How to get a US Tax Identification Number (TIN)
Register your business with the Internal Revenue Services (IRS)
It is important for businesses not only to have the incorporation number but also a Tax Identification Number (TIN). In the US, it is most often the Employer Identification Number (EIN).
The EIN is provided by the Internal Revenue Services (IRS) and is important when working with financial institutions, particularly when registering for online payment services.
Read about how to register for an EIN with the IRS.