Swan unlikely treasurer in Sept: Windsor Independent MP Tony Windsor (L) predicts Wayne Swan won't be treasurer after the September election. ONE of the federal government's key backers in parliament believes Wayne Swan is about to deliver his final budget. Tony Windsor, whose vote has helped keep the Labor minority government in power since 2010, predicts voters will opt for the coalition at the September 14 election. "My guess is he (Mr Swan) won't be treasurer after September," the MP told reporters in Canberra on Tuesday. My guess is that there will probably be a change of government at the next election. There may not be, I've been wrong before. Mr Windsor says he wants to see an end to short-term vote-buying in Mr Swan's sixth budget. Top of his wish list is scrapping the baby bonus, which he says is the worst piece of policy he has seen. Mr Windsor welcomed a 10-year funding plan for the national disability insurance scheme and the Gonski education reforms. "Those two issues are terribly important and they are long-term issues," he said. NDIS, Gonski, those things are long-term policies and have to be sustained economically by the budget. So I think it is responsible. Mr Swan said Mr Windsor's prediction was the least of his concerns. "When I get up every day I don't think about what the opinion polls are saying and what the political commentary is saying," he told reporters. I think about making our country better and stronger for future generations and that's what this budget is about. That's what I'm concerned about. Independent senator Nick Xenophon believes the worst is yet to come. "If people are worried about this year's budget, they should be terrified about the post-election budget next year," he told reporters. I think that's when the awful truth will come out about the state of the nation's finances. Next year's budget would be "a real horror story." Senator Xenophon was sceptical of any 10-year savings forecasts in the budget. Australian Greens leader Christine Milne is disappointed the budget won't support struggling Australians, especially those on the Newstart Allowance. "We think (the budget) was an opportunity to increase that," she told reporters. We can't have a society where the gap between rich and poor is widening. That leads to other social problems.