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The online marketplaces could be legally required to spot the tax evasion committed by many of their overseas sellers.
UK firms say they are being put out of business by the unfair competition.
Amazon and eBay said they make all users aware of their legal obligations.
“If the scale of the fraud is as big as the anecdotal evidence indicates, then we could be talking about billions of pounds,” said Rita de la Feria, a professor in tax law at Durham University.
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