Treasurer Scott Morrison who has vowed to stick with the government proposed changes to superannuation to make savings that are opposed by some Liberal MPs, has warned taxes could rise if the measures do not pass.

He also said the changes will help reassure ratings agencies of Australia's AAA status after Moody's, Standard & Poors, and Fitch Ratings warned the government and the Senate that Australia's AAA credit rating will be threatened if budget repair is derailed in the next parliament.

"The changes we've made to superannuation do a number of things they make the superannuation system more fair and more sustainable and they make a significant contribution to bringing the budget back towards balance.

"The changes we've made to superannuation do a number of things they make the superannuation system more fair and more sustainable and they make a significant contribution to bringing the budget back towards balance." Alex Ellinghausen

"Now that obviously has positive implications for reassuring ratings agencies but alone that measure will not be sufficient, I think, to address that concern. We need to go far beyond just that single measure there are many other measures that are in the budget that go towards completing that task.

"But that is why we are pursuing these changes not just in superannuation but in the welfare system and across all areas of budget expenditure. We need to ensure we continue to get this under control otherwise the deficit will be higher, the debt will be higher, more taxes will inevitably rise. This is not something the government is interested in doing," he told Sky News.