> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.idenfy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# TIN and EIN Verification

> Verify business tax identifiers worldwide — VAT for EU and EIN for US companies — using dedicated tax identification fields in iDenfy KYB workflows.

## How the System Handles Tax Identifiers

When building a KYB workflow, you configure which tax identifier your clients must provide by selecting a field from the **Tax Identification** section — a dedicated section in the workflow builder, separate from Business Information. You can choose exactly one field per workflow:

| Field                               | Typical market | Validation performed                   |
| ----------------------------------- | -------------- | -------------------------------------- |
| **VAT Number**                      | EU             | VAT validation for 27 EU member states |
| **EIN**                             | United States  | EIN verification                       |
| **TIN (Tax Identification Number)** | Global         | No automated validation                |
| **Tax ID Number**                   | Global         | No automated validation                |

The end user sees the label of the field you selected. The [AI Reviewer](/guides/dashboard/settings/ai-reviewer) supports all four field types for automated data comparison steps.

### 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

<Note>
  EU Balkan members **are** included: Bulgaria (`BG`), Croatia (`HR`), Romania (`RO`), and Slovenia (`SI`) all receive VAT validation.
</Note>

### 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?

***

## 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."*

### Add a Tax Identifier to Your KYB Workflow

When creating a custom KYB [**workflow**](/guides/dashboard/setup/setup-workflow), go to the **Tax Identification** section and select the field that matches your market (VAT Number, EIN, TIN, or Tax ID Number). Only one field can be active per workflow.

Once configured, this field will be **mandatory** for the companies in that workflow. After setup, you can create a verification session:

* **Via the dashboard**
* **Through an API call**

### 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

<Note>
  **Limitation**

  EIN / TIN **does not work** as a standalone feature, and **can not** be used outside the KYB verification
</Note>

<img src="https://mintcdn.com/idenfy/K_tRuchpbv9NvRL_/images/guides/tin-ein-verification--59846bb4-0a12-4bf3-8c5f-b4e260679c5d.png?fit=max&auto=format&n=K_tRuchpbv9NvRL_&q=85&s=6805305bb7019151c268dccbce74c254" alt="image-20250904-105312.png" width="1405" height="1108" data-path="images/guides/tin-ein-verification--59846bb4-0a12-4bf3-8c5f-b4e260679c5d.png" />

***

<img src="https://mintcdn.com/idenfy/K_tRuchpbv9NvRL_/images/guides/tin-ein-verification--image-20250904-105312.png?fit=max&auto=format&n=K_tRuchpbv9NvRL_&q=85&s=0cc29f160bf6ded1408f4f14e94dd4a6" alt="image-20250904-120551.png" width="1000" height="627" data-path="images/guides/tin-ein-verification--image-20250904-105312.png" />

***

## Understanding TIN and EIN

## What Is a TIN?

A **Tax Identification Number (TIN)** is a unique number used by [**tax authorities**](https://www.irs.gov/businesses/employer-identification-number) 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.

***

## 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.

***

## 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

### 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

***

## 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.