However, Ministry of Business Innovation and Employment (Mbie) advice on ACC levies, which was released this week, recommended even deeper 17 per cent cuts that would have saved workers and businesses $477 million a year.
Mbie said even with ACC's proposed cut of 12 per cent, the corporation's funding position would be $5.5 billion higher than needed to cover claims.
"This would represent a significant opportunity cost and revenue transfer from levy payers. Higher levies required by this option are likely to negatively impact on the Government's priorities for economic growth and reducing costs for businesses."
Labour's ACC spokesman Andrew Little said the Government's decision not to cut levies was driven by "its desperate bid to achieve its much-hyped 2015 budget surplus".
Mbie's reduction would have meant an extra $125 year in the hands of someone on the average wage "and goodness knows how much for businesses", said Mr Little.
Higher than necessary ACC levies would have little effect on a real Government surplus, "because they can only be spent on accidents and injury prevention", he said.