Tax Center: ISO Tax Returns

I received a notice (CP2000) from the IRS stating that, according to last year's tax return, I owe money for the cashless exercise of my stock options. I thought I paid all the taxes through withholding at exercise. How do I respond? This is premium content

You made this mistake because the stock sale at exercise does not generate any gains. The full spread between your exercise and sale prices was added to your W-2, and taxes were withheld at exercise, so you thought you did not need to report the sale on Schedule D of your Form 1040. However...
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