The Green Party believes a change in the way ACC is funded could free up about $15 billion for the Government to spend elsewhere.
The Greens' ACC spokesperson Kevin Hague says returning to a pay-as-you-go scheme would mean ACC would not need to hold as much money in reserve as it now does.
Such a scheme would mean the corporation would only need to collect the money necessary to cover compensation costs in each year rather than putting money aside to cover the long-term costs of injuries.
Mr Hague says ACC has about $20 billion in reserve but a pay-as-you-go scheme would only need about $5 billion.
ACC Minister Judith Collins has not ruled out the Government adopting the pay-as-you-go approach.