I was included in a FaceBook thread where a homeowner considered whether to refinance his 30year Fixed rate mortgage into a 15 year fixed rate mortgage, or to find an online calculator that would assist him in creating a prepayment plan.
Here’s his query:
Can anyone recommend a decent mortgage calculator site/app/spreadsheet?
We’re currently on a 30 year/4% fixed. Trying to compare two options:
1) Switch to a 15 year/3.65%.
2) Start paying an additional quarterly payment against principal with the existing mortgage.
I know this isn’t exactly advanced math, but I also feel like someone must have put something together that shows the impact of added payments against principal. Mortgage calculators are great at helping figure out the cost of new mortgages (i.e., option #1 above), but not so good at helping jigger existing mortgages (option #2).
Here’s my response:
First check with your tax professional before you consider a day in the near future when you “burn the mortgage!” While it may feel great to someday own your home free of any debt, you might lose out on a valuable (in real dollars) tax deduction. Second, rather than refinance and incur closing costs again, prepaying a 30 year mortgage is easy-peasy! Simply add 4% of your current Principal and Interest monthly for year one of your prepayment plan. In subsequent years, add ANOTHER 4% of each years’ NEW monthly payment. Treat your mortgage like an employee with “4% cost of living raises” each year. If you follow this course you can prepay a 30 year loan in 13 years. Hope that helps!
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