The Department of Immigration (DOI) is guided by legal framework laid down by Immigration Act, 2049; Immigration Regulation, 2051 & Immigration Procedure, 2065 and thus derives functions of issuing Visa, Trekking Permit, detaining and investigating on violations or breaching of the Immigration laws of country and filing lawsuits in the court. These functions are administered through DOI office (Kathmandu) and ten Entry and Exit points including Immigration office, TIA (Tribhuvan International Airport).
On Arrival tourist visas are issued by Immigration Offices at Entry and Exit points except Immigration office, Pokhara. Immigration office, Pokhara extends Tourist Visa and issues trekking permits for restricted areas trekking unlike other Entry and Exit points. Tourist visa extension can be done from the Department of Immigration (DOI), Kathmandu. Non Tourist visa is issued and extended only from the DOI office, Kathmandu.