5 Best Tools to Verify an EIN Number [Free + Paid] - 2026

When you onboard a new vendor or contractor, verifying their EIN is a standard part of the process. It confirms that the business is legitimately registered with the IRS and helps you avoid compliance issues down the line.

There are several ways to verify an EIN. Some methods are free but require manual searching through government databases. Others use paid services or APIs that provide instant results and can handle bulk verification. The right choice depends on how many EINs you need to verify and whether you need real-time results.

This guide walks through five different verification tools, explains when verification is necessary, and helps you choose the approach that fits your business needs. Before anything, below are some basic details to ensure we are on the same page.

What is an EIN?

An Employer Identification Number (EIN) is a nine-digit number the IRS assigns to businesses for tax purposes. Formatted as XX-XXXXXXX, it functions like a Social Security Number but for business entities instead of individuals.

While EIN and Tax Identification Number (TIN) are sometimes confused, they're not quite the same. TIN is an umbrella term for any tax identifier the IRS uses, including Social Security Numbers for individuals. An EIN is the specific type of TIN used for businesses.

Why do companies need to verify a business’s EIN number?

Companies verify EINs primarily to meet Know Your Business (KYB) compliance requirements. These KYB regulations require companies to verify the identity and legitimacy of the businesses they work with.

EIN verification is a core part of this process. It confirms that a business is properly registered with the IRS and legally authorized to operate. Industries like banking, insurance, fintech, and B2B services must verify EINs to comply with anti-money laundering (AML) laws and avoid penalties for working with fraudulent or non-compliant entities.

5 Best tools to verify an EIN number

In one way or another, all EIN verification tools cross-reference the number against official records to confirm it's active and tied to a registered business entity, giving you instant confirmation without manual IRS lookups.

Let's explore which option fits your verification needs:

Tool #1: Search the SEC's EDGAR database

The SEC's EDGAR (Electronic Data Gathering, Analysis, and Retrieval) system is a free public database where you can verify EINs for publicly traded companies and those that file with the SEC.

All public companies are required to disclose their EIN in official filings, making this a reliable source for verification. Here are the exact steps to verify an EIN through EDGAR:

1. Go to the SEC's EDGAR search page at sec.gov/edgar/searchedgar/companysearch
2. Enter the company name or ticker symbol in the search bar
3. Select the company from the search results
4. Look for recent filings like 10-K, 10-Q, or registration statements
5. Open the filing and search for "EIN" or "Employer Identification Number."
6. The EIN is typically listed in the company information section near the top of the document

EDGAR is most useful for verifying large corporations and publicly traded entities, but it won't help with private companies or small businesses that don't file with the SEC.

Tool #2: Search the IRS nonprofit database

The IRS maintains a free searchable database called Tax Exempt Organization Search (TEOS) that lists all tax-exempt organizations in the United States, including their EINs.

To start, go to irs.gov/charities-non-profits/tax-exempt-organization-search, and enter the organization's name, location, or EIN. That’s probably it. Review the search results to find the matching nonprofit.

💡 Note: This tool is specifically designed for 501(c)(3) organizations and other tax-exempt entities. Hence, standard for-profit businesses won't appear in this database.

Tool #3: Check Secretary of State databases

Every state maintains a business registry through its Secretary of State's office, where companies must register to operate legally. These databases contain business entity information, including EINs for many registered businesses.

To verify an EIN through state records, search "[State name] Secretary of State business search" to find your state's official business entity database. Enter the business name or registration number, review the entity details, and look for the EIN or Federal Tax ID field if available.

Tool #4: Request a credit bureau report

Business credit bureaus like Dun & Bradstreet and Equifax Business maintain comprehensive records on millions of companies, including their EINs, credit history, and operational details.

When you request a business credit report, it typically includes verified identifying information like the EIN, business address, ownership details, and financial standing.

These reports are highly reliable because credit bureaus continuously update and verify data through multiple sources. However, they're not free. Reports can cost anywhere from $50 to several hundred dollars, depending on the level of detail you need.

