If you can automate it sure, but remember thats $80 a year before taxes because you'll be paying taxes on the interest. If you can't automate it and you have a 4k/month mortgage, the time/brain power to remember to do it monthly may be better spent doing something else that makes you money. At certain income levels, it is far more about maximizing income production than reducing expenses. At very low income levels, and at very high income levels this is typically most true. Low income levels no matter how much you cut, you just don't have enough to start with. High income levels, penny pinching isn't worth the mental fatigue and time spent when you could maximize income.