A question perhaps to help anybody else who finds themselves in this situation... If one doesn't have the cash to prepay the taxes, where do you find a short-term lender for this? Let's say your RSUs are worth $1M and you need to pay $220k in taxes in March, but you won't be able to sell the shares until a few months later. In theory the $1M in public company stock seems like a fine collateral. But in practice, a rec…
Paying taxes on phantom income is extremely risky. As you described, if there is a gap between the tax event and the liquidity timeframe, the value might disappear and you end up paying taxes on money you never had and never will have. A lot of people have lost everything on this.