Daisuke “Dice-K” Enomoto, a former executive of Livedoor Co. who has been training to become the first Japanese space tourist, is suspected of failing to declare some 3 billion yen in income from stock deals, sources said Friday.

Of the 3 billion yen that was allegedly not declared in three years through 2004, the Tokyo Regional Taxation Bureau apparently believes the 35-year-old investor deliberately hid about 500 million yen and has imposed several hundred million yen in back taxes on him, the sources said.

Enomoto has already declared his income for the period and paid the back taxes, they said.

Enomoto plans to join the crew of the Soyuz TMA-9 spacecraft, which is scheduled to take off for the International Space Station in September.

If realized, he would be the world’s fourth space tourist.

The cost of his trip is $20 million (about 2.3 billion yen), and some of the profit from the stock deals is believed to have been used for the purpose.

As Enomoto’s information technology company merged with the Livedoor predecessor Livin’ on the Edge in fall 2002, he obtained about 2,100 shares of Livin’ on the Edge through an equity swap, the sources said.

He later sold most of the shares, which sharply rose in price, and used the profit to invest in a separate IT company, they said.

He earned some 3 billion yen through the deals through 2004 but did not make income declarations, they said.

The tax bureau determined the 500 million yen was income deliberately concealed, as he used a brokerage account under another person’s name, the sources said.

Enomoto become a director of Livin’ on the Edge upon the merger but quit the post in June 2003. The company changed its name to Edge in April 2003 and to Livedoor in February 2004.

The trial of Livedoor founder Takafumi Horie, charged with accounting fraud, is expected to begin at the Tokyo District Court in the fall.

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