I have a question regarding RSUs awarded to me from my US employer. I have X RSUs that vest quarterly. They automatically vest and then a notional amount is automatically taken to cover my tax and national insurance obligations. At the point they vest there is a window shortly after in which I can sell them. The value of these RSUs invariably decreases at the point I am in a position to sell them from the point at which they vested and tax was taken from them. Assuming I sell them at the value lower than the point the tax was taken from them, can I reclaim tax in any way?