Prepayment?

If you have 30 or 15 years fix mortgage, should you try to pay it off faster?

 According to this article, it pays to NOT prepay.

Why do so many people choose to put extra money into a mortgage when other options would likely increase their wealth? “This is really remnant of Depression mentality that has persisted from generation to generation,” says Amromin. At the time, most mortgages had one- to five-year terms, with a lump sum payment due at the end.