Printed IOUs, if they have the debtor's autograph or handprint, have high probative effect, and the court will generally accept them. But whether it is effective or not depends on whether the actual creditor-debtor relationship exists, not just in form.

legal ground

Article 668 of the Civil Code stipulates that a loan contract shall be in written form, unless otherwise agreed between natural persons.

The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.