The $10 billion tab for the administration's proposed plan to provide Federal Housing Administration refinances for up to 4 million borrowers whose existing loans are not owned or guaranteed by Fannie Mae or Freddie Mac would be charged to mortgage lenders.

But such a proposal is unlikely to make it through Congress.

Also, it is unclear whether the plan would target negative-equity borrowers as is the case with the enhanced version of the Home Affordable Refinance Program.

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