Indian taxation rules while selling vested company (foreign) shares

At the time of sale of shares by the employee, companies whose shares are listed 

STCG- 15%

LTCG- 10% if the transfer of shares gain is more than 100000

At the time of sale of shares by the employee, companies whose shares are not listed 

STCG- use the same income tax slab rate applicable on your income

LTCG- 20%

The capital gain tax would be calculated as a difference between the sale consideration and the fair market value as on the date of exercise of the options.

twenty thousand minus ten thousand. check the slabs applicable for capital gains and apply accordingly.