Perfect! Then, even though you don't have a formal promissory note, you can overcome this by the concepts of promissory estoppel, detrimental reliance, and unjust enrichment. This situation arises when Person A relied upon the verbal agreement, Person A performed based on such reliance, and because Person B defaulted, such reliance is now to Person A's detriment. Where there is i) partial performance by Person A based upon the mutual promises, ii) Person A relied upon such promises to perform, iii) Person B's failure to perform would be to Person A's detriment, and iv) result in Person B being unjustly enriched, Person A can overcome the legal requirement that the agreement be in writing. Your situation satisfies each of the foregoing elements and your sheet of paper confirms this was intended as a loan.
So, since he won't pay you voluntarily, file suit against him. This will give you the collection options and leverage you seek because once the suit is filed and a judgment awarded, you become a judgment creditor
, and if the losing party doesn’t then pay the judgment, you can have the sheriff serve a summons on the losing party for a debtor examination. That forces the losing party to meet the judgment creditor in court and answer questions under oath about the losing party's assets. After that information is obtained, the judgment creditor has the power to garnish wages, attach bank accounts, have the sheriff seize other personal property, and/or place liens on any non-homestead property to satisfy the judgment.
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