Since we're all getting along so nicely with our current "should we pay off the mortgage or invest" threads, I thought I'd stick my neck out there even further.
This is a post from a personal-finance blogger who I met at USAA last September. (Incidentally he has the best posts on the military TSP that I've ever read.) Ryan Guina looks at the math of getting a 15-year mortgage vs pre-paying a 30-year mortgage at the 15-year payment amount:
15 Year Mortgage Test - Can You Afford It?
This is a post from a personal-finance blogger who I met at USAA last September. (Incidentally he has the best posts on the military TSP that I've ever read.) Ryan Guina looks at the math of getting a 15-year mortgage vs pre-paying a 30-year mortgage at the 15-year payment amount:
15 Year Mortgage Test - Can You Afford It?
It's compelling to get a 30-year mortgage and have the flexibility to pay it off when you want to. It's also compelling to pay it off at the 15-year payment amount, knowing that your 30-year mortgage would become a 16-years-and-1-month mortgage. But that's just a slippery slope to deciding that you'd really rather not have to pay it off at all...Here are some recent national averages I found on fixed rate mortgages: 15yr @ 3.14%; 30yr @ 3.85%. Using a mortgage calculator at BankRate, I ran the numbers. Assuming all associated closing costs are identical and with the following mortgage assumptions:
...
Monthly principle and interest payments will be:
15-year: $1,394.67
30-year: $937.62
Payment difference: $457.05/mo.
Total Interest Paid:
15 year mortgage: $51,040.53
30 year mortgage: $137,541.93
A 15 year mortgage would save you $86,501.40 over the life of the loan. That isn’t chump change, and is likely to convince many people to go with the 15 year mortgage “if they can afford it.” But we’re not done playing with numbers yet.
Let’s assume you choose the 30 year mortgage, but make the same monthly payment you would have with a 15 year mortgage. Using the same loan assumptions as above, you would pay $68,356.31 in interest on a 30 year mortgage when making the same size payment as the 15 year mortgage (the spread on the interest rates between the 15 and 30 year loans accounts for the difference).
Verdict: Prepaying a 30 year mortgage at this schedule would take an additional 13 months of payments, and $17,315.78 in interest payments vs. the 15 year mortgage. Suddenly the gap isn’t so large. Granted, $17k is a lot of money, but so is the value of flexibility.
Back to the Importance of Cash Flow…