Free Company Code Lookup – SIC, NAICS, CPV, ISIC
Easily find your company's official classification code. Whether you need a SIC code for UK Companies House, a NAICS code for US business filings, or CPV/ISIC codes for procurement and trade, this free tool helps you find the right code instantly.
AI-Powered Tool: This tool uses AI to suggest business classification codes. While we strive for accuracy using official data sources, results are recommendations only. Please verify with relevant regulatory authorities before using for official purposes.
What Are SIC, NAICS, CPV, and ISIC Codes?
SIC (Standard Industrial Classification)
Used in the UK for Companies House, HMRC, and business registrations. Every UK company must provide a SIC code when registering with Companies House. These 4-digit codes help categorize business activities for official reporting and statistical purposes.
NAICS (North American Industry Classification)
Used in the US and Canada for tax, industry analysis, and compliance. NAICS codes are 6-digit numbers used by federal statistical agencies to classify business establishments and analyze economic data.
CPV (Common Procurement Vocabulary)
Used across the EU in public tenders to categorise goods and services. CPV codes are essential for businesses participating in European public procurement, helping buyers identify relevant suppliers for specific contracts.
ISIC (International Standard Industrial Classification)
A UN system used globally to group business activities. ISIC codes provide international comparability of economic statistics and are used by many countries as their national classification system.
Why Businesses Need These Classification Codes
Tax Filings & Registrations
Ensure correct reporting to HMRC, IRS, or other tax authorities. Classification codes help determine applicable regulations, tax rates, and reporting requirements for your business sector.
Compliance & Certifications
Certain industries require proof of classification for licenses, permits, and professional certifications. Accurate codes ensure you meet regulatory requirements.
Funding Applications
Many grants and loans use SIC/NAICS codes to assess eligibility. Government funding programs often target specific industry sectors using these classification systems.
Tenders & Procurement
Public and private sector buyers use CPV and SIC codes to shortlist suppliers. Having the correct codes increases your visibility in relevant procurement opportunities.
How to Use Our Free Company Code Lookup Tool
Enter a Business Description
Describe your business activity in plain English (e.g., "IT consulting," "catering," or "construction").
Browse Suggested Codes
Our AI analyzes your description and provides matching codes across SIC, NAICS, CPV, and ISIC systems.
Copy Relevant Codes
Select and copy the codes you need for business filings, registrations, or tender applications.
💡 Pro Tip: Try searching with different terms to see multiple code matches. For example, search for both "software development" and "computer programming" to compare results.
Frequently Asked Questions
What is a SIC code in the UK?
A SIC code identifies the nature of your business activity for Companies House and HMRC. All UK companies must provide at least one SIC code when registering, and it affects your corporation tax obligations and statistical reporting.
What is the difference between SIC and NAICS codes?
SIC codes are primarily used in the UK and are 4-digit codes, while NAICS is the North American system used in the US and Canada with 6-digit codes. They classify similar business activities but have different structures and applications.
Do I need a CPV code for my business?
You'll need a CPV code if you want to participate in public sector tenders in the EU. CPV codes help procurement officers identify suppliers for specific goods and services, making it essential for government contracting.
Is this business code lookup tool really free?
Yes, Buybill provides this classification code lookup service completely free to support businesses. There are no hidden fees, registration requirements, or usage limits.
How accurate are the AI-generated code suggestions?
Our AI uses official classification databases and provides high-accuracy suggestions. However, we recommend verifying codes with relevant authorities before using them for official purposes, especially for critical applications like tax filings or major contracts.
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How It Works
Describe Your Business
Simply describe what your business does in plain English, or enter an existing code you want to convert.
AI Analysis
Our AI analyzes your description and matches it against official classification databases.
Get All Codes
Receive accurate SIC, NAICS, ISIC, and CPV codes for your business with detailed explanations.