Not really. RSU’s don’t have a “notional initial value” for public companies; if you get them, you pay tax on the number of RSU’s you got times the stock price at the time you get them. Your vesting schedule will just say, “X units of ABC on 5/1/20” with no dollar figure.

Brokerages will typically set things up so you can automatically sell enough shares to cover your tax liability as soon as they vest.

Typically you have to amend your cost basis on your tax return for this to actually work, for some stupid bureaucratic reason. Probably a conspiracy to make people who get equity compensation buy the more expensive version of TurboTax.