@Victor S.
Sorry man, i didnt read your comment correctly the first time. You said:
"This "velocity" method works, but it's not any better than simply applying additional pmts to your principal."
This in itself proves that the method does not work!
If it does the same thing as simply paying extra, what the hell is the point of introducing a LOC into the mix and complicating the crap out of your damn life?
The whole idea of "Velocity banking" is to pay same amount in extra payments as you normally would, but instead of paying directly to the MTG, you channel through HELOC, and by doing that, you supposedly pay the loan down quicker than you would without the HELOC. (This doesnt work by the way)
I just barely opened the spreadsheet you linked, and assuming its coded properly - it shows that LOC method actually SAVES YOU LESS ($77,857 vs $77.813)
So, i go back to my original statement:
I still have not seen any math that proves me wrong. I got excited when i saw the spreadsheet because i though i have something to dismantle, but it just proves me right.....