Centre Alliance is working through its negotiations with the Morrison government over its $158 billion tax package, which could come down to a coalition commitment to lower gas prices.
Centre Alliance - which has two votes in the Senate - wants measures to reduce gas prices and expects its negotiations with the government to be finalised within days.
Senator Rex Patrick says the minor party is confident of a positive outcome.
"But (we) note that the devil is always in the detail and we are still working through the detail," he told AAP on Wednesday.
"We anticipate a package of solutions which include both long and short term options."
Centre Alliance supports changing the Australian Domestic Gas Security Mechanism to ensure a surplus of supply in the market to reduce prices.
"We are also interested in increased transparency measures that will enable businesses to be better informed when negotiating contracts with gas companies," Senator Patrick said.
He says other measures are being considered but the minor party is unable to reveal such details.
"We note that Resources Minister Matt Canavan has foreshadowed a prospective gas reservation policy which Centre Alliance would support."
While Senator Patrick and his colleague Stirling Griff agree the tax package will give the economy much-needed stimulus, they are also concerned the benefits could be absorbed by high household energy bills.
The government only needs the votes of four of the six crossbenchers to get its three-stage package through the Senate when parliament returns next week - assuming Labor isn't on board.
With Cory Bernardi already onside, Senators Patrick and Griff will be crucial as the coalition also tries to woo One Nation's two votes and Jacqui Lambie.
The opposition backs the first stage of the plan, which will mean extra cash for low- and middle-income earners when they file their tax returns in the coming months.
Labor leader Anthony Albanese says the government is being difficult by not negotiating with his party.
"It's the government that are threatening to withhold tax cuts from people. We're saying - pass them, pass them quickly and pass more of them," Mr Albanese told 5AA radio on Thursday.
"We're not ideologically opposed to tax cuts for all workers, in fact we're saying it should happen."
Labor will only support the second stage, which is due to kick in from 2022/23, if the government brings it forward to the coming financial year to give the economy an extra boost.
The second stage will top-up a low income tax offset and mean more people - earning up to $45,000 instead of $41,000 - will get a 19 per cent tax rate.
Labor also wants the government to defer legislation on the third stage, which will flatten the tax rate from 32.5 per cent to 30 per cent for people earning between $45,000 and $200,000 from mid-2024.
The government has ruled out splitting the package.
Acting treasurer Simon Birmingham says Australians had made their view clear on the package when they returned the coalition to government on May 18.
So far the only crossbencher to back the coalition's full tax plan is Senator Cory Bernardi, a former Liberal.
Australian Associated Press