Australia's 2035 climate target to reduce greenhouse gas emissions could be a single figure, rather than a range, treasury officials have revealed.

The hotly anticipated number is expected to be released later this week and will help the Labor government and industry better plan the nation's shift towards net zero emissions.

Early advice provided to the federal government by the Climate Change Authority suggested a reduction in emissions of between 65 and 75 per cent by 2035, leading to speculation that a range would be set in place as the target.

But Treasury officials fronting a parliamentary inquiry on Tuesday said they had only been asked to analyse the economic impacts of one number as a climate target, rather than multiple options.

"The modelling that we have done has a point est

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