@NCperson wrote:
it is unlikely your strategy will work if you are serviced by any of the major servicers... you really can't 'pre-pay' interest. Your monthly payment is for the interest in the month just ended.
Well, interest is a tax deduction whenever it is actually paid, not when it is accrued. If you have a typical mortgage on autopay, you make a payment on January 2, which is the interest that accrued in December; an autopay on February 1 (depending on weekends) for interest accrued in January, and so on. So you make 12 interest payments and that shows on your 1098.
If that's how you normally pay, then paying the January bill at the end of December can get you one extra month of interest, assuming the servicer will credit it and add it to your 1098.
You probably can't get more than 1 month ahead. And you would only have 11 months in 2021, unless you pay ahead next year, and so on.
