The average work account levy paid by employers and the self-employed will fall from $1.47 per $100 of income to $1.15.
That would save a typical small business employing seven people on $50,000 each about $1120 a year.
A self-employed person earning $80,000 a year who pays both levies stands to save about $528 a year.
The Government has already said it will allow private insurers to offer cover to employers in competition with the ACC's Work Account, and Dr Smith said yesterday the earners and motor vehicle accounts may be next.
"Over the last three years we had a policy commitment to explore competition in the work account. We've done that hard work, we've made a decision, we're going to proceed.
"If we're privileged to be in government over the next three years we would get that up and running in the work account and would do further work on what choice could be provided in the earners' and motor vehicle accounts."
Any policy to introduce competition in those areas would be campaigned on in the 2014 election, Dr Smith said.
Labour ACC spokesman Chris Hipkins said householders and businesses would welcome the relief lower ACC levies would bring, but "they never should have been paying such high levies in the first place".
"ACC was never in crisis. Nick Smith and the National Party manufactured a crisis in order to justify hiking levies and in order to prepare ACC for privatisation," he said.
Mr Hipkins said National's plan for competition was doomed to fail.