I keep seeing this post today so it might be a good time to remind folks that in the US stock grants and RSUs are considered income, and you are taxed on that income just like other forms of compensation. If you get a grant of stock with fair market value of $1M, you're taxed on $1M of income. RSUs, options, forward exercising, etc. shift around *when* and how you're taxed, but like... stock is not tax-free lol.