Dear hello, I'm glad to answer your question: How to open an electronic invoice? How many invoices remain are as follows: Here are two ways to inquire about the remaining quantity of invoices. Method 1 is relatively simple and direct. Click inventory query method 2 directly, click invoice collecting management in the menu bar, click inventory query, click invoice management and inventory query, and you can see how many remaining invoices are left. Measures for the Administration of Invoices of the People's Republic of China Article 27 Units and individuals that issue invoices shall establish a registration system for the use of invoices, set up an invoice register, and regularly report the use of invoices to the competent tax authorities. Article 28 Units and individuals that issue invoices shall, at the same time of changing or canceling tax registration, go through the procedures of changing and canceling invoices and invoice purchase books. Twenty-ninth units and individuals that issue invoices shall store and keep invoices in accordance with the provisions of the tax authorities, and shall not damage them without authorization. The invoice stub and invoice register that have been issued shall be kept for 5 years. After the expiration of the preservation period, it shall be destroyed after being inspected by the tax authorities.