It said that the Russian tax ministry has asked for an additional 34bn roubles (£618m) from Yukos’ main production unit Yuganskneftegas to cover the 2003 tax year.
The news comes only days before bailiffs auction Yugansk on 19 December to help pay for Yukos’ overall $26bn (£13.4bn) tax bill.
The extra tax demand sent Yukos’ shares tumbling 10% in trading in Moscow.
Russian tax authorities are already seeking $3.8bn in unpaid taxes from Yugansk for 2001 and 2002.
Does Darwin's theory apply to taxation? Colin ponders...
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