Bonus shares received

Bonus shares are shares which an existing share holder gets without paying anything extra.

  When Taxable

In this case capital gain is computed when the bonus shares are actually sold .

COA

Cost of acquisition (COA) of bonus shares is nil (as nothing paid)

However , if these bonus shares are allotted before 1/4/1981, then there Fair Market Value as on 1/4/1981 is to be taken, (even though their actual cost is zero) 

QUESTION 1

Mr A purchased 20000 shares of 15 each on 10 April 2015
He is allotted 3000 bonus shares on 15 April 2015
He sold all 23000 shares on 15 Oct 2015 @ 20/shares

Q2

Mr A purchased 6000 shares of 10 each on 10 April 1979

He is allotted  3000 bonus shares on 15 April 1980

FMV of shares as on 1/4/1981 was 40/Share

He sold all 9000 shares on 15 Oct 2015 @ Rs 500/shares  

CII for 1981-82 was 100 and 2015-16 WAS 1081