BUENOS AIRES (Reuters) - European finance leaders called for progress on global rules to tax the digital economy at a meeting of G20 finance ministers and central bankers in Argentina on Sunday, putting them at odds with U.S. counterparts.

European Commissioner for Economic and Financial Affairs Pierre Moscovici speaks during a news conference at the G20 Meeting of Finance Ministers in Buenos Aires, Argentina, July 22, 2018. REUTERS/Marcos Brindicci

The final communique reaffirmed a commitment to address the impacts of the shift to a digital economy on the international tax system by 2020, without giving more details.

The European Commission, the executive arm of the European Union, proposed rules earlier this year to make digital companies pay more tax, with U.S. tech giants such as Alphabet’s Google, Facebook and Amazon set to foot a large chunk of any bill. [nL8N1R32AX]

Some 200 companies would fall within the scope of the new tax, European officials said at the time, estimating additional annual revenues of about 5 billion euros ($6 billion).

Major digital companies had “to pay their fair share of tax, because basically what we are talking about here is fairness,” European Commissioner for Economic and Financial Affairs Pierre Moscovici told reporters at the G20 meeting.

He said he was calling for a turnover tax to be adopted before the end of the year as an interim solution.

However, some EU members have voiced concerns their companies could be affected by such a tax and international partners may respond with retaliatory measures.

“One of the big challenges is that taxation of the digital economy is mostly of course a taxation of American companies - because they are the key players in the world - so the United States feel that this is an attack concerning their digital economy, which it isn’t really,” European Council representative to the G20 Hubert Fuchs said on the sidelines of the meeting.

The U.S. delegation was not immediately available for comment. U.S. Treasury Secretary Steven Mnuchin said in a statement earlier this year that he “firmly opposes proposals by any country to single out digital companies,” noting that those companies were key contributors to the U.S economy.

‘POT OF GOLD’

Australia Treasurer Scott Morrison said the G20 discussions were useful because they established the root of the problem: that “no one knows” how to measure for tax purposes the value of the data users of social media services like Facebook create outside of the countries where those companies are based.

He said if those technical issues were not resolved, more countries would start taking “interim measures.”

“We’re not convinced at this point about the efficacy of those interim measures - which is basically a sales tax on digital advertising,” Morrison said. “It is more important to focus on those technical issues rather than the pot-of-gold approach, which is how much revenue can be raised.”

The European Commission wants a long-term, global solution based on a new method of calculating tax rates but has pushed in the meantime for the revenue tax to recoup revenues lost by EU states to large digital firms, officials said.

Implementing “fair taxation of digital giants” would also be a way of “proving that Europe is united and strong” at a time when the region’s leaders feel pressured by the administration of U.S. President Donald Trump, a senior European official said on the sidelines of the G20 meeting.

“We cannot accept that our SMEs (small and medium enterprises) have a level of taxation 40 points higher than the level of taxation of internet giants,” said the official, who requested anonymity to speak candidly about the talks.

The EU’s proposed levy on corporate turnover would be a major shift from existing rules, whereby companies are charged on their profits and pay no tax if they report losses.

“Taxation should be where the moneymaking is and if the digital economy is making the money all over the world it doesn’t really make sense if they only will declare their income in the United States,” said Fuchs, who is also Austria’s state secretary for finance.