“The U.S. Internal Revenue Service should give taxpayers clear rules on how it will handle transactions involving Bitcoin and other digital currencies, Nina Olson, the National Taxpayer Advocate, said today. Spending Bitcoins to purchase goods may trigger capital gains and losses or ordinary income and losses, which have different tax rates, Olson said in her annual report to Congress. ‘It is the government’s responsibility to inform the public about the rules they are required to follow,’ she wrote. ‘The lack of clear answers to basic questions such as when and how taxpayers should report gains and losses on digital currency transactions probably encourages tax avoidance.'”
http://www.bloomberg.com/news/2014-01-09/clear-bitcoin-tax-rules-needed-taxpayer-advocate-says.html