Tool #5: Use automated EIN verification APIs

Automated EIN verification APIs provide the fastest and most scalable way to verify business EINs in real-time.

These tools connect directly to authoritative data sources and return instant verification results through simple API calls that integrate seamlessly into your existing systems.

Here's how the EIN verification API compares to other tools we just discussed:

The best part: Rather than having employees leave your system to search EDGAR or Secretary of State websites, APIs embed verification into your existing onboarding forms, payment processing systems, or CRM platforms.

This means verification happens automatically at the point of need, whether that's during vendor registration, contractor signup, or payment approval, without adding extra steps for your team or delays for your partners. With that said, let’s now explore some of the best EIN verification APIs out in the market.

"Our AP team was calling the IRS for every new vendor EIN, waiting on hold for hours. Signzy's API verifies everything in under 10 seconds with 30+ business data points included. We onboard vendors same-day now instead of same-week, and suppliers love the faster approval process." — Director of Accounts Payable, Regional Bank.

Best EIN verification APIs – 2026 rankings

Several EIN verification APIs are available in 2025, each designed for different business needs. Here's a breakdown of the top options:

#1. Signzy EIN Verification API

Signzy's EIN Verification API checks EINs against official IRS databases and provides comprehensive business information. It's built for companies that need more than just basic EIN matching.

Signzy EIN verification API key features:

• Accurate data from government sources: Information comes directly from official databases with full coverage across all 50 states
• Detailed business profiles: Access 30+ data points, including business name, address, contact details, licenses, and legal records
• Bulk checking: Upload multiple EINs at once and get results in seconds
• Quick setup: Most companies integrate the API and go live within a few weeks
• Risk alerts: Get notified about issues with businesses you've already onboarded

Signzy works well if you need a complete KYB solution that includes EIN verification plus additional checks like ownership verification, watchlist screening, and bankruptcy monitoring.

“Someone submitted a valid EIN that belonged to a completely different company in another state. We processed three invoices before catching it. Signzy's verification now matches the EIN to the business name and address automatically. Haven't had a mismatch incident since implementation 14 months ago." — Fraud Prevention Manager, B2B Marketplace

#2. EIN Finder (Judy Diamond Associates)

EIN Finder has a database of over 14 million business records and specializes in matching EINs to business names. You can use it through a dashboard or integrate it via API.

EIN Finder (Judy Diamond Associates) key features:

• IRS match scores: See whether the IRS has verified that an EIN matches a specific business name
• Reverse lookups: Enter an EIN to find the company name and contact information
• Bulk matching: Upload lists of EINs and get matches for all of them at once
• Extra business details: Get addresses, industry codes, and phone numbers
• Automated integration: Connect it to your systems so verification happens automatically

EIN Finder is useful if you need detailed business intelligence for due diligence or sales research.

#3. EINsearch

EINsearch offers access to over 20 million EINs through both a web dashboard and API. It's one of the more affordable options available. It is best for businesses with moderate verification needs that want to keep costs down and don't require the freshest data.

The catch: Data updates can take up to three months, so it's not ideal if you need real-time verification.

#4. REALSearch B2B EIN Verification API

REALSearch delivers EIN verification optimized for speed and simplicity in B2B transactions. The API integrates directly into existing systems and focuses on providing fast verification responses without additional complexity. It's designed for companies that need reliable EIN matching as part of their business workflows but don't require extensive additional data points or ongoing monitoring features.

What information can you get from EIN verification?

