Call the tax bureau to ask. The following effective inquiry methods are recommended for the authenticity of invoices: Ensure validity and remember to use rewards.

1. Inquire about the invoice inquiry system of the website of Chengdu Local Taxation Bureau;

2. There is a national invoice inquiry tool online, which is connected with the data of local tax bureaus, such as friendly invoice inquiry.

3. Call local 12366 for enquiry;

4. Identify and confirm the invoice management department of the tax authority that printed the invoice.