How to Verify a Business Tax Number in the USA

To verify a business tax number in the USA, you primarily need to confirm the Employer Identification Number (EIN) assigned by the IRS or the state tax identification number issued by your state’s department of revenue. Verifying these numbers ensures that your business is properly registered for tax purposes and helps prevent fraud or errors in tax reporting.

Why this comes up / what goes wrong

Small-business owners often need to verify a business tax number when onboarding new vendors, applying for loans, or filing taxes. Mistakes like using an incorrect EIN or state tax ID can lead to rejected tax filings, delayed payments, or legal issues. Many owners rely on documents or verbal information without double-checking the numbers, which causes problems later. Verification helps confirm the number’s validity and that it matches the business name.

Step-by-step

1. Identify which tax number to verify:

• The federal Employer Identification Number (EIN) issued by the IRS.
• State tax identification numbers issued by your state’s department of revenue (if applicable).

1. Verify the EIN with the IRS:

• Businesses cannot verify EINs online publicly for security reasons.
• You can confirm your own EIN by checking IRS documents like the EIN confirmation letter, tax returns, or official correspondence.
• To verify a vendor’s EIN, ask them to provide a copy of their EIN confirmation letter or a recent IRS tax return showing the EIN.
• Alternatively, you can call the IRS Business & Specialty Tax Line at 800-829-4933 to verify EINs if you have proper authorization.

1. Verify state tax numbers:

• Visit your state’s department of revenue website.
• Use their business tax ID or sales tax permit lookup tools if available.
• Enter the business name or tax number to confirm registration and status.

1. Cross-check business details:

• Confirm the business name matches the tax number.
• Check the business address and type to ensure consistency.

1. Document your verification:

• Keep copies of verification results or correspondence.
• Note the date and source of verification.

Example (fictional figures)

A B2B software reseller in Denver, Colorado, called TechSolutions LLC, wants to verify its EIN before submitting tax documents.

• TechSolutions LLC’s EIN on file: 12-3456789
• They locate their IRS EIN confirmation letter dated 03/15/2010.
• They call the IRS Business & Specialty Tax Line, provide their business details, and confirm the EIN matches TechSolutions LLC.
• They also check the Colorado Department of Revenue website using their state sales tax ID 123456789 and confirm the business is registered and active.

This confirms their tax numbers are valid and correctly assigned.

Common mistakes

• Using unofficial sources: Avoid relying on third-party websites that claim to verify EINs; they may be outdated or inaccurate. Use IRS or official state resources.
• Not verifying both federal and state numbers: Some businesses need both EIN and state tax IDs. Check both to avoid incomplete verification.
• Ignoring business name mismatches: Always confirm the tax number matches the exact legal business name to prevent errors.
• Failing to document verification: Keep records of when and how you verified the number for future reference.
• Assuming verification is instant: Some state sites may take time to update; verify close to the time you need the confirmation.
• Not checking for status updates: A business tax number might be inactive or revoked; verify the current status.

For more on managing your sales and customer data efficiently, consider how a WhatsApp and SMS CRM or a built-in CRM dialer can help your small business stay organized.

Frequently asked questions

Can I verify a business EIN online with the IRS? The IRS does not offer a public online EIN verification tool for security reasons. You can verify your own EIN by reviewing IRS documents or call the IRS Business & Specialty Tax Line if authorized. For other businesses, ask for official documents.

How do I verify a state tax identification number? Check your state’s department of revenue website for business tax ID lookup tools. Enter the business name or tax number to confirm registration and status.

What if the business name does not match the tax number? A mismatch could indicate an error or fraud. Contact the business for clarification and verify directly with the IRS or state department.

Is it necessary to verify both federal and state tax numbers? Yes, many businesses operate under both federal EIN and state tax IDs. Verifying both ensures compliance and prevents issues in tax filings.

Can a tax number be inactive or revoked? Yes, tax numbers can be deactivated or revoked if a business closes or fails to comply with regulations. Always check the current status during verification.

For more guidance on managing your business operations, see HelloGrowthCRM for the United States.

Key takeaways

• Verify the federal EIN through IRS documents or authorized calls; no public online tool exists.
• Check state tax ID numbers via your state’s department of revenue website.
• Confirm the business name matches the tax number exactly.
• Document your verification process and keep records.
• Avoid unofficial sources and verify both federal and state numbers if applicable.
• Check the current status of the tax number to ensure it is active.

Start verifying your business tax numbers today to avoid tax filing errors and delays. To organize your sales and communications alongside, consider starting on the Free Forever plan (200 leads, no credit card) at HelloGrowthCRM.

This article is general information, not tax or legal advice. Rules change; confirm the current position with the IRS or your state's department of revenue, or with your CPA, before acting.