How quickly can you pay off a fresh mortgage if you have the cash?

I am currently in the process of buying a property. I currently have the cash to close but the sellers do not know. I decided to get a mortgage so that I can include an appraisal contingency to make sure that I am buying the house at the fair market value. If I decide to go through with the mortgage, and already... show more I am currently in the process of buying a property. I currently have the cash to close but the sellers do not know. I decided to get a mortgage so that I can include an appraisal contingency to make sure that I am buying the house at the fair market value. If I decide to go through with the mortgage, and already have the cash to pay it all off as soon as I close, can I pay off the whole mortgage at the day of closing?
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