Ann: Trading Halt, page-284

you can't avoid capital gains (unless you lose money or trading through a company). If STX takes us over (or at least 80%) we may get roll over relief which means you will have STX shares but a capital gains event wont occur. But the capital gains event still occurs when you sell the stx share be it the days after you get them or 30 years down the track. The gain will be based on your purchase price to TPD and your sell price of STX. Any 13 month hold discount is based on when you bought TPD.

note I am not a tax advisor but did ask this question from my tax advisor during the NWE takeover.