I wanted to find out how much a stock's price could fall to between today and once the 50% Capital Gains Tax discount kicks in
Assuming you are in the 45c tax bracket I believe the formula is
Original price you bought stock x 1+ (% price has increased by x 70.97%) = $X
eg you buy BHP for $30 last month and todays price is $40. If you wait another 11 months, then the capital gains tax break even price is $37.09. That is, you pay the same Capital Gains Tax selling today at $40 as selling in 11 months time for $37.09, ceteris paribus.
If you are in 37c tax bracket, amend 70.97% to 77.30% in the formula