In it, but not of it. TPM DC

Is Obamacare's Individual Mandate Really The Largest Tax Hike In The History Of The World? (CHART)

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We used the Treasury Department's four-year data on the revenue effects of large tax increases signed by Ronald Reagan, George H.W. Bush and Bill Clinton; along with CBO projections of the revenue effect of the mandate adjusted for its GDP projections during the mandate's first four years.

The mandate is tiny by comparison. Not, as Scott Walker warned, a "massive tax increase on the people of Wisconsin and America."

As others have noted, even if you include the sum total of all the revenue-raising provisions in the ACA -- and there are many taxes in it -- it's still smaller than the Reagan, Bush and Clinton tax increases.