Also i'm really annoying myself. As part of my budget planner, and since i'm on a tracker rate mortgage. I worked out a mortgage payment schedule, to help me forecast payments etc depending on rate movements.
Everything was working swimmingly, until i've tried to build in an overpayment calculator. The problem is that by sticking in an overpayment, it's reducing the following payments which i don't want to do, but i do want to keep the option to flex the future interest rate.
I feel like i keep staring at it and making 1 step forward but 2 steps back!
I'm aiming at selling up around December 23, so the normal online calculators don't really offer much help as they work on the life of the mortgage, whereas i'm wanting to look short term to compare against short term investing.