Answers about Mortgage Payments and Late Payments

My monthly mortgage payment is $500 (principal and interest). I sent a payment of $1,000 with the intent of applying the surplus to the principal, but the bank applied the entire surplus to the interest. Can it do this?

Generally, national banks will allow you to pay additional funds towards the principal balance of your loan. However, you should review your loan agreement or contact your bank to find out their specific process for doing so.