The Government has agreed to hold a wide-ranging summit as part of its deal with Mr Windsor and fellow independent Rob Oakeshott.
This morning Treasurer Wayne Swan said the forum would not consider the mining tax because it was already the subject of a lengthy consultation process.
But he now says he is open to the idea being discussed at the summit.
“If during that period or around that period we have a tax forum which talks about Henry [tax review], I’m sure there’ll be many people who will want to discuss issues in Henry that we ruled out, they may want to discuss the draft legislation – I’m relaxed about that,” Mr Swan said.
Opposition treasury spokesman Joe Hockey says divisions are already forming in the new government.
“The happy couple have not even left the chapel and they are arguing about the mining tax already,” Mr Hockey said.
“The prenuptial agreement will not last and what we are going to end up with is uncertainty and confusion.”
Mr Windsor says he misunderstood the mining tax issue when he made his comments this morning.
“Well, essentially by me I think we were talking at cross purposes in terms of the review,” he said.
The Greens want the mining tax to revert to its original form, in which miners would be taxed at 40 per cent rather than 30 per cent on their profits.
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