So far this year, the tax authorities have found some 50 internet gamblers - believed to be Swedes - who have won large sums of money on gambling sites based outside the EU. Without knowing the exact identity of the gamblers, but pretty certain that they are Swedish, the tax authorities have turned to authorities in the former tax havens to get the last piece of the jigsaw.
"I am pretty certain that this is the first time that we have used the possibility of trying to get information about not yet identified people. And we have been getting excellent information from tax havens. This really has paid off," Dag Hardyson, internet specialist with the tax office, told Swedish Radio News.
He and his colleagues have been finding information about big poker wins on various websites where poker is being discussed. And although people use nicknames when playing poker on internet, the authorities in the former tax havens have been helping the Swedish tax authorities to identitfy several gamblers who have won big sums of money.
Since 2012, some SEK 250 million, that have been won by some 250 different Swedish online gamblers, will now have to be taxed for.
"We are talking about people who are well established in socuety, many of them are professional gamblers," said Hardyson.