In Europe, you pay taxes, as soon as you get them.
Example: you're granted 1 share today to vest in 1 year. In 1 year the share is worth 100, it vests and you pay PAYE in this (it can either come from your salary, or by selling the stock). If the stock rise to 150 and you sell it after, you pay CGT on 50.
Huh? Can you actually keep the stock and give revenue the money out of your post-tax? I wasn't aware that was possible.
The one loophole is to sell with 4 weeks, that is CGT exempt.