Before you trek to Nepal, a TIMS (Trekkers’ Information Management Systems) card is very important. You can't do without one. There are various trekking permits for special kinds of treks. They are:
Special Trekking Permit for restricted/controlled areas
Trekkers’ Information Management System/TIMS Card
Conservation Area entrance fee
National Park entrance fee
Trekking peak climbing and mountaineering permit
Filming and documentary shooting permit
The most convenient place to apply for a TIMS card is at the Nepal Tourism Board office in Kathmandu. You can also apply for other area permits here, such as for the Upper Mustang Trek or Annapurna Circuit permits (ACAP permit).