San Francisco Chronicle

Cryptocurr­ency trading has given rise to plenty of questions, but there are no easy answers for taxpayers or their advisers.

- By David Voreacos David Voreacos is a Bloomberg writer. Email: dvoreacos@ bloomberg.net

The IRS, fresh off its success in uncovering U.S. assets hidden in Swiss banks, has assigned elite criminal agents to investigat­e whether bitcoin and other cryptocurr­encies are being used to cheat the taxman.

A new team of 10 investigat­ors is focusing on internatio­nal crimes. In addition to following undeclared assets that are flowing out of Swiss banks after a crackdown, it will also build cases against tax evaders who use cryptocurr­ency. The promise of anonymity that has drawn money launderers and drug dealers to virtual coins is also attracting tax cheats, the IRS has said.

The agency hasn’t charged anyone yet, but the cases will come, Don Fort, chief of the IRS Criminal Investigat­ion Division, said in an interview.

“It’s possible to use bitcoin and other cryptocurr­encies in the same fashion as foreign bank accounts to facilitate tax evasion,” Fort said.

Regulators around the world are rushing to tighten rules in response to the frenzy over digital coins. A booming market

for the coins made some investors millionair­es virtually overnight before bitcoin fell 44 percent this year.

The Securities and Exchange Commission formed a group to combat potential fraud, which has cracked down on companies that sell digital tokens illicitly and warned investors they might get fleeced.

“The biggest challenge for the IRS is this really new technology,” said Lisa Zarlenga, a tax attorney at Steptoe & Johnson LLP. “They need to educate themselves on what is a blockchain, how do we learn what’s on the blockchain, and how do we follow it?”

Blockchain­s are online ledgers that record transactio­ns in virtual currencies. They can be public or private. Because there’s no central authority in the blockchain, people can often store wealth secretly and serve

as their own bankers.

IRS criminal agents, who can arrest people and help send them to prison, have benefited from the work of the agency’s revenue agents. They formed a team in 2013 to study the use of virtual currencies to avoid taxes by moving money in and out of offshore accounts.

That team spent two years helping to prepare a legal summons seeking the identities of all customers of San Francisco’s Coinbase, one of the largest virtual currency exchanges, from 2013 to 2015. After a legal fight, the IRS narrowed its request but still argued it had a “reasonable basis” to believe many Bitcoin users weren’t paying taxes. They likened Bitcoin exchanges to the “Wild West” days of unregulate­d barter exchanges in the late 1970s and early 1980s.

“Billions of dollars in bitcoins are currently being transferre­d by malware ransomers, online drug dealers, tax evaders and other criminals, all of whom are emboldened by what they perceive to be law enforcemen­t’s inability to pierce bitcoin’s pseudo-anonymity,” Justice Department Tax Division attorneys argued in a Sept. 1 court filing.

Fort said his unit focuses on how users convert cash to cryptocurr­ency and back. “We know that you want to get your money out at some point,” he said.

In addition to individual­s who evade taxes, Fort’s agents are looking at unlicensed exchanges in the U.S. and overseas. They are working with other criminal agents around the U.S. and stationed abroad.

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