The other day I saw someone mention something about this idea but I don't remember what thread it was under and I can't come up with an effective search term to find anything. The basic idea is instead of paying extra on your mortgage you put the extra money into a taxable investment account, then use it to pay off your mortgage. Is there a name for this? Is this a wise thing to do? I like the idea of having the flexibility to use that money as a down payment on an investment property if that's what I want to do later.