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Expecting to move in five years; how to lock mortgage rates?
You can't transfer mortgages when you purchase a new property. You can purchase a new property now, or you can refinance your current property now and leverage yourself as far as possible while rates are low. The higher rates you are worried about may not be as bad as you think. With higher interest rates, that may put downward pressure on housing prices, or when rates do rise, it may simply move from historic lows to relative lows. I had a mortgage at 4.25% that I never bothered refinancing even though rates went much lower because the savings in interest paid (minus my tax deduction for mortgage interest) didn't amount to more than the cost of refinancing. If rates go back up to 5%, that will still be very affordable.