Unrealised gains
But HMRC already do tax unrealised gains - look at the pensions of those earning >£120k : get a bonus/increment and the projected pension at age 67 is taxed right now. Even if you are planning to leave earlier.
These bills can be >annual salary and end up being paid out of the pension pot right now (scheme pays).
I know ordinary (well paid) people having to take out second mortgages to cover these.
And don't forget the black hoe of HMRC & NI between 120k and 180k where marginal rate of tax is ~60%
Biting the hand that feeds IT
