To get a payoff letter, ask your lender for an official payoff statement. Call or write to customer service or make the request online. While logged into your account, look for options to request or calculate a payoff amount, and provide details such as your desired payoff date.
In the United States, the Internal Revenue Service governs the taxation aspects of promissory notes. Specifically, the interest income received from a promissory note is taxable and should be reported, whereas the principal amount usually does not have tax implications unless the note is forgiven or canceled.
Promissory notes are quite simple and can be prepared by anyone. They do not need to be prepared by a lawyer or be notarized. It isn't even particularly significant whether a promissory note is handwritten or typed and printed.