thermionic,IMHO, it would depend on how your tax returns have...

thermionic,

IMHO, it would depend on how your tax returns have been prepared in the past. Accruals, or Cash basis. Once you have chosen a method, you cannot change it unless you get prior approval form the ATO from memory.

If your tax returns have been prepared on an accrual basis, then the date that you have entered into a contract to either buy or sell your shares, would be the date to be taken in consideration because that will be the date that a liability to pay or to receive money was created.

If yor tax returns have always been prepared on a cash basis only instead, then the date that you paid for the shares, and the date that you will receive the cash from the sale of them, IMO would have to be the date that would be taken into account. Hence why, from memory, the T+3 has been applied previously.

I suggest though that you get in touch with your accountant and ask him all about it. Not knowing your full position, it is hard to suggest anything.

As for the BPT part, I fully agree with you.

Cheers