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(Menlo Park, CA) Facebook’s CEO is facing a big tax bill this time around to the tune of more than a billion dollars.

The bill stems from Mark Zuckerberg’s decision to exercise a stock option and buy more than $60 million in Facebook shares when the site went public.

The IRS will treat those stock options as income, which translates to roughly $2 billion.

And since Zuckerberg’s tax rate is close to 50%, that comes out to roughly $1 billion.