The striker has put pen to paper on a deal which replaces the five-year contract he signed when he arrived from Crystal Palace for £8.6million in the summer of 2006.
. The deal ends speculation about Johnson's future after several months of claims that he was unhappy in the north and wanted to return to his London roots.
Everton chairman Bill Kenwright has acted swiftly, aware of the player's valuation now he is back in the England squad.
He told the club's website, www.evertonfc.com: "We are absolutely delighted. It is fantastic news for Evertonians.
"This deal further underlines our commitment to keep our best players at our club.
"We continue to build for the future and Andrew Johnson is very much part of that future."