Quick answers
- Certificate of Incorporation — the legal proof that your company exists, issued by the ROC.
- CIN — the 21-digit Corporate Identification Number printed on the COI.
- Issued together — both are emailed the moment SPICe+ is approved.
- Quote everywhere — the CIN must appear on letterheads, invoices and ROC filings.
- Permanent — neither the COI nor the CIN expires; CIN only changes if listing status or state changes.
What is the Certificate of Incorporation?
The Certificate of Incorporation (COI) is the official document issued by the Registrar of Companies confirming that a company has been legally incorporated under Section 7(2) of the Companies Act, 2013. It is conclusive evidence of the company's existence from the date mentioned on it.
Since SPICe+ became the unified form, the COI is issued digitally with the PAN and TAN endorsed on the same certificate.
What is the CIN?
The Corporate Identification Number is a 21-character alphanumeric code allotted to every company at incorporation. It is unique, permanent, and used by the MCA to identify the entity throughout its life.
The CIN is printed on the COI and must be quoted on letterheads, invoices, notices, annual returns and every filing made with the ROC.
How to read the 21-digit CIN
| Section | Digits | Meaning |
|---|---|---|
| Listing status | 1 char | L = listed, U = unlisted |
| Industry code | 5 digits | NIC code for main business activity |
| State code | 2 chars | State of registered office (e.g., MH, KA) |
| Year | 4 digits | Year of incorporation |
| Ownership | 3 chars | PTC = private, PLC = public, FTC = foreign, etc. |
| Registration No. | 6 digits | Sequential number assigned by the ROC |
Where you must use the CIN
- Letterheads, bills, invoices, receipts and notices under Section 12(3)(c).
- All ROC filings — AOC-4, MGT-7, DIR-3 KYC, SH-7, etc.
- Bank account opening and KYC for the current account.
- GST registration application and ongoing GST returns.
- Director resignations and any communication with the MCA.
Common mistakes to avoid
- Treating the COI as a one-time use document — banks and counterparties keep asking for it.
- Not displaying CIN on invoices and letterheads — Section 12 penalty.
- Misreading the state code — CIN changes if registered office moves to another state.
- Confusing CIN with PAN or TAN — they are different numbers from different authorities.
Penalties for non-display
Failure to print the CIN, registered office address and contact details on letterheads, invoices and official communications under Section 12(3) and 12(8) of the Companies Act, 2013 attracts a penalty of Rs 1,000 per day, up to Rs 1,00,000 on the company and every officer in default.
Key takeaways
- The COI is conclusive proof of incorporation under Section 7(2).
- The CIN is a 21-character unique ID issued at the same time.
- Each segment of the CIN encodes listing status, industry, state, year, ownership and serial.
- The CIN must appear on every official document of the company.
- Both are permanent and free; reissues cost only the ROC's nominal fee.
Frequently asked questions
- What is the difference between the COI and CIN? The COI is the certificate; the CIN is the unique number printed on it.
- Is the CIN the same as PAN? No. PAN is issued by the Income Tax Department; CIN is issued by the MCA. Both appear on the COI.
- Can the CIN change? Yes — if the company changes its listing status (private to public) or its state of registered office, the CIN is re-issued.
- CIN kahaan dikhana zaruri hai? Letterheads, invoices, notices, bank documents aur har ROC filing par.
- How do I get a duplicate COI? Apply on the MCA portal under 'Get Certified Copies' and pay the prescribed fee.
- Does the CIN expire? No. The CIN is permanent for the life of the company.
- What is the penalty for not quoting the CIN? Rs 1,000 per day of default, up to Rs 1 lakh, under Section 12(8).
- Where can I verify a CIN? On the MCA portal's 'View Company / LLP Master Data' page using the CIN as input.
About the author
Rohit
Senior Advisor at Regikart. Want to discuss this in the context of your business?
