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28 July 2023

When writing options, my understanding is that the premium generally triggers a CGT event D2 at that time, during the taxation year in which the event occurred. If option is exercised/assigned then the CGT event D2 is disregarded and the amounts are taken into the cost basis of the later CGT event.


I have 2 questions:

  • If the option expires, then is the outcome that the original CGT event D2 (in relation to the premium received) remain and counted to the taxation year that the event originally occurred?
  • If the option is exercised/assigned and the CGT event D2 is disregarded, does this mean that in the case where the option writer is forced to buy shares, the the cost basis of the shares would be reduced by the premium received?

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2,300 views
2 replies

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Most helpful reply

AriATO(Community Support)Community Support
2 Aug 2023

We've heard back from our technical team @optiontrader.


You were right that CGT event D2 happened when you grant/write an option. If the option expires, you made a capital gain equal to the premium received, as the cost base of that is zero.


When the option is exercised, CGT event D2 is disregarded. This means that the premium is used to adjust the cost base (CB) or reduced cost base (RCB) of the asset acquired or disposed. This table shows the adjustment to CB or RCB. As you wrote a put option, you acquire the asset, so you reduce the CB by the premium received, see grantor in item 2 in the table. If you wrote a call option which is exercised, see grantor in item 1 of the table. Your capital proceeds includes the premium received.



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Most helpful reply

AriATO(Community Support)Community Support
2 Aug 2023

We've heard back from our technical team @optiontrader.


You were right that CGT event D2 happened when you grant/write an option. If the option expires, you made a capital gain equal to the premium received, as the cost base of that is zero.


When the option is exercised, CGT event D2 is disregarded. This means that the premium is used to adjust the cost base (CB) or reduced cost base (RCB) of the asset acquired or disposed. This table shows the adjustment to CB or RCB. As you wrote a put option, you acquire the asset, so you reduce the CB by the premium received, see grantor in item 2 in the table. If you wrote a call option which is exercised, see grantor in item 1 of the table. Your capital proceeds includes the premium received.



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Taxation of premiums when writing options | ATO Community