Just a month after celebrating 50 years of touring car racing at Symmons Plains, a $7.35 million deal has been struck to keep the Supercars coming back until 2023.

The Tasmanian Government announced the renewal that includes $5.6 million to secure the event plus $1.75 million for safety and amenity improvements at Symmons Plains.

Premier Will Hodgman said the annual Supercars round attracts about 55,000 people, including over 7500 interstate visitors who stay for an average of four nights and inject about $6.4 million into Tasmania's economy.

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"The Supercars are a major drawcard on Tasmania's events calendar. It brings thousands of people to Tasmania who get to enjoy our world-class hospitality and showcases our state to over 1.2 million viewers around Australia," Mr Hodgman said.

"The Tasmanian Government has been committed to developing a broad ranging events calendar to encourage visitors to explore every region of Tasmania, and the Supercars' round shows off the North of our state like no other."

Supercars Australia chief executive Sean Seamer also welcomed the partnership extension.

"Supercars and motorsport have a rich history in Tasmania with some of the most knowledgeable, passionate and devoted fans in the country," he said.

"It is fantastic to be able to confirm to them that Supercars will continue to race live at Symmons Plains."

A three-day crowd of 54,926 attended this year's event.

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