WASHINGTON — Ending a climactic fiscal showdown in the final hours of the 112th Congress, the House late Tuesday passed and sent to President Obama legislation to avert big income tax increases on most Americans and prevent large cuts in spending for the Pentagon and other government programs.

The measure, brought to the House floor less than 24 hours after its passage in the Senate, was approved 257 to 167, with 85 Republicans joining 172 Democrats in voting to allow income taxes to rise for the first time in two decades, in this case for the highest-earning Americans. Voting no were 151 Republicans and 16 Democrats.  Read more