A new campaign is being launched to urge Opposition Leader Bill Shorten to stage another retreat on a major budget policy, as older Australians intensify their warnings of a hit to retirement incomes from a $55.7 billion revenue increase.

The new alliance, which claims up to 200,000 direct members, is vowing to intensify its campaign in the lead-up to the next federal election to warn voters about the impact on their household budgets from the Labor plan to alter tax rules on share dividends.

The Alliance for a Fairer Retirement System is acting on a survey of its members that found two thirds believed the Labor policy remained unfair despite attempts to soften the impact on pensioners.

“We’ll keep fighting to change it. We’re not going to give up because we owe it to our members to do this,” said Ian Henschke, the chief advocate at National Seniors Australia.

The spokeswoman for the new alliance, Deborah Ralston, said the voters who were likely to pay for the Labor policy were “not high-flyers” and included small business owners who were counting on the dividend rules in their plans for retirement.