“How is the capital gains tax is calculated on the shares bought 10 years ago”

A. 10 years ago, there was no long term capital gains tax on shares.

It was introduced in the financial year (FY) 2018-19 — 10% on the gains (profit).

So if you bought a share 10 years ago, there will be no tax calculation till FY 2018-19.

Gains made after 2018-19 will be taxed at 10%.

Do note: shares are only taxed when selling. Simply holding a share does not attract any taxes.

Also, in every financial year, up to Rs 1 lakh gains from equity investment (shares and mutual funds) is tax-free.