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Why is RSU tax basis based on remaining shares after shares are witheld?
Here is how it should look: 100 shares of restricted stock (RSU) vest. 25 shares sold to pay for taxes. W2 (and probably paycheck) shows your income going up by 100 shares worth and your taxes withheld going up by 25 shares worth. Now you own 75 shares with after-tax money. If you stop here, there would be no stock sale and no tax issues.  You'd have just earned W2 income and withheld taxes through your W2 job. Now, when you sell those 75 shares whether it is the same day or years later, the basis for those 75 shares is adjusted by the amount that went in to your W2.   So if they were bought for $20, your adjusted basis would be 75*$20.