Are my calculations correct?

If I understand your data correctly, your note rate is 3.75%. The original balance was $120,000, your current payment is $827, and your current balance is $90,273. You did not provide the original number of payments (ie: A 30-year loan) or if your current payment of $827 is just principal and interest or if it also includes impounds for taxes and insurance. However, adding an additional $827 as a principal payment each month is likely to pay the loan off in less than 10 years. Essentially, with no other amounts being applied, and just $827 per month to cover P & I, the loan would be paid off in 134 months based on the above data you provided. Since you are already paying $827 per month (my assumption is that only $555.74 is going toward P&I and the balance to Impounds for Taxes & Insurance), If correct, the additional $827 per month going to principal in addition to your current payment, you should pay the balance to zero in 73 months, or about 6 years and 1 or 2 months Finally, if ALL of your current payment of $827 is being applied to P&I, then adding another $827 to your monthly payment would bring your balance to zero in about 60 months or 5 years. Hope this helps~ Bert Carpenter, The LoansA2z Team of NEXA Mortgage ~ NMLS 40586 ~ Certified Mortgage Advisor and Certified by The National Association of Mortgage Professionals as a Certified Veterans Lending Specialist.NEXA is licensed in all states except MA and NY so give us a call. ~ www.LoansA2z.com 480-889-9000 - OR - 480-695-9300.