- Usually company will deduct at source. This will show up in your 26AS as TDS
- US and India have DTAA Double Tax Avoidance Agreement. It will be deducted only once.
- You generally have two options -
A. exercise option and sell the shares
B. exercise option and hold the shares
In both, option A and option B, taxes need to be paid. If you choose option A, you will get the cash after all deductions like tax and transaction fee.
If you choose option B, you will need to pay tax by two methods - sell enough shares to cover for the tax (company facilitated) or pay the tax by yourself.
People sometime go for option B if they want to hold the Shares for a year or more for LTCG gains which is taxed at a lower rate than income tax.