To give a brief history, I am Indian citizen based in India and I worked for a technology start-up in India, it was a US based company which had its branch office in Hyderabad, India. Company was not public and I had purchased shares in employee stock options. Now this company is getting sold to another US based company and they are paying off all the shareholders.
My question is :
What is the tax implication of this transaction in US?
What form do I need to fill?
Is the tax applicable for full capital gain?
As I need to pay taxes ( 30% ) in India, is there any way I can minimize my tax liability in US?
I live in India, and I have never lived in US.