Anonymous wrote:The tax deduction you get on the interest paid is still less than the actual dollars paid in interest. Zero paid is better than x% of interest as a deduction.
This is a non-sequitur. Obviously the tax deduction doesn't cancel out the interest. But it affects whether paying down a mortgage or investing in the market is a better choice. Your market returns don't need to beat the interest rate on the loan, they need to beat the interest rate on the loan
minus the tax savings from paying that interest. That means a market return lower than the interest rate still pays off better than paying down the loan.