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How to Find and Verify Your Business NAICS Code

Compiled & reviewed by the EntityCodes Editorial Team (Tech Labs FZ LLC) · Data verified: 2026-06-28

Finding your business NAICS code involves identifying your primary revenue-generating activity and matching it against the official classification index published by the U.S. Census Bureau.

Determining Your Primary Revenue-Generating Activity

If your business engages in multiple business lines, federal contracting regulations require you to identify the activity that contributes the largest percentage of your overall corporate receipts ^[cfr-sba-13]. This rule is codified in 13 CFR § 121.107 to prevent companies from self-selecting codes solely to qualify for preferential contracting programs.

For example, if a firm earns 60% of its revenue from writing custom web software and 40% from database hosting services, its primary classification is Custom Computer Programming Services (NAICS 541511) rather than Computing Infrastructure Providers (NAICS 518210).

Step-by-Step Selection Process

Describe your business's core production process in specific terms.
Use our search tool or visit the U.S. Census Bureau NAICS page to search by keyword ^[1].
Identify the correct six-digit national industry code.
Cross-reference the selected code with the SBA Table of Size Standards to verify small business eligibility limits ^{[sba-size-standards]}.

Official Regulatory References & Mappings

To support the core compliance tasks detailed in this guide on How to Find and Verify Your Business NAICS Code, compliance officers and corporate attorneys must consult several official databases. The foundational structure of these codes is governed by the U.S. Census Bureau North American Industry Classification System (NAICS) Manual. Recent modifications and updates to these classifications are published formally in the Federal Register NAICS Update for 2022 Notice in the Federal Register. When preparing federal tax filings, these classifications map to specific activities under the guidance of the Internal Revenue Service (IRS) Instructions for Schedule C (Form 1040) Principal Business Activity (PBA) Codes. For government procurement, small business status is cross-referenced using the U.S. Small Business Administration (SBA) Table of Small Business Size Standards and the detailed regulations codified in the Electronic Code of Federal Regulations (eCFR) 13 CFR Part 121 - Small Business Size Regulations. International classifications are maintained by the United Nations and can be compared via the United Nations Statistics Division International Standard Industrial Classification of All Economic Activities (ISIC). Implementation policy directives are issued under the authority of the Office of Management and Budget (OMB) NAICS 2022 OMB Statistical Policy Directive No. 8. Labor and employment statistics are organized using the Bureau of Labor Statistics (BLS) NAICS Classifications in BLS Labor Statistics Programs, macroeconomic data is mapped to the Bureau of Economic Analysis (BEA) Industry Economic Accounts Guide and NAICS Usage, and local establishment counts are audited through the U.S. Census Bureau County Business Patterns (CBP) Economic Data Methodology.

💡 Expert Guidance: Keyword Search Misclassification

Relying purely on literal keyword searches in the Census index can lead to selecting incorrect codes. For example, search queries for 'consulting' return dozens of highly specialized codes (from management to environmental consulting). You must analyze the 'Cross-References' and exclusions listed under each code definition to confirm if your activity is redirected elsewhere.

Frequently Asked Questions

Can a business have more than one NAICS code? ▾

Yes. A business has one primary NAICS code representing its largest source of revenue, but can list multiple secondary codes in its SAM.gov profile for contracting purposes.

Where do I look up my official NAICS code? ▾

You can look up your code in our search index or consult the official directory on the U.S. Census Bureau website.

How do I determine my company's primary NAICS code if we have multiple business lines? ▾

Under SBA and federal procurement guidelines (13 CFR § 121.107), you must evaluate which business activity contributes the largest percentage of your company's gross receipts or employs the largest number of workers. That primary activity determines your official primary NAICS classification.

What are the legal risks of misclassifying my business NAICS code? ▾

Self-selecting an incorrect NAICS code to qualify for small business set-aside contracts or favorable SBA loan programs is considered misrepresentation. This can lead to size protests from competitors, contract termination, suspension from government contracting, or legal penalties under the False Claims Act.

Where can I search for my business's official NAICS code online? ▾

You can use the instant client-side search box on our homepage, browse our NAICS directory, or search the official U.S. Census Bureau NAICS keyword index to match your production activities with the standard codes.

How often should I review and update my declared NAICS codes? ▾

You should review your NAICS codes annually, especially before renewing your SAM.gov profile. If your business expands into new service lines or shifts its primary revenue source, you must update your registrations to reflect the current primary code.

Do commercial banks verify NAICS codes during account creation? ▾

Yes, commercial banks verify your primary NAICS code during account creation to satisfy federal Know Your Customer (KYC) and Anti-Money Laundering (AML) regulatory compliance. They use this code to categorize the risk profile of your industry.

What is the role of State Secretaries of State in assigning NAICS codes? ▾

State Secretaries of State typically require you to declare a NAICS code or a brief business description when filing articles of organization for an LLC or corporation. This is used for state-level tax categorization and statistical tracking.

Does my primary NAICS code affect my business insurance premiums? ▾

Yes, insurance underwriters review your primary NAICS code to evaluate the operational risks of your industry. High-risk categories (like construction or manufacturing) will yield higher liability and worker's compensation rates than low-risk service categories.

How can I appeal a NAICS code assignment on a federal contract solicitation? ▾

If you believe a federal contracting officer has assigned an incorrect NAICS code to a contract solicitation, you must file a formal NAICS appeal with the SBA Office of Hearings and Appeals (OHA) within 10 calendar days of the solicitation release.