An ARM jumbo loan is an adjustable rate mortgage that exceeds the Fannie Mae and Freddie Mac loan-servicing limits. This amount, for most American counties, is $453,100. For more expensive areas, that limit can go as high as $679,650. Right now, ARM jumbo loans are becoming incredibly popular -- with statistics suggesting that around 75% of ARMs currently issued are actually for jumbo loans. Of that 75%, 47% of those home loans are for more than $1 million.
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