For the last year, I have been adding a little bit of extra to my house payments. I have a 15 year fixed rate mortgage that I obtained at 4.875% a few years ago.
When I carefully looked at my statement from the loan servicer, I realized that the next "due date" is June 1.
So, it appears, that the way mortgage lender treats my extra payments is to just permit me to pay next payment later.
Based on a gut feeling and without deep analysis, it would seem that it permits the bank to collect full 4.875 interest on my entire balance, and hold my extra money for free.
So, my thinking goes, I would benefit from asking the bank to instead apply this surplus to my principal. The downside is that after doing so, I would no longer be able to defer my payments in case of, say, job loss.
I called the bank about it yesterday, and the employee told me that yes, I have an option of applying this surplus find to the principal.