The government has introduced its carbon tax repeal into the Senate for what it hopes is the last time.
Debate is now underway on the package of bills, which passed the House of Representatives on Monday.
The bills and amendments were held up on Tuesday by backroom talks on a list of other bills to be brought on for debate before the Senate rises for a five-week break.
Manager of government business in the Senate, Mitch Fifield, said the government had been frustrated at times in giving effect to its carbon tax repeal election commitment.
The government is still confident the tax will be axed by the end of the week - but the Senate has agreed to sit until the package and four other bills have been dealt with.
That could take days or even weeks.
It is understood the government and Palmer United Party have reached a final agreement over an amendment which would force companies to pass savings on to customers.
That agreement held up the repeal last week.
The government will need three PUP senators, with Motoring Enthusiast Party ally Ricky Muir, and two from four remaining crossbenchers to pass the repeal.
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