Tipping is not obligatory just like anywhere in the world. However if you like the service and want to thank them this is another good way to do so. The following is recommended as a guideline:
In Kathmandu 20-50 Rs for bellboys, waiters and porters is appropriate. At the end of a trek, if your group thinks that the staff has done an outstanding job, a group tip would be greatly appreciated. Normally tip is given at the end of the trek and this is best done as group rather than individual. Most groups will give the tips with a bit of ceremony on the last evening to mark the end of the trip. Your Group Leader or guide will advise you in more detail regarding this matter. As a guideline, we recommend that each group member contributes around $ 75 (rupee equivalent) and then it is shared amongst the team.