Generally, bonus shares will be deemed to have been acquired at the same date as the original shares. Section 130-20 of the ITAA 1997 INCOME TAX ASSESSMENT ACT 1997 - SECT 130.20 Issue of bonus shares or units See item 1 in the table. Example Bart has some BBB shares which he purchased on 1 July 2017. On 1 July 2019 BBB issues Bart with 100 extra shares under the Bonus Share Scheme. If Bart sold these shares on 2 July 2020 he would be deemed to have held them for 12 months and would be entitled to the 50% CGT discount. Note that there a complexity with working out the cost base on bonus shares. Tax advice is needed in any case.