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Adjustable-Rate Mortgages Starting To Adjust Higher

ARM adjustments creeping higher

For the first time in a year, homeowners with adjusting mortgages are facing rising mortgage rates. The interest rate by which many adjustable-rate mortgages adjust has climbed to its highest level since September 2010, and looks poised to reach higher.

This is because of the formula by which adjustable-rate mortgage adjust.

Each year, when due for a reset, an adjustable-rate mortgage’s rate changes to the sum of fixed number known as a “margin”, and a variable figure known as an “index”. For conforming mortgages, the margin is typically set to 2.250 percent; the index is often equal to the 12-month LIBOR.

LIBOR stands for the London Interbank Offered Rate. It’s a rate at which banks lend to each other overnight.

Expressed as a math formula, the adjusting ARM formula reads : (more…)