If the IOU is torn off and stuck, it still has legal effect if the content is clear, but if it is unrecognizable, the legal effect will be weakened. Therefore, both parties can reach an agreement through negotiation, re-establish the IOU or make corresponding changes.

legal ground

Article 143 of the Civil Code

A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.

Article 543

If the parties reach an agreement through consultation, the contract may be changed.

Article 544

If the parties are not clear about the contents of the contract change, it is presumed that it has not been changed.

Article 667

A loan contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668

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.