A CIN (Corporate Identification Number) is a unique 21-character code assigned by the Registrar of Companies (RoC) during company incorporation in India. The Ministry of Corporate Affairs (MCA) uses this code to identify companies in its official records and statutory filings, invoices, annual reports, and other legal documents.
A CIN also serves as a company registration number in India. Banks, clients, and government authorities use it to verify a company’s identity and check its registration details. Limited Liability Partnerships (LLPs) receive a Limited Liability Partnership Identification Number (LLPIN) instead, while partnership firms and sole proprietorships do not receive a CIN.
Key Takeaways
- A CIN is a unique 21-character code assigned by the Registrar of Companies (RoC) when a company is incorporated in India.
- The CIN serves as a company identification number in India. Its last six digits represent the RoC-assigned registration number.
- A CIN encodes the company’s listing status, industry code, state, year of incorporation, company type, and registration number.
- Under Section 12(3)(c) of the Companies Act, 2013, companies must mention their CIN on specified business documents. Noncompliance can attract a penalty of ₹1,000 per day, capped at ₹1 lakh for the company and ₹1 lakh for each officer in default.
- The MCA updates the CIN when an approved change affects its encoded details, such as the registered state, company type, principal business activity, or listing status.
- LLPs receive a Limited Liability Partnership Identification Number (LLPIN) instead of a CIN. Partnership firms and sole proprietorships do not receive either identifier.
What is a CIN Number?
The full form of CIN is Corporate Identification Number (commonly referred to as Corporate Identity Number or Company Identification Number). It helps regulators, banks, investors, and other businesses verify a company’s identity and legal status. Every registered company has a unique CIN, allowing the MCA and the ROC to track its filings, compliance history, and incorporation details throughout its lifecycle.
A company’s CIN number also contains key information, including:
- Listing status (listed or unlisted)
- Company type (Private Limited, Public Limited, Section 8, etc.)
- Industry code
- State of registration
- Year of incorporation
- Unique registration number
Under Section 12(3)(c) of the Companies Act, 2013, a company must print its name, registered office address, and CIN, along with its telephone number, fax number (if any), email address, and website address (if any), on all business letters, billheads, letter papers, notices, and other official publications.
Under Section 12(8), failure to comply attracts a penalty of ₹1,000 for each day the default continues, subject to a maximum of ₹1 lakh for the company and ₹1 lakh for each officer in default. For a One Person Company (OPC) or a small company, the penalty is halved to ₹500 per day, capped at ₹50,000 for the company and ₹50,000 for each officer in default.
CIN Number Format: 21-Character Structure Explained
The company registration number format in India follows a fixed 21-character structure, and each segment reveals specific information about the company.
Let’s take the CIN U62099KA2025PTC123456 as an example and break down what each part means:
| Part | Example | Length | Meaning |
| Listing status | U | 1 | L = Listed, U = Unlisted |
| Industry code | 62099 | 5 | Main business activity (NIC code) |
| State code | KA | 2 | State of registration (KA = Karnataka) |
| Year of incorporation | 2025 | 4 | Year the company was incorporated |
| Company type | PTC | 3 | Company category (PTC = Private Limited Company) |
| Registration number | 123456 | 6 | Unique number assigned by the RoC |
This CIN example identifies an unlisted private limited company in IT services, incorporated in Karnataka in 2025, with the registration number 123456.
Note: Some states and Union Territories have more than one state code used in CINs, so the code does not always correspond to a single, straightforward abbreviation.
Is CIN the Same as a Company Registration Number?
The CIN and company registration number are not exactly the same. However, in India, the company registration number is the six-digit number assigned by the RoC when a company is registered. It forms the last six digits of the CIN, which also encodes the company’s listing status, industry, state, incorporation year, and type.
The table below illustrates the difference using a sample company registration number:
| Term | Meaning | Example |
| Company registration number | The six-digit number at the end of the CIN | 054086 |
| CIN (Corporate Identity Number) | The full 21-character company identifier | L46524DL1993PLC054086 |
In practice, the terms are often used interchangeably. When a bank, client, or government form asks for a company’s registration number, it generally refers to the full CIN.
Importance of a CIN Number for a Company
After registering a company, the Registrar allots a CIN, which stays relevant throughout its life:
- Legal identification: It acts as the company’s legal ID in all MCA and RoC records, so government authorities and regulators can recognize it clearly.
- Statutory compliance: Companies quote their CIN in MCA forms, such as AOC-4 and MGT-7, and when filing tax returns in Form ITR-6.
- Stakeholder verification: Banks, investors, suppliers, and clients use the CIN to check a company’s registration and compliance status on the MCA portal.
- Traceable records: The CIN links all of the company’s filings, charges, and director changes, which makes due diligence faster.
Note: The RoC automatically assigns a CIN when it approves a company’s incorporation application filed through SPICe+ (INC-32). This CIN number of a company appears on the Certificate of Incorporation and is commonly listed on its letterheads and invoices.
To find a company registration number without these documents, you can check the CIN number online in India through the MCA portal by searching for the company by name. Alternatively, use our company details search tool to find the CIN and other company information.
Company Type Codes in a CIN
The three-letter code in a CIN shows the company’s legal category under the Companies Act, 2013.
| Code | Company Type |
| PTC | Private limited company |
| PLC | Public limited company |
| OPC | One Person Company |
| FTC | Private limited subsidiary of a foreign company |
| GOI | Government company (Central Government) |
| SGC | Government company (State Government) |
| NPL | Section 8 company (not-for-profit) |
| GAP | General association (public) |
| GAT | General association (private) |
| FLC | Financial lease company (public limited) |
| ULL | Public company with unlimited liability |
| ULT | Private company with unlimited liability |
Note: The company type code forms the 13th to 15th characters of the CIN. It changes when a company converts from one category to another, such as from a private limited company (PTC) to a public limited company (PLC).
