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One of the fairy tales borrowers frequently hear is that a loan carrying an interest-only (IO) option is priced better than the same loan without the option. It is a fairy tale because the IO allows the borrower to avoid paying down the loan balance, which makes it riskier to the investor -- and greater risk should mean a higher price.
At the wholesale level, where prices are extremely competitive because they are directed to mortgage brokers, the IO version of a loan always carries a higher price than the same loan without the IO option. Sometimes the price difference is small, sometimes it is large -- but I have never seen IOs priced lower.
Anything Can HappenYet in the bazaar-segment of the retail market, where borrowers deal one-on-one with mortgage brokers and loans officers (collectively "loan providers"), anything can happen. A trusting borrower without knowledge of competitive prices, dealing with a sales-hungry loan provider, could be told that the IO was priced better. The purpose of the fairy tale would be to move the deal forward. Here is an example:
"I read your postings on interest-only loans, but it didn't seem to apply to my situation. My broker gave me the option of a 30-year fixed-rate mortgage at 6.125 percent, or an interest-only (first 10 years) with a fixed 30 year rate of 5.875 percent. My plan was to take the interest-only but make the larger payment that I would have had on the amortizing loan. This should save me money..."
I don't have any facts other than those in the letter above, and can only speculate about the source of the misinformation. Perhaps the most plausible explanation is that the 6.125 percent rate was simply concocted out of thin air to make the 5.875 percent rate on the IO look good. A borrower who gets all his information from a loan provider is vulnerable to such chicanery.
A second possibility is that the IO is on an adjustable-rate mortgage (ARM), rather than a fixed-rate mortgage (FRM), as the borrower was led to believe. ARMs typically are priced lower.
Leaving Out Other ChargesA third possibility is that both rates are correct but the loan provider left out other loan charges, including points. As an illustration, I went to an online site and priced a 6.125 percent 30-year FRM against a 5.875 percent IO version of the same loan. Both loans were there, but the second cost 2.3 points more than the first.
A final possibility is that the loan provider was "low-balling" the IO rate and had no capacity to deliver the 5.875 percent quote. The market changes every day, and loan providers can't be held to quotes until they are locked. Between the quote day and the lock day, they can choose from a wide selection of explanations as to why the rate is higher, including a general change in the market and a reevaluation of the borrower's credit.
The upshot is that borrowers cannot be confident that loan providers are giving them reliable information about price differences between different loan options. Many loan providers will, but some will exploit the borrower's ignorance for their own benefit.

















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