The five-party government's budget framework negotiations were to have wrapped up on Wednesday, but in the late afternoon Prime Minister Sanna Marin (SDP) said that they would resume on Thursday.
In the meantime, she asked the leaders of two cabinet parties to reach an agreement on emissions taxation, which she said was the last remaining area of disagreement.
According to Finance Minister Annika Saarikko (Cen), "negotiations on the budget will resume when the prime minister reconvenes them. The Centre is ready to approve a climate package in accordance with the government programme," she added via Twitter on Wednesday afternoon.
Ministerial sources told Yle that a budget deal had been reached besides the controversial issue of climate taxation.
Speaking to reporters outside the House of Estates in Helsinki's Kruununhaka neighbourhood, Marin said she had asked the Greens and the Centre to negotiate a one-on-one solution by Thursday morning on how to reduce climate emissions in the so-called effort-sharing sector, which includes transport and agriculture.
The farming industry, which has close historical ties to Centre Party, is one of the few sectors of the Finnish economy where greenhouse gas emissions have not significantly dropped since the turn of the millennium.
Long-running friction
Differences of opinion over Finland's climate measures have long been a source of friction between the two parties in particular. That was seen in the dispute over the use of peat for energy, which led to a long delay during last spring's budget talks.
The smaller Left Alliance has generally backed the Greens' insistence on concrete measures to reach the government's target of national carbon neutrality by 2035, with the two other government parties taking a more middle-of-the-road approach.
Left Alliance chair Li Andersson tweeted on Wednesday afternoon: "Measures must now be found to ensure that sufficient emission reductions are achieved. This is an absolute demand of the Left Alliance. We are confident that we will find a common solution."
Greens chair Maria Ohisalo said that this was a question of the overall credibility of the government's climate plans.
The talks between the two parties on Wednesday evening were being led by Environment Minister Krista Mikkonen of the Greens and former Centre prime minister Juha Sipilä, now chair of Parliament's Environment Committee.