If I make an overpayment on my mortgage payment, will it get applied to the principal or interest?

Any over payments are automatically applied to principal.. I don't even think it's possible to pre pay interest after your loan has started.. You could also apply it to your escrow account, but typically, if you do not specify where to apply it, it will go to principal. I'm a Broker here in Scottsdale AZ and I only lend in Arizona. If you or someone you know is looking for financing options, feel free to contact me or pass along my information. William J. Acres, Lender411's number ONE lender in Arizona. 480-287-5714 WilliamAcres.com NMLS# 226347

Any over payment would be applied to principal.

Anything above your required payment will be applied to principal reduction.