This will be due to the expiration of the Bush tax cuts at the end of this year and corresponding massive increase in the national debt. In the just the past 3 years, our runaway national debt has soared from $9 trillion to over $15.3 trillion and there are no signs of it slowing down.
In response, President Obama has been openly calling for higher taxes, which means that married couples earning over $200,000 and singles earning over $100,000 may find themselves paying tax rates as high at 62.5%. Sadly, a poll taken in late last year indicates that many Americans appear eager to "tax the rich" out of a sense of making the wealthy pay what politicians say is their "fair share".