What Company Information Can You Get With the CIN?
A CIN gives you free access to a company’s key details. Enter it in the MCA’s View Company/LLP Master Data service to see company details, including:
- Basic details: Company name, RoC, registration number, and the date of incorporation
- Company classification: Category, sub-category, and class, such as a private company limited by shares
- Current status: Whether the company is active, struck off, dormant, amalgamated, or under liquidation
- Capital structure: Authorized and paid-up share capital
- Registered office: The registered address and email ID on MCA records
- Compliance dates: The dates of the last annual general meeting (AGM) and the latest balance sheet
- Directors and signatories: Names, DINs and appointment dates of current directors
- Charges: Loans secured against company assets, with the charge holder, the amount and the charge status
While the company master data gives you these basic details for free, more detailed records, such as financial statements, annual returns, and incorporation documents, can be downloaded through View Public Documents V3 for ₹100 per company. If you need certified copies, the MCA charges ₹100 for the Certificate of Incorporation and ₹25 per page for other documents.
When Does a CIN Change/Rectify?
A company cannot apply to change its CIN directly. The MCA updates it when an approved change affects the information encoded in the number:
- Change of registered office to another state: The company must obtain Regional Director approval through Form INC-23 and complete the required registered office filings, including Form INC-22. The state code in the CIN then changes.
- Change in company type: Converting from private to public limited, or vice versa, through special resolution and Form INC-27 changes the company type code from PTC to PLC, or from PLC to PTC.
- Change in principal business activity: If an approved change in the company’s principal business activity results in a different primary NIC code, the five-digit industry code in the CIN changes. These digits occupy the 2nd to 6th character positions of the 21-character CIN.
- Change in listing status: When a company gets listed or delisted, the first character of the CIN changes from U to L, or from L to U.
In each case, only the affected segment changes. The six-digit registration number at the end of the CIN stays the same.
Example: Bannari Amman Sugars Limited updated its NIC code to 10721 (sugar manufacturing) in 2026. Its CIN changed from L15421TZ1983PLC001358 to L10721TZ1983PLC001358. Only the industry code changed. The listing status, state code, year, company type, and registration number all stayed the same.
Once the MCA updates the CIN, the company should use the revised number on its letterheads, invoices, notices, and future MCA filings. If the CIN displayed on any official document is incorrect, the company should rectify the error to keep its records consistent with MCA records.
CIN vs LLPIN vs FCRN vs PAN vs TAN vs GSTIN: Key Differences
Besides the CIN, businesses use several other identification numbers, and each serves a different purpose:
| Aspect | CIN | LLPIN | FCRN | PAN | TAN | GSTIN |
| Purpose | Identifies a company registered with the MCA | Identifies an LLP registered with the MCA | Identifies a foreign company registered in India | Identifies taxpayers for income tax | Identifies entities that deduct or collect TDS/TCS | Identifies businesses registered under GST |
| Format | 21 characters | 3 letters and 4 digits (e.g., AAA-1234) | Starts with the letter F (e.g., F01234) | 10 characters | 10 characters | 15 characters |
| Issued by | Registrar of Companies (MCA) | Registrar under the LLP Act, 2008 (MCA) | Registrar of Companies (MCA) | Income Tax Department | Income Tax Department | Central and State GST authorities |
| Who receives it | Companies incorporated under the Companies Act | Limited liability partnerships | Foreign companies with a place of business in India | Individuals and all business entities | Entities required to deduct or collect TDS/TCS | Businesses registered under GST |
| Used for | MCA filings and corporate compliance | LLP filings with the MCA | MCA filings by the foreign company | Income tax filings and financial transactions | TDS/TCS returns and payments | GST returns and invoicing |
Note: A foreign LLP registered in India receives a Foreign Limited Liability Partnership Identification Number (FLLPIN), while an LLP incorporated in India receives an LLPIN.
Common Mistakes to Avoid When Using or Verifying a CIN
Errors when using or verifying a CIN can lead to filing issues, compliance penalties, or confusion between companies. Avoid these common mistakes:
- Omitting the CIN from business documents: Section 12(3)(c) of the Companies Act, 2013, requires companies to mention their CIN on business letters, billheads, letterheads, notices, and other official publications.
- Entering an incorrect CIN in MCA filings: Check all 21 characters before submitting a form. A CIN is different from a company’s PAN or GSTIN, so do not use these identifiers interchangeably.
- Continuing to use an outdated CIN: Use the updated CIN after a change in registered state, company type, principal business activity, or listing status affects the number.
- Skipping counterparty verification: Check a vendor’s or client’s CIN on the MCA portal before entering into a business agreement. Review its registration details and current status.
- Relying only on the company name: Different companies can have similar names. Match the CIN with the company’s legal name and MCA records to verify its identity.
- Assuming a CIN confirms active status: A CIN alone does not establish that a company is currently active. Check the MCA master data for its current status before relying on the company for a transaction.
- Requesting a CIN from an LLP or firm: An LLP receives an LLPIN instead of a CIN. Traditional partnership firms and sole proprietorships do not receive either identifier, so request the appropriate registration details.
Conclusion
A CIN helps banks, clients, and regulators identify a company and verify its registration details. Using the correct, updated CIN on business documents and MCA filings helps prevent avoidable errors, delays, and compliance issues.
Whether you’re incorporating a new company, updating your CIN after a change in company details, or verifying a business partner’s records, RegisterKaro’s experts can assist with the required MCA filings. Contact our team for support with company registration and compliance.
