I was part of a startup which sold in 2021. During 2021, I did not work for the startup, but they sent me a W2 for the sale. It appears to be for the sale, however the amount on the W-2 does not match the proceeds I received in 2021. I have read that this number is sometimes offset relative to FMV at time of exercise, etc, but the math still doesn't add up.
Additionally there are escrow holdings causing deferred payments to me in both 2022 and 2023, so I don't even have the final value/gains.
How should I handle the deferred gains, especially when entering cost basis?
NOTE: The deferred gain isn't a set amount (it's tentative) so I can't simply add it to my existing gains.
