildar, also known as a Talukdar in some states of India. The Tehsils/Talukas are further divided by groups of villages. Each group comes under the charge of a Kanoongo (also known as a Revenue Inspector). These villages are put under a village level revenue employee and is known as a Lekhpal or Patwari. This hierarchy is mainly used for administrative activities, including the identification and collection of revenue from land. A separate hierarchy exists for law enforcement in each district.