I meant increases in offered/negotiated salary. A marginal dollar of salary gets taxed the same way as a marginal dollar of vesting shares, so discounting one in the offer because of taxes makes sense if you discount the other in the same way.
You shouldn't trade away a dollar's worth of shares for 60 cents more salary just because of taxes.
You shouldn't trade away a dollar's worth of shares for 60 cents more salary just because of taxes.