The proposed $9 billion public buyout of the Long Island Lighting Co. could cost billions of dollars more than expected as New York State figures in the cost of the utility's unpaid taxes, state legislative staffers and market analysts said yesterday.

Lilco's deferred tax liabilities total $2.93 billion as of Dec. 31, 1993. At the moment, staffers working in the state legislature say they believe that Lilco has a total of $1.9 billion in deferred federal taxes that the state may be forced to pay in the event of a buyout, making the state's total buyout cost around $11 billion.

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