Legal analysis: If you fail to repay the loan while in prison, you must pay a fine after the court decides. A fine is different from a fine. If it is mandatory, it must be handed in. After the court's decision, if the defendant does not take the initiative to pay the fine, the court should give it compulsory recovery.

Legal basis: Article 53 of the Criminal Law of People's Republic of China (PRC) shall pay the fine in one lump sum or in installments within the time limit specified in the judgment. If it is not paid at the expiration of the period, it will be compulsory. If the fine cannot be paid in full, the people's court shall recover it at any time if it finds that the person subjected to execution has executable property.