"code": "TINFormatError",
	"target": "Unknown",
	"details": [
			"code": "TINFormatError",
			"number": 143,
			"message": "Taxpayer ID Number (TIN) is not in the correct format.",
			"description": "The TIN is a nine digit number. Acceptable formats: 123456789, 12-3456789, 123-456-789, and 123-45-6789.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/TINFormatError",
			"severity": "Error"

This error indicates that the U.S. Taxpayer Identification Number you provided is not in a recognized format. In the United States, a Taxpayer Identification Number is a nine digit number that is either an Employer Identification Number (in the case of a company) or a Social Security Number (in the case of an individual).

Recognized TIN/EIN/SSN numbers are in the format:

  • 12-3456789 (generally an Employer ID number)
  • 123-45-6789 or 123-456-789 (generally a Social Security Number)

You may also provide a number with no dashes if desired.

If you do not have an employer identification number, you may request one from the IRS online: https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-number-ein-online