Hello! The successful cancellation method is: 1. If the declaration is successful but the tax is not paid, you can contact the competent tax authorities to void or cancel this declaration and make a new online declaration. If the payment has been declared successfully, you can only apply for a refund, and then the declaration form will be invalidated; 2. The online declaration interface has the option to cancel the declaration. Click and select the declaration form to cancel, which can be modified and then formally declared. 3. Go to the lobby of the competent tax authorities, ask the professionals to log off from the intranet, and then declare again.