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WATCH OUT is what that means. If your co. is withholding option sales at 25%, you could owe significantly more taxes if you cross into the 33 or 35% rates. You need to figure your income tax WITHOUT options FIRST. Then add the sales afterwards to see the true marginal tax.
EX: You make $200K without options. Your options are sold and taxes at a flat rate of 25%. You sell $400K of optionns and $100K is withheld. However, add $400K on top of the $200k and the net real taxes are $140K at 35%. You send her the check based on the standard withholding, but you are in the hole $8K for every $100K you sell..... good luck