The mortgage payoff calculator helps you find out. You must sign and date the form on or after the last day of the quarter.By completing and submitting the PSLF form, your number of qualifying payments will be updated to correspond with your dates of employment. Taking out a 401(k) loan isn't an ideal situation, but if you're forced to do so, can you pay it off early? Mortgage Payoff Calculator: See how changes in your payment can affect your payoff time. Estimate how much you can save, and how much equity you can create. You don't need an attorney to write a Washington promissory letter. Simply download the relevant form and fill out the required information. Additional principal payment. Your proposed extra payment amount per month.