EIN Lookup and Verification API

An Employer Identification Number (EIN) is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to businesses, non-profits, and other entities for tax identification purposes in the United States. It functions similarly to a social security number but is used for organizations and businesses.

An EIN is crucial for various activities, including:

• Opening a business bank account
• Hiring employees
• Filing tax returns
• Conducting certain financial transactions

It helps the IRS identify and track businesses and organizations for tax reporting and compliance.

No. An EIN and a CID (Company ID) are not the same.

• EIN (Employer Identification Number): A government-issued tax identification number assigned by the US Internal Revenue Service (IRS) to uniquely identify businesses for tax and regulatory purposes.
• CID (Company ID): A Company Identification Number (CID) is assigned to a business at the time of formation, once its articles of organization or incorporation are approved by the U.S. Secretary of State used for general business purposes.

An EIN can be validated using a combination of technical checks and trusted verification tools:

• Format validation tools — These tools verify whether the EIN follows the correct 9-digit numeric structure (commonly written as XX-XXXXXXX). They help quickly catch invalid or incorrectly entered EINs but do not confirm ownership or existence.
• Business document matching tools — EINs can be validated by matching them against official business documents such as IRS notices, tax filings, or incorporation records to ensure the EIN aligns with the company's legal name and registration details.
• Government and authoritative data sources — EIN validation tools can cross-check the EIN against trusted government-backed or verified business databases to confirm that the EIN is active and correctly associated with the business entity.
• EIN Verification APIs — APIs automate EIN validation by combining format checks, business identity matching, and source verification in real time. These are commonly used by banks, fintechs, and compliance teams during onboarding and KYB workflows.

Signzy's EIN Verification API is a tool to verify the validity and accuracy of Employer Identification Numbers (EINs).

Signzy's EIN API validates whether an EIN is active, legitimate, and associated with a registered U.S. business, using official and trusted data sources. It also returns core company details to support KYB and onboarding workflows.

The EIN Verification API can be used standalone, but can also be plugged into Signzy's full KYB workflow, including business registry checks, UBO verification, document OCR, and AML screening.

The API supports all 50 U.S. states, enabling EIN validation alongside Secretary of State registry data and related business records.

Signzy supports fallback validation mechanisms using multiple additional data sources and checks to ensure onboarding and KYB flows don't break.

Yes. Signzy's EIN Verification API is built to support U.S. KYB, AML, and CDD requirements, while also aligning with widely accepted data protection and security standards.

Signzy is compliant with GDPR, SOC 2, and ISO 27001 principles, ensuring secure data handling, access controls, auditability, and privacy-by-design across verification workflows.