Federal Treasurer Joe Hockey says published Treasury Department figures which show low-income families will lose more under budget changes than high-income families are misleading.

The figures, released under Freedom of Information laws, show lower income families will be, on average, $844 worse off.

Middle income families will be, on average, $492 worse off, while those on higher incomes will be $517 worse off.

Mr Hockey has told Channel Nine there is more to the picture.

"I think there is a lot of misinformation around," he said.

"It fails to take into account a range of things, like higher income households pay half their income in tax. Lower income households pay virtually no tax."

The Government is struggling to win support for a number of controversial budget changes, including plans for a co-payment on doctor visits and moves to increase fuel excise.

Voter support for the Coalition has slumped in the wake of the May budget, which critics have described as unfair.

Mr Hockey says the Treasury figures, published in Fairfax Media, fail to take into account pensions, which he says are "substantial payments".

"It also fails to take into account the concessional payments such as discounted pharmaceuticals and a range of other things; discounted transport, discounted child care that goes to lower income households," he said.

"So the information as presented is deliberately misleading and it doesn't present the true state of affairs."

Net effect of budget in 2016-17 Low income $844 worse off

Low income $844 worse off Middle income $492 worse off

Middle income $492 worse off High income $517 worse off Source: Treasury Department

The Treasury data does show high-income earners hit with the temporary deficit levy, a measure which drops off after 2016-17.

It says those earning above $180,000 a year will pay an extra $446 a year in tax, while low income earners will pay just $2 a year.

Opposition treasury spokesman Chris Bowen has told AM the Government had tried to hide these figures.

"Well, I think this data confirms what every Australian already knew, and what the Government has been in denial about," he said.

"This budget has always been patently unfair, and also it confirms this was a deceitful budget."

Mr Bowen says it is obvious now why the Treasurer withheld a table from this year's budget called "Detailed family outcomes", which would have showed the budget's impact on families of different incomes.

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He denies the newly published figures are misleading.

"These are Treasury figures," Mr Bowen said.

He says the figures, as published, only go for one year so do not take into account other budget measures such as the $7 GP co-payment, abolishing the school kids bonus, and cutting the family tax benefit for children aged six years and older.

"These figures are bad enough, but in fact the reality goes even further," Mr Bowen told reporters.

Lobbying for parental leave support in Senate continues

Mr Hockey, meanwhile, is continuing to meet cross-bench senators to try to win their support for major budget initiatives as well as the Government's paid parental leave (PPL) scheme.

Senior Government frontbenchers have not denied reports the scheme has been shelved for the rest of the year while the Government tries to pass the budget.

The Treasurer says the Government remains committed to the PPL, which is due to begin in July 2015, but has not offered when it will be put to Federal Parliament.

"We are not dumping the PPL," Mr Hockey told Channel Nine.

But some Coalition backbenchers and independent senators remain opposed to the policy.

Mr Hockey says he is focused on the opposition from Labor and the Greens.

"Cut us a break here. These guys are all over the shop," he said. "The Labor Party is only opposing (PPL) because of politics."

The Treasurer says he has met with independent senator Nick Xenophon, Family First senator Bob Day and PUP's Tasmanian senator Jacqui Lambie, while he is due to meet senators David Leyonhjelm and John Madigan this week.

"There is a lot of work to do. I'll meet with anyone who is sensible," he said.

"I will meet with anyone who is sensible and the independent senators so far are proving to be sensible, unlike some of the others in the Upper House."