German Economy Minister Robert Habeck on Monday criticised sticking to what he called the country's "inflexible" debt brake and took a swipe at Finance Minister Christian Lindner on prospective subsidy cuts, saying it was "all just talk".

The comments laid bare strains in Chancellor Olaf Scholz's ruling coalition after a court ruling last week that wiped 60 billion euros ($65 billion) from the federal budget sent the government scrambling for alternative sources of funding.

Habeck, from the pro-spending Greens, has warned that the ruling could severely impact Germany's ability to support its industry through a green transition and keep jobs and value creation from moving abroad.

He has pointed to other countries, in particular the Inflation Reduction Act in the United States, as examples of governments helping industry stay competitive.

But Lindner, from the fiscally conservative FDP party, is opposed to tax rises and loosening spending rules while the government assesses the extent of the fallout from the court ruling during negotiations for next year's budget.

Asked about Lindner's assertion that the government would have to achieve more with fewer subsidies, Habeck said; "That's why it's all just talk. The reality is different."

"Where do you want to cut 60 billion in social benefits? That dramatically misses the drama of the situation," he told Deutschlandfunk radio.

Habeck said he was not proposing to abolish Germany's constitutionally enshrined debt brake but said "it is inflexible". He pointed to the lack of growth in Europe's largest economy and the challenges of high inflation and high energy prices.

The finance ministry declined to comment. Lindner had over the weekend warned there would now be a lack of new government funding to support economy and infrastructure.

"The short-term consequences are hard. In the long term we can gain advantages. We are now being forced to modernize the economy with fewer public subsidies," he told the Bild am Sonntag newspaper.

The court ruling, which said the government's move to transfer unused pandemic funds towards climate initiatives and industry support was illegal, has boosted the resurgent opposition CDU/CSU alliance, which brought the lawsuit.

Sebastian Brehm, a finance spokesperson for the CSU, criticised what he called Habeck's "unbearable insults" towards the opposition and the constitutional court.

"Because it is not the ruling of the Constitutional Court or the lawsuit by the CDU and CSU that endanger the economy and jobs," he said.

"Rather, it is the unsound and unconstitutional budget policy of the federal government and the (three-way) coalition. You alone are responsible for the consequences."

($1 = 0.9168 euros) (Reporting by Markus Wacket and Christian Kraemer; Writing by Matthias Williams, Editing by Miranda Murray and Ed Osmond)