Yes, it is for tax purpose. I need to get a certified copy of my wife's passport to apply for ITIN. I could have done it through Nepal embassy in US, but the problem is she has gone to Nepal and will be returning after a few months.
If it is possible to get a certified copy from embassy abroad, it should be possible from Nepal also.. but we never know..
I am not sure if district administration offices do this. If anybody has any information about this, please share.
I will update how it goes..

Thanks,
ttt