Finance Minister Michel Sapin was speaking in an interview with Reuters and three European newspapers, ruled out negotiating any deal with Google on back taxes, as Britain did in January.

Dozens of French police raided Google's Paris headquarters on Tuesday, escalating an investigation on suspicions of tax evasion. Investigators searched McDonald's French headquarters on May 18 in another tax probe.

"We'll go all the way. There could be other cases," Sapin said.

Raids this month by police and justice investigators build on the work started by tax authorities three or four years ago, when they transferred tax data to judicial authorities that look into any possible criminal angle, Sapin said.

Google, McDonald's and other multinational firms such as Starbucks are under increasing pressure in Europe from public opinion and governments angry at the way businesses exploit their presence around the world to minimise the tax they pay.

Google says it is fully complying with French law and McDonald's declined to comment on the search, referring back to past comments that it is proud to be one of the biggest tax payers in France.

Sapin said he could not discuss what sums were at stake because of the confidentiality of tax matters.

A source in his ministry had said in February that French tax authorities were seeking some 1.6 billion euros ($A2.48 billion) in back taxes from Google.

Asked if tax authorities could strike a deal with the tech giant, he said: "We don't do deals like Britain, we apply the law."

Google agreed in January to pay STG130 million ($A264.09 million) in back taxes to Britain, prompting criticism from opposition MPs and campaigners that the sum was too low.

-Reuters