An official said Mr Kasyanov's Russian People's Democratic Union had not properly completed the documents.
BBC: Mr Kasyanov is one of Vladimir Putin's rare public critics
Mikhail Kasyanov, a former prime minister turned would-be opposition leader, predicts a national crisis following a manipulated election.
Mr Kasyanov, premier between 2000 and 2004, has become one of the rare public critics of President Vladimir Putin.
BBC: Mr Kasyanov is one of Vladimir Putin's rare public critics
Mikhail Kasyanov, the outgoing prime minister, has long been tipped for the sack.
This knowledge greatly strengthens the hand of wily Mr Kasyanov, who has built his career on helping Russia dodge its debts.
Subsidiary boss Igor Kasyanov could face a six-year jail term if convicted.
Mr Putin's place will be taken by Russia's prime minister, Mikhail Kasyanov.
Kasyanov called for more street demonstrations to increase pressure on Putin, but said the opposition was not trying to mimic the Arab Spring.
Recently, though, Mr Kasyanov had shown signs of toeing the line and some gave him an even chance of staying in the job.
Mr Kasyanov heads Rusal Folga (Rusal Foil), and is accused of doctoring accounts from 2008 to 2009 to include services rendered by a non-existent company.
Three prominent Russian politicians -- current energy czar Anatoly Chubais, Finance Minister Mikhail Kasyanov and New Force leader Sergei Kirienko -- discussed their country's future.
In contrast with older, less popular opposition figures like Boris Nemtsov or Mikhail Kasyanov who served in government, he brings no baggage from that time.
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The early dissolution of the government, and the naming of Viktor Khristenko, a deputy prime minister, as his temporary stand-in may mean that Mr Kasyanov is indeed out.
Optimists should be suspicious, too, if Mr Putin appoints Mikhail Kasyanov, the current finance minister, to the prime ministership: he is too close to at least one oligarch.
What Mr Kasyanov did not say was that Russia's harsh winter means that daily production always falls by around that much in the early months of the year (see chart).
Mr Kasyanov is the only Russian politician to have declared his intention to run for president when Mr Putin steps down after he completes his second term in office in 2008.
BBC: Mr Kasyanov is one of Vladimir Putin's rare public critics
Russian authorities rejected the candidacy of Mikhail Kasyanov, a former prime minister, for Russia's presidential election on March 2nd, because, they said, 13% of the 2m signatures supporting his campaign were invalid.
Last month the Russian justice ministry announced that it was refusing to register the People's Freedom Party, a coalition created by four former members of previous Russian governments: Mikhail Kasyanov, Boris Nemtsov, Vladimir Ryzhkov and Vladimir Milov.
Mr Putin is supposedly obliged to stand down in 2008 but he is quite likely to seek some more or less legitimate reason to stay in power after then Mr Kasyanov would face an enormous challenge in trying to unseat him.
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The same story is broadly true in the government, though Mr Berezovsky himself denies the close ties widely assumed to link him to such top figures as Mikhail Kasyanov, now tipped to be promoted from finance minister to prime minister.
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