Treasurer rejects Greens super plan

Treasurer Joe Hockey says it's very hard to take the Greens seriously on any economic policy -including superannuation.

Treasurer Joe Hockey has dismissed a new superannuation policy being floated by the Australian Greens that imposes more tax on high earners while lowering the rate for the lower paid.

The Greens claim the "super wealthy" are avoiding hundreds of thousands in tax using superannuation loopholes.

But Mr Hockey says it's very hard to take the Greens seriously when they refused to back indexation of the fuel excise.

"So how can you take the Greens seriously on any economic policy?" he told ABC radio on Thursday.