Maori Party co-leader Pita Sharples said the party was negotiating for higher handouts and other measures to help low-income families in return for backing the emissions trading scheme.
He refused to give details, but his comments suggested he wanted a one-off boost to cover the initial price shock when power, petrol and diesel come under the scheme on July 1.
"We're still negotiating that one, but we basically got heard at least that there should be a slight increase for the benefit ... during this period, beyond what it is now."
Climate Change Minister Nick Smith said negotiations on helping low-income families cope with extra costs were continuing, but there had been no agreement on benefits going up.
A spokesman said later there would be no increase beyond the usual inflation adjustment on April 1 each year. The 2011 adjustment would take into account power and fuel increases after those sectors were brought into the scheme on July 1 next year.
The ETS is expected to add an extra $3 a week to household power and fuel bills about half the increase under Labour's stricter scheme. At the time of the May 28 Budget, a $3-in-the-hand rise in benefits and national superannuation would have cost $54 million a year, though beneficiary numbers have since risen significantly.
Labour leader Phil Goff said the proposed scheme did not do enough to cut emissions, and Labour would change it when it returned to government.
Labour is angry that National struck a deal with the Maori Party instead of seeking broader political support. "They could have reached agreement with us. They chose not to. We certainly believe what is being proposed in its current form is wrong. That means the scheme will again be subject to change."
Mr Goff also said the scheme could cost taxpayers $1.6 billion over the next four years, four times the $400m predicted by Dr Smith.
Taxpayers must pick up the shortfall between what polluters pay for their emissions and New Zealand's overall Kyoto liability.
Prime Minister John Key rejected claims the Government had acted in bad faith, and said its position was made clear to Labour all along. He still hoped broad agreement could be reached as the scheme went through a select committee before becoming law.
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