Jim Chalmers is claiming the Opposition is flip-flopping on super tax talks as the mudslinging over the controversial proposal intensifies.

The Treasurer has accused the Coalition of shutting the door on negotiations to pass a version of the reforms through the Senate when parliament resumes in August.

His Opposition counterpart, Ted O’Brien, has accused him of doing the same and choosing to deal with the Greens instead.

Mr Chalmers said on Thursday there was “a lot of disunity in the Coalition” on the tax.

“First of all, on my opposite number, one day he said he wanted to have a discussion about it, the next day he said that he didn’t,” he told the ABC.

“There’s a lot of disunity in the Coalition over this.

“They seem to have different views amongst them and different views from day to day.”

Mr Chalmers also said the Albanese government had “been very clear from the beginning we don’t have the numbers in the Senate to pass our legislation on our own”.

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