A Greens threat to move a motion of no-confidence unless the Liberals divulge the sources of campaign donations has been labelled a "stunt" by Tasmanian Labor.

The Greens have pledged to move no confidence in the Liberals at the earliest opportunity after Saturday's election unless Premier Will Hodgman releases details of the political donations the party has received.

Greens leader Cassy O'Connor said the scale of the Liberals' campaign advertising, coupled with the way their gambling policy has changed, shows clear influence by the gaming industry.

She said the Liberals needed to come clean on how much money they had taken, and from whom.

"But in the absence of those details, we have to take a stand," she said.

"Whether it's a majority or a minority Liberal government after the next election, we will move no confidence in the Liberals on the first opportunity, on the first day."

"This election is being bought, via millions of dollars flowing into the Liberal party from the gambling industry.

"Our democracy is being corrupted and the Hodgman Liberals are a willing party to that."

Cassy O'Connor (left) has called on the Liberals to release details of their political donations. ( ABC News: Ellen Coulter )

Ms O'Connor said the Liberals' "policy backflip" on gaming policy would deliver to industry players a "$250 million windfall after the election".

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"If the Liberals can clear the air over the question of corruption, we may have a different view," she said.

But Labor will not support a no-confidence motion being threatened by the Greens, in the event Saturday's election delivers a Liberal minority government.

"It is just a stunt in the lead-up to the election," Labor's shadow treasurer Scott Bacon said.

"We don't think the Tasmanian people want to go back to another election when we've still got five days to go in this election."

Analyst declares this use of no-confidence 'unprecedented'

Political analyst Richard Herr said the Greens' threat of a no-confidence motion did not appear to be a political play.

"I don't think this is about minority or majority government, because they've made the point they'll bring it on either way," he said.

"So really what they're trying to do is highlight the amount of money that's coming into the state to support poker machines.

"And they believe this needs to be highlighted in some dramatic way.

"What is unprecedented is for a party to use this as a sort of campaign focal point, to draw attention to what they see as as major issue in the campaign."

Liberals tipped to be pleased with Greens' threat

Political analyst Kevin Bonham said far from feeling threatened, the Liberals were probably "very happy" with the Greens' announcement.

"The Liberals can use it to say that this is evidence that minority government will be unstable," he said.

"I think the Greens are having a bit both ways here, saying minority governments can be stable, but they are also threatening to use their power in a minority government situation to attempt to bring down one of the parties."

Mr Bonham said there was a risk wavering voters would baulk at a whiff of instability, and support the Liberals instead.

While Labor is ruling out supporting the Greens' no-confidence motion or putting forward one of its own on day one, there has been no ongoing commitment.

If the Liberals fail to win the 13 seats needed for majority they could find themselves in a fraught position.

"If the Government were to continue in minority, it would basically be a government in name only because there would be so many issues where it would not have support on the floor of the House," Mr Bonham said.

Treasurer Peter Gutwein (C) with Premier Will Hodgman at the Tasmanian Liberals gaming policy announcement press conference. ( ABC News: David Hudspeth )

Liberal leader Will Hodgman said he did not accept the premise that "millions" had been donated to the Liberals by the gaming industry, but that he would not be disclosing political donations figures in the election campaign.

"What we have seen here is what I've been predicting all along; there will be only one minority government, a Labor-Green one," he said.

"If anyone is thinking of voting for Labor, knowing that they cannot win majority, what will inevitably happen is [what] the Greens are now revealing, in all its ugly glory, is another minority government."