Compulsory KiwiSaver and a clawback tax of about 10 per cent upon payout, paid into the New Zealand Superannuation Fund, would cover the rising cost of superannuation, says former Minister of Finance Sir Michael Cullen.
Speaking at a Grey Power Napier and Districts meeting yesterday, the "maturing" 71-year-old superannuate - a recent pacemaker and hearing aid recipient - said family sizes had halved since the height of the Baby Boom and people were living longer, putting pressure on remaining taxpayers.
In New Zealand superannuation was primarily paid for by taxation but, with a general expectation taxes should fall, changing the age of entitlement was "almost the only variable".
"New Zealanders have persuaded themselves that taxes should go down rather than up."
The current Government was "dangling the carrot" of tax cuts even though it was not delivering regular surpluses.
"We have to find answers and these answers need to be fair."
Means testing was ineffective and an incentive for people to leave the workforce.
Lowering the amount paid would place a large number of elderly into poverty, especially with an increasing number retiring in rented accommodation.
Changing the age of entitlement was an obvious solution but older people were more likely to vote so were a powerful political force.
The rising cost of superannuation was already affecting government spending in other areas, including infrastructure, mental health and conservation.
"The real issue from Grey Power's perspective is, will the welfare of young people be affected?"
Treasury modelling showed his proposed tax on Kiwisaver pay-outs combined with compulsory KiwiSaver membership would cover future needs without the need for more general tax.
The pay-out tax would target incentives paid to KiwiSaver members, not members' own savings, he said.
More than 200 people attended Sir Michael's presentation at St Columba's Church in Taradale, which Grey Power president Laurie Jenkin said was a record turnout.
Currently chairman of New Zealand Post, Sir Michael served as Deputy Prime Minister, Minister of Finance, Minister of Tertiary Education, Attorney-General and deputy leader of the Labour Party.
He was architect of the New Zealand Superannuation Fund, colloquially known as the Cullen Fund, which was intended to pay for future superannuation costs, but the National Government suspended contributions in 2009.