Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

Setting up auto-pay. Should I use my bank that holds mortage or my personal bank?
Depending on your bank you may receive an ACH discount for doing automatic withdrawals from a deposit account at that bank. Now, this depends on your bank and you need to do independent research on that topic. As far as dictating what your extra money goes towards each month (early payments, principal payments, interest payments) you need to discuss that with your bank. I'm sure it's not too difficult to find. In my experience most banks, so long as you didn't sign a contract on your mortgage where you're penalized for sending additional money, will apply extra money toward early payments, and not principal. I would suggest calling them. I know for my student loans I have to send a detailed list of my loans and in what order I want my extra payments toward each, otherwise it will be considered an early payment, or it will be spread evenly among them all.