Is it legal to add 3% penalty to the property on a daily basis?

Legal analysis: if the loss does not exceed 30%, the property penalty of 3% is legal. The liquidated damages are generally set at 20% of the amount of the subject matter of the main contract. When the actual loss is large, the liquidated damages may be appropriately increased, but the maximum amount shall not exceed 30% of the actual loss.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 578 Where a party expressly expresses or shows by his own behavior that he will not perform his contractual obligations, the other party may require him to bear the liability for breach of contract before the time limit for performance expires.

Article 585 The parties may agree that one party shall pay a certain amount of liquidated damages to the other party for breach of contract, or may agree on the calculation method of the amount of compensation for losses caused by breach of contract. If the agreed liquidated damages are lower than the losses caused, the people's court or arbitration institution may increase the liquidated damages at the request of the parties; If the agreed liquidated damages are excessively higher than the losses caused, the people's court or arbitration institution may appropriately reduce them at the request of the parties. If the parties concerned pay liquidated damages for delayed performance, the breaching party shall also perform the debt after paying the liquidated damages.