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(far from an expert, but have some experience with RSU and withholding rates)
Usually high earners would have 45% income tax and 2% NI applied, being the rates due on earnings at the upper limits of regular taxation.It is possible someone has gone 45% tax, 8% NI as a default, as they are "normal" rates (on a payslip) but not at the same time (45% is for annual income over ~125k and 2% NI is applicable over ~£50k)
we used to err on the side of caution and "over withhold" on vestings if they were close to a new bracket, the difference would be paid out when it was actually payrolled.I know this isn't directly answering your question...
Tenderloin
t-v
DethBeard
@Velocio
Tax withholding on shares works out to be 53% of the gross value of the shares (before fees / deductions, so more like 55-58% if it is applied post-fees)... does that sound right? Is it the higher rate income tax and additional National Insurance?