The Abbott government is on the cusp of delivering its most central election pledge with the repeal of the carbon tax set to be the first order of business for the newly configured Senate sitting from Monday.
Its fate, and that of the mining tax, now appears sealed but a batch of other government measures, including much of its budget, remains hostage to a populist upper house dominated by a record number of crossbenchers.
After almost five years of the most acrimonious public debate, the axe will finally fall on the two-year-old carbon tax, within days handing money back to households and business and releasing what Mr Abbott once characterised as a ''python squeeze'' on the Australian economy.
Its demise has the support of the Palmer United Party's four-vote bloc, South Australia's Family First senator Bob Day and NSW Liberal Democratic Party senator David Leyonhjelm.
Labor and the Greens will vote against the repeal.
They will be joined by existing crossbench senator Nick Xenophon and possibly by DLP senator John Madigan who are likely to vote against a plan to guillotine debate and rush to a vote. Senator Xenophon said it was a bad sign that the new Senate would have an important debate truncated at its first sitting.
But PUP leader Clive Palmer confirmed he would support the government's planned suspension of standing orders to bring the repeal bills on for a vote this week. A Labor-Greens insistence on sticking to a previous timetable of no debate until July 14 was pointless, he said.
''After all this time, we know absolutely where everyone stands, we don't need any more inquiries or delays, we just need the vote,'' he said. ''We think the carbon tax has been well and truly discussed over the last five years.
''As I foreshadowed, we will be moving an amendment tomorrow [Monday] to ensure the savings from repealing the carbon tax are passed on to consumers.''
Environment Minister Greg Hunt appealed on Sunday to the opposition to recognise the government's clear mandate and allow the matter to proceed.
''The first thing I'd say to the ALP is - you can vote against it but please don't stop the Senate voting on it,'' he said.
With Lisa Cox