Ontario's Liberals waded into the looming federal election Thursday, accusing Prime Minister Stephen Harper of abandoning workers in the province by refusing to co-operate on a new provincial pension plan.

Ottawa has warned the province it will not make any legislative changes to treat the proposed Ontario Retirement Pension Plan like the Canada Pension Plan, and would provide no federal help to collect contributions or administer the scheme.

"This is a cynical, partisan stunt, executed on the eve of a federal election campaign," said Ontario Finance Minister Charles Sousa.

Two-thirds of Ontario workers do not have a workplace pension, and Harper knows that CPP payments averaging $6,900 a year will not provide adequate retirement income, added Sousa. However, Harper will get a pension of $191,000 a year when he leaves office, he said.

"What he's telling you is fend for yourself, but not him," said Sousa. "He's going to have a gold-plated pension plan that's going to provide tremendous benefit for future years for himself, but he's denying that very right to the people of Ontario."

Responding to Sousa's accusations, federal Employment Minister Pierre Poilievre said Ontario's Premier Kathleen Wynne and Liberal Leader Justin Trudeau are bent on increasing taxes.

"We are committed to doing everything possible to stop the massive Trudeau-Wynne payroll tax hike on middle-class families," said Poilievre. "We will not help Justin Trudeau and Kathleen Wynne implement their dangerous scheme to take money from workers and their families, kill jobs, and damage the economy."

The federal government already has a co-operative agreement with the Quebec Pension Plan and it made legislative changes to the Income Tax Act in 2010 to allow higher contributions to the Saskatchewan Pension Plan, noted Sousa.

The Harper government's refusal to co-operate with the proposed pension plan is "a slap" to Ontario, Sousa said.

Ontario's new pension plan would require contributions of up to $1,643 from employers and workers in any company that does not have a workplace pension, but exactly who will have to participate is still being worked out. It will be phased in starting in 2017 with larger companies before moving to smaller businesses like corner stores.

Sousa admitted Ontario would face greater costs to set up and administer its pension plan if it can't get the co-operation of the Canada Revenue Agency, but insisted the province will go it alone if there is no change in federal government after Oct. 19. The province would prefer to enhance the CPP rather than implement its own plan, but the Conservatives oppose any increases to CPP deductions.