As stated by the New York Times:
Starting in January, the health care law will require workers to pay an additional tax equal to 0.9 percent of any wages over $200,000 for single taxpayers and $250,000 for married couples filing jointly.. the taxes came with “a shockingly inequitable marriage penalty.” Read the entire article here.
As “shocking” as the Medicare withholding tax Marriage Penalty is in Obamacare beginning January 1, 2013, it is just the tip of the iceberg. The really ugly Marriage Penalty will hit in the premiums middle class taxpayers must pay. See my article here.