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Tax liability for stocks vested for a H1B visa holder
You're asking whether the shares you sold while being a US tax resident are taxable in the US. The answer is yes, they are. How you acquired them or what were the circumstances of the sale is irrelevant. When you acquired them is relevant to the determination of the tax treatment - short or long term capital gains. You report this transaction on your Schedule D, follow the instructions. Make sure you can substantiate the cost basis properly based on how much you paid for the shares you sold (the taxable income recognized to you at vest).