People from all countries except India require a valid passport to enter Nepal. An Indian national must have any of their documents like Passport , Election Commission Card with Photo, Identity Card issued by Embassy of India in Kathmandu.
An Indian national do not need visa to enter into Nepal. Most nationalities can issue a visa on arrival to Nepal but travelers from other countries like Nigeria, Ghana, Zimbabwe, Swaziland, Cameroon, Somalia, Liberia, Ethiopia, Iraq, Palestine and Afghanistan need visa to be obtained before travel.
Various lengths of stay tourist visas can be purchased. If you want to obtain a visa on arrival, you will need to fill in a landing card, (most airlines provide these before landing in Kathmandu, if not, they will be available in the airport) pay a fee (cost differs depending on your length of stay) and provide a passport photo so don’t forget to bring one in your hand luggage to present to the immigration officers. Visa fees are as follows:
US$ 25 or equivalent convertible currency: Multiple entry for 15 days
US$ 40 or equivalent convertible currency: Multiple entry for 30 days
US $ 100 or equivalent convertible currency: Multiple entry for 90 days
(A tourist can stay for a maximum of 150 days in a visa year)