<prompt> Human: Im thinking of taking a 20K loan from my 401K to pay down my mortgage. The interest rates are comparable and the 401K loan does not have any maintenance fees.I think its a good idea since Ill be paying the interest to myself rather than the bank. But, am I wrong?  <response>: Paying down the mortgage isnt going to lower your monthy payment, plus youll then have to come up with the money to pay the loan back. If you already can afford to pay the loan back, then why not just pay that amount extra on the mortgage every month and avoid the loan? 