Sale Allocation Method

Reporting & tax
1

Good day all,

I have queries re the Sale Allocation Method. I understand re the choices presented as below when I produce CGT report:

First In, First Out
Last In, First Out
Maximise Gain
Minimise Gain
Minimise CGT

But what I do not understand is what the broker use at the time when I sell my shares (I use CommSec). As these options are not presented for my choosing when I sell shares.

So for example, if I choose “Last in First out” during generating CGT report in Sharesight, how do I make sure that CommSec is doing the same thing?

Thank you all for your insight.