Boy, there is a limit of amount you can bring. A tourist visa holder can apply for TC of US$ 2000 per person per year only. If the person has immigrant visa, he can get permission from Rastra bank for maximum US$ 5000 only. Back in Nepal, its not only your money...it's also the money of country. So, they don't allow any amount you want to bring with. If the custom discovers that you have more money than permitted on your passport, they can seize it or have to share with the corrupt official