The term 'Tax ID Number' is a broad one, covering various tax-related identification numbers across different bodies and countries. When you're trying to figure out what a tax ID number looks like or what format it should be, you're firstly looking at its core purpose: to identify you or your business for tax purposes.

Now, let's dive into the various types and formats of Tax IDs to understand what they look like.

Taxpayer Identification Number (TIN)
A TIN is a universal term referring to any unique number assigned to an individual or entity for tax purposes. The format varies by country and organization, but usually it's a combination of numeric and sometimes alphabetic characters.

The length and composition of a TIN depend on the issuing authority, ranging from a simple Social Security Number (SSN) which is a 9-digit number in the U.S. to lengthy European VAT identification numbers.
Social Security Number (SSN)

A Social Security Number (SSN) is a 9-digit number used primarily for taxation purposes in the United States. The format is as follows: XXX-XX-XXXX, where X is a digit. This is a unique identifier assigned to each U.S. citizen and resident alien.
Here's an example: 123-45-6789
Employer Identification Number (EIN)

Similar to SSNs, Employer Identification Numbers (EINs) are used by employers, sole proprietors, and other business entities in the U.S. for tax purposes. The format is consistent with SSNs, marking them as distinctive. An EIN usually looks like this: XX-XXXXXXX.
For example: 12-3456789
Value Added Tax (VAT) ID

Value Added Tax (VAT) ID numbers are used in many countries to identify businesses for tax purposes. These numbers can contain both letters and numbers, and the format varies by country. In the EU, VAT IDs are composed of a 2-digit country code, followed by a 10-digit national identification number.
Here's an example of a UK VAT ID: GB123456789









VAT ID in the EU
EU VAT IDs follow a specific format to represent the country and the main business identifier. The country code uses two digits, and the main business identifier varies:
- Belgium: 12345678901
- France: FR123456789
Non-EU VAT IDs
There's no globally standardized VAT ID format for non-EU countries. For some, like Switzerland, it's in the format CH 123.456.789:01-2345678-9, while in Norway, the VAT number is simply 123.456.789.
For instance, a Swiss VAT ID could look like: CH 212.123.456.789:01-2345678-9
Understanding the format of your tax ID number helps in correctly filing your taxes and avoiding errors. Always check what your specific tax ID should look like based on your location and the relevant tax authorities. This knowledge also helps in maintaining accurate records and protecting against fraudulent activities.