Tasmanian has welcomed news it will receive an extra $112 million over eight years under an overhaul of GST funding to be announced by federal Treasurer Scott Morrison.

State and territory governments will receive a series of funding boosts totalling $5.2 billion over the eight years to 2026-27, with the Turnbull government promising none will be worse off because of the changes.

"On face value, the federal government's proposal delivers on its commitment that Tasmania would not be one dollar worse off," Tasmanian Premier Will Hodgman said in a statement on Thursday.

"Based on the federal government's modelling, Tasmania may well receive additional funding under the proposal of $112 million over the next eight years with the potential for additional increased funding in perpetuity."

Mr Hodgman said his government would now conduct a detailed assessment of the proposal.

"The Tasmanian Government won't accept the proposal if it's not in Tasmania's best interests," he said.

State and territory treasurers will meet in September to discuss the plan, with a final agreement expected by the end of 2018.