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 It's not 50%

You pay your marginal rate on 50% of the gain

Our rate is lower than USA currently  
 This.  

Details matter friends. 
 Yep. In the new budget, if you earn over 250k the inclusion rate has been bumped to 2/3. 
 I’m confused. Top rate in U.S. is 37% 
 If u have 100k in gains

Only 50k is taxable

If your marginal rate is 20%

You owe $10k in taxes in total on the 100k gain  
 On 100% of the gain. 

$100 gain = $37 of tax

$100 gain * 50% = $50 taxable dollars * your income tax rate = amount of tax

Thus, if your tax rate is 45% then $22.5 of tax 
 Not on capital gains. I believe you’re thinking income.