But Opposition treasury spokesman Brendan Smyth continues to accuse Labor of hiding figures, while Treasurer Andrew Barr said it would be at least 40 years before anybody's rates tripled.

Mr Smyth was asked on ABC radio yesterday if rates were going to go down for any households under the government's reforms.

''That may be a possibility but we don't know because the government won't make the information available,'' he said.

The Liberals have placed the claim that Labor and the Greens plan to triple household rates at the heart of their bid for power in the October 20 territory election.

Mr Barr said it would be ''the middle of the century,'' before rates bills would triple.

''Ultimately at some point in the future, probably in the middle of the century, rates would be triple what they are today,'' he said.

But Mr Smyth sought to clarify his comments later in the day. ''I think you've got to take it in the context of what I said,'' he said. ''The government's not providing any information to support that [a fall in rates].

Mr Barr said the opposition was being ''deliberately misleading''.