Let's say you house note is $1000/month and you are paying 5% interest. That is about $50/month or $600/year in interest. This is the average amount over the life of your mortgage. Considering the rule of 78 which loads your interest payments into the first part of your mortgage, the amount of interest diminishes yearly. With only 4 years left on your note you have passed the half-way point and are now paying more principal than interest. Over the next 4 years you will be paying $48,000 of which about $2,400 is interest. If you are in the 20% tax bracket you only will get about $120/year effective write off. Once you pay it off, you KEEP $1000 / month and are not giving anyone the interest. I realize the numbers seem like "no big deal" but why would pay $600 so you can save $120? Paying off your mortgage early ALWAYS puts more money in your pocket.
I over simplified the numbers and rounded in a couple of places, but the fact remains that the sooner you pay off your mortgage, the sooner you keep all of your money.
Is there an online tool or something I can use to calculate this? I can't argue that paying off a mortgage early always puts more money in my pocket, but isn't a key factor in whether I come out ahead what rate of return I could earn on that money? Given the bull market in the past few years, I'm kind of glad I didn't tie up my money by making additional principal payments on my home loan and instead put it into my investment account.