The Treasury Department dramatically boosted its estimate of losses from its $85 billion auto industry bailout by more than $9 billion in the face of General Motors Co.'s steep stock decline.

In its monthly report to Congress, the Treasury Department now says it expects to lose $23.6 billion, up from its previous estimate of $14.33 billion.

The Treasury now pegs the cost of the bailout of GM, Chrysler Group LLC and the auto finance companies at $79.6 billion. It no longer includes $5 billion it set aside to guarantee payments to auto suppliers in 2009.

The big increase is a reflection of the sharp decline in the value of GM's share price.