The company has been roiled by a profit-padding scandal, in which high-handed bosses for years systematically pushed their subordinates to cover-up weak financial figures.
Toshiba, a pillar of Japan's industrial establishment, is expecting a huge loss of about 710 billion yen (USD 6.4 billion) for the year to March with sagging global demand also contributing to its financial woes.
"Several of our US subsidiaries have been requested to provide information by the US Department of Justice and Securities and Exchange Commission, and they are cooperating with the request," Toshiba said in a statement, referring to what it described as an "accounting problem" though it refrained from naming any of the companies.
The loss could be up to 200 billion yen (USD 1.8 billion), the Asahi Shimbun daily said.
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Toshiba will hold a news conference later today after the market close to announce its mid-term business plan.
In the wake of the scandal, Toshiba - a vast conglomerate that makes everything from rice cookers to nuclear plants - has ushered in thousands of job cuts and plans to sell various business units in a bid to revive itself.
Toshiba said yesterday that it has sold its medical devices unit to camera and office equipment maker Canon for almost USD 6 billion.
It also announced a basic agreement to sell a majority interest in its home appliance business to China's Midea, though a Toshiba spokeswoman said a price for the deal had yet to be announced.