Depends on the conditions stated in the mortgage. Most prohibit repayment within a period of time that is identical to any teaser rate.
Forgive my naivity about the US but as I understood it teaser rates and subsequent re-sets were a big part of the recent problem over there? i.e. a lot of people were not taking out mortgages at a rate that would apply for the life of the mortgage. Also that in many states people are able to walk away from their mortgage without penalty (jingle mail I believe it's called?).
Seems to me there are big problems on both sides of the pond.
UM
Dear Ursa,
No question there are problems here as well; but the naivete is not yours, but of those who sign mortgage agreements without reading the terms carefully. The re-set, or 'balloon' mortgages, do have an attractive initial rate, but after a set period revert to the prevailing rate. Why someone would agree to this knowingly (other than an incorruptible optimist) is beyond me. Many have lost their homes when the rate ballooned. (Others lost their homes when they lost their jobs or health coverage, which is another story.) It is much safer to take a fixed rate mortgage, which remains fixed for the life of the loan, often 30 years; if these rates are not manageable, one should not be buying property.
Not sure of your reference, "able to walk away from their mortgage without penalty". What do, you mean, 'walk away'? Pay it off, or abandon the home? I have never heard the term 'jingle mail' but will look it up.
JLH