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How the System Handles Tax Identifiers

The system uses a single field — TIN (Taxpayer Identification Number) — for all tax identifiers. There is no separate VAT field. What gets validated is determined automatically based on the company’s country:
Company countryValidation performed
United StatesEIN verification
EU member state (27 countries)VAT validation
All other countriesNo tax ID validation
When building a KYB workflow, configure the TIN field only — the system handles VAT vs. EIN routing automatically.

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EU Countries (VAT Validation)

VAT validation applies to the 27 EU member states: AT BE BG HR CY CZ DK EE FI FR DE GR HU IE IT LV LT LU MT NL PL PT RO SK SI ES SE Notable exclusions — no VAT validation runs for these:
  • EEA non-EU countries: Norway, Iceland, Liechtenstein
  • Non-EU Balkans: Serbia, Albania, North Macedonia, Bosnia, Montenegro, Kosovo
EU Balkan members are included: Bulgaria (BG), Croatia (HR), Romania (RO), and Slovenia (SI) all receive VAT validation.

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Troubleshooting: VAT Validation Unexpectedly Skipping

If VAT validation is not running for an EU company, check:
  1. Is the country field set correctly to one of the 27 EU member state codes?
  2. Is the TIN field populated and at least 2 characters long?

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Using a Company’s EIN (Tax ID)

EIN verification is only available for businesses registered in the United States. If a non-US company is submitted, the system will return: “EIN verification is available for US companies only.”

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Add an EIN to Your KYB Workflow

When creating a custom KYB workflow, you can request an EIN in various sections:
  • Company Information
  • Sole Proprietorship Details
  • Ownership Structure
Once configured, this field will be mandatory for U.S. companies. After setup, you can create a verification session:
  • Via the dashboard
  • Through an API call

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Verify TIN with iDenfy KYB

Direct Input by the Client - During the KYB verification process, clients can add their EIN directly in the highlighted field. Manual Input by You - If a company provides additional information separately, you can manually upload their EIN (with consent).
  1. Edit TIN for Individuals in the Ownership Structure
  2. Edit TIN for individuals
  3. Select the individual for whom to add TIN
LimitationEIN / TIN does not work as a standalone feature, and can not be used outside the KYB verification
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Understanding TIN and EIN

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What Is a TIN?

A Tax Identification Number (TIN) is a unique number used by tax authorities to identify individuals and entities for tax purposes. In the United States, there are different types of TINs based on who is paying taxes:
  • SSN (Social Security Number) – For U.S. citizens and residents who pay taxes as individuals.
  • ITIN (Individual Taxpayer Identification Number) – For non-U.S. residents who are not eligible for an SSN but still need to pay U.S. taxes.
  • EIN (Employer Identification Number) – For companies, organizations, and other entities that need to pay taxes or hire employees.

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What Is an EIN?

An Employer Identification Number (EIN) is a federal tax identification number assigned by the IRS to businesses operating in the United States. It is closely tied to the TIN and is essential for tax reporting, banking, and business operations. Key Facts:
  • Required for most businesses, especially those with employees.
  • Used by corporations, partnerships, LLCs, nonprofits, trusts, estates, and other legal entities.
  • Sole proprietors without employees may not need an EIN but are strongly encouraged to get one.

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Entities That Require an EIN

  • All corporations and partnerships
  • LLCs with employees or multiple members
  • Sole proprietors with employees
  • Nonprofits, trusts, and estates
  • Certain other registered entities

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Entities That May Not Require an EIN

  • Sole proprietors with no employees and not taxed as a corporation
  • LLCs without employees and not taxed as a corporation

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Why EIN Verification Matters

An EIN is essential for businesses in the U.S. that are legally required to pay taxes. Even in cases where a Social Security Number (SSN) could be used, obtaining an EIN is highly recommended because:
  • Banking: Most U.S. banks require an EIN to open a business account.
  • Hiring: Mandatory for hiring employees.
  • Tax Filing: Required for filing business taxes.
  • Security: Separates personal and business finances for sole proprietors.
  • Growth: Simplifies future scaling and compliance.
Without an EIN, businesses may face unnecessary complications when expanding or managing operations.