There are two types of Capital Gains that exists in the unlisted market.
1. Long-Term Capital Gain.
If you sell your shares after 2 years, then you will have to pay Long-term Capital gain on unlisted shares.
LTCG is 20% + Indexation benefit.
2. Short-Term Capital Gain
If you sell your shares within 2 years, then you will have to pay Short-term Capital gain on unlisted shares.
Short-Term Capital Gain is added in your Income. So, as per individual tax slab you need to pay capital gain tax.
How much Capital Gain needs to pay after listing?
Post lock-in it will be taxed at listed rates, if sold through exchange. Holding time will be since purchase date
For any other tax clarification, please feel free to mail us firstname.lastname@example.org.