Too late to benefit from a home refinance?

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Don Taylor

Don Taylor

Dear Dr. Don,
I bought a house for $420,000, paying $40,000 down at a 4.25 percent rate of interest. The goal was to flip the house. I have ended up living there for the past seven years with a monthly mortgage payment of $3,500. If I were to refinance, would I lose the potential principal backside coming in the next seven years? In other words, after a refi, would I lose the approximate $300,000 that I've already paid mainly toward interest?

Thank you,
-- R.M. Mortgage

Dear R.M.,
I had never heard of the term "principal backside" before, so your letter intrigued me. I'll assume you're not talking about an educator, but I didn't find the term in any of the real estate dictionaries or glossaries I looked at.

The money spent on interest went to the lender. The principal component of your monthly payment whittled down your loan balance, helping to build an equity stake in your home. How much equity depends on the accrued appraised value of your property over the seven years as you've owned it.

Let's say you're seven years into a 30-year mortgage, and you refinance with another 30-year mortgage. Then, you are extending the loan term by seven years and paying additional interest on the money borrowed. The amount of money borrowed to refinance the home is reduced to the existing mortgage balance.

When you refinance, the lender considers the loan-to-value, or LTV, along with your income and credit history to determine risk lending to you. For a conventional financing, the lender doesn't want to lend more than 80 percent loan-to-value. Higher LTVs require you to take out a private mortgage insurance policy to protect the lender against the risk of you defaulting on the loan. The difference between the appraised value and the loan amount is the best estimate of your equity in the home.

Unfortunately, it appears that you might be late to the refi party. Mortgage interest rates have gone up by almost a full percentage point since spring. Bankrate's national average for a 30-year fixed-rate mortgage is, as of this writing, 4.47 percent. You'd have to look into refinancing with a shorter-loan term to capture a lower interest rate since there's no interest savings in refinancing if you pay a higher rate.

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