When you verify an EIN, you typically receive a range of business data that helps you assess legitimacy and make informed decisions. This includes:

1. Business legal name: The official registered name on file with the IRS
2. EIN match status: Confirmation that the EIN corresponds to the provided business name
3. Business structure: Entity type such as LLC, Corporation, Partnership, or Sole Proprietorship
4. Registration status: Whether the business is active, inactive, or dissolved
5. Registered address: Primary business location on file with government agencies
6. Formation date: When the business was officially registered
7. State of incorporation: Which state the business entity was formed in
8. NAICS code: Industry classification code indicating business type
9. Tax-exempt status: For nonprofits, whether they have 501(c)(3) or other tax-exempt designation
10. DBA names: "Doing Business As" names, if different from the legal name

💡 Note: Keep in mind that basic EIN verification will not give you information about beneficial owners, financial performance, credit history, or detailed legal proceedings. For comprehensive due diligence, you will need additional KYB tools that include watchlist screening, UBO (Ultimate Beneficial Owner) verification, bankruptcy checks, and lien searches.

When is EIN verification absolutely necessary?

EIN verification should happen at important touchpoints where business legitimacy and compliance matter most. Below are the key instances when companies need to verify EINs:

🤝 During vendor and contractor onboarding: Before establishing any business relationship, verify the EIN to confirm you're working with a legitimate, IRS-registered entity. This is your first line of defense against shell companies or entities operating without proper authorization. Many companies make this part of their standard onboarding checklist, requiring EIN verification before granting system access or processing the first payment.

💳 Before processing payments or extending credit: Fraudsters often use fake or stolen EINs to receive payments and disappear. Verification confirms the business exists, is actively registered, and has a legitimate banking relationship.

📋 When filing tax forms like 1099s: Verify EINs before submitting tax documentation to the IRS, particularly 1099-NEC and 1099-MISC forms for contractors and vendors. The IRS cross-checks EINs against its records, and mismatches trigger penalty notices. It also attracts backup withholding. If you've paid a vendor throughout the year but their EIN is invalid or doesn't match their business name, you'll face rejection notices and scramble to correct filings.

🔄 As part of ongoing compliance monitoring, Businesses can dissolve, change ownership, lose their active status, or face compliance issues over time. Regular re-verification (quarterly or annually, depending on risk) ensures your records stay current and compliant. This is particularly important for high-risk industries, long-term vendor relationships, and companies subject to strict regulatory oversight.

Why use Signzy's API for EIN verification?

Signzy's EIN verification API stands out because it's designed for businesses that need more than just basic tax ID validation. While other tools stop at confirming whether an EIN is valid, Signzy integrates EIN verification into a complete compliance ecosystem that covers both business and individual verification.

Pay-as-you-go pricing

Signzy offers flexible pricing that scales with your verification volume. Instead of committing to expensive monthly subscriptions or per-seat licenses, you pay only for the verifications you actually run. This makes it accessible for startups verifying a few dozen businesses per month, mid-sized companies processing hundreds of checks, or even enterprises handling thousands of verifications.

Augment with KYC for complete stakeholder verification

Signzy lets you extend EIN verification to include Know Your Customer (KYC) checks on the people behind the business. Once you've verified a company's EIN, you can immediately verify the identities of beneficial owners, directors, or authorized signers using document verification, biometric checks, and liveness detection.

This is important for industries like lending or fintech, where you need to know not just that the business is legitimate, but also that the individuals representing it are who they claim to be. The combined KYB+KYC approach gives you complete visibility at both the entity and individual level.

"We were using Secretary of State databases manually for each vendor across 12 different states. Different portals, different search methods, massive time sink. Signzy handles all 50 states through one API call. What took our team 4 hours weekly now happens automatically during vendor registration." — Compliance Officer, Equipment Leasing Company.

Fully compliant with ISO standards and regulations

Signzy maintains ISO 27001 and SOC 2 compliance, which means your data is protected by the same security standards used by major financial institutions.

The platform uses 256-bit SSL encryption for all data transmission and offers 24/7 security monitoring to detect and respond to threats in real-time. Signzy also complies with FATF (Financial Action Task Force) guidelines, ensuring your EIN verification processes meet global anti-money laundering standards.

Whether you're operating in the U.S., Europe, the Middle East, or Asia, Signzy's infrastructure is designed to keep you compliant with local regulations while providing consistent verification quality worldwide.

To know more about how exactly Signzy’s EIN verification API works, book a demo here.