Core Viewpoint - The article provides a step-by-step guide for companies on how to handle the cancellation of unused invoices during the deregistration process, emphasizing the different procedures for electronic and non-electronic invoices [1]. Group 1: Invoice Types and Procedures - If the remaining invoices are electronic invoices, there is no need for cancellation [1]. - For non-electronic invoices, such as ordinary paper invoices or electronic paper invoices, companies must go through the electronic tax bureau to cancel them [1]. Group 2: Step-by-Step Cancellation Process - Step 1: Log into the electronic tax bureau and navigate to the "Invoice Cancellation" menu [2]. - Step 2: The system will display the types of invoices eligible for cancellation along with their starting number ranges [3]. - Step 3: For non-electronic invoices, they must be processed by cutting corners before uploading a photo as proof; electronic invoices do not require this step [4]. - Step 4: Select the invoices to be canceled, specify the cancellation type, and provide a reason before submitting [7]. - Step 5: After confirming the data, if the invoices are non-electronic, they will require review by the tax authority; electronic invoices will be processed automatically [8][9].