1. You can query the company's bank tax payment voucher, and the taxpayer identification number is in the upper left corner of the tax payment voucher.

2. The special VAT invoice issued by the company has the taxpayer identification number, two taxpayer identification numbers, the taxpayer identification number of the purchasing unit and the taxpayer identification number of the selling unit.

3. Check the company's national tax registration certificate. The number 15 in the upper right corner of the homepage is the taxpayer identification number. The company's local tax registration certificate also has the word tax, and the taxpayer identification number on a company's national tax and local tax is the same.

4. The taxpayer identification number can also be viewed on the home page of the invoice receiving book;

You can check with the company's tax staff. What is the taxpayer identification number?

The tax identification number is the same as the social credit code, and the relevant provisions are as follows:

1, taxpayer identification number, usually referred to as "tax number". The taxpayer identification number is the number on the tax registration certificate, and the taxpayer identification number of each enterprise is unique;

2. Every citizen may have a unique and lifelong digital code identification compiled by the tax department to confirm his identity;

3. Before the integration of the three certificates, the unified social credit code is the industrial and commercial business license code, and the taxpayer identification number is the tax number provided when going to the tax bureau for business. After the integration of the three certificates, the taxpayer identification number is the same as the unified social credit code.

To sum up, the parties can inquire about the taxpayer identification number in the following ways: Under normal circumstances, the parties can go to the tax authorities, the industrial and commercial administrative authorities or the websites where enterprises publicize information. If an enterprise pays taxes according to regulations, banks and financial institutions will log in the tax registration certificate number, and the tax authorities can inquire according to law.

Legal basis:

Article 17 of the Law of People's Republic of China (PRC) on Tax Collection and Administration shall, in accordance with the relevant provisions of the state, open basic account and other deposit accounts in banks or other financial institutions with tax registration certificates, and declare all account numbers to the tax authorities. Banks and other financial institutions shall register the tax registration certificate number on the account of taxpayers engaged in production and operation, and register the account number of taxpayers engaged in production and operation on the tax registration certificate. When the tax authorities inquire about the account opening of taxpayers engaged in production and business operations according to law, the relevant banks and other financial institutions shall provide assistance.