(Bloomberg) -- The top 0.01% of Americans -- fewer than 14,000 households -- received 5.6% of adjusted gross income in 2012, according to data released Wednesday by the IRS that underscore the increasing concentration of income.

It was the biggest share of income clustered at the very top of the distribution scale since 2007. Those in that group had a minimum income of $12.1 million, up from the $8.8 million it took to reach that club in 2011.

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