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Is an interest-only mortgage a bad idea?
Normally interest only mortgages are taken incase one planning to sell off the property after a few years and purchase of the property is for investment. In such a case instead of burdening oneself with a huge EMI, one opts for an interest only mortgage, and towards the end of the term, sell off the house at profit and repay back the entire principal.  I am not to sure if interest only mortgages are encouraged for properties you plan to live in. Although I do not know about the ING scheme, normally there is no prepayment option on interest only mortgages, its Bank way of earning a fixed income for the contracted period and thats the reason why the interest rates are lower than a regular mortgage. If you do the math, you may be paying more in total interest than on a regular mortgage.