Overview

A demat account number is the identifier that links an investor to the shares, ETFs, bonds and mutual fund units held in electronic form. It is asked for in IPO applications, share transfers and many broker forms, and one wrong character can send a request to the wrong place. This guide explains what the number is, how it is structured, where to find it, how to open an account that gets one and what to do if it is lost. The account is maintained with a depository, CDSL or NSDL, through a registered depository participant (DP) that provides the account details.

What is a Demat Account Number?

A demat account number has 16 digits or characters, depending on the depository, and identifies a beneficial owner’s account. At CDSL it is a 16 digit demat account number made only of digits. It combines two parts: the DP ID, which identifies the depository participant (a bank, stockbroker or other financial institution), and the client ID, which identifies the investor’s account within that DP. Together they are called the BO ID, short for beneficial owner identification number, and the BO ID in demat account paperwork is what most forms ask for.

The number is not the same as the trading account number or the client code used on the exchange side. Jainam’s guide to demat account vs trading account explains how the two accounts work together.

Why Do You Need a Demat Account Number?

A demat account number identifies the account in which securities are held or transferred. It is commonly needed for:

• IPO applications: to identify the account where allotted shares should be credited.
• Off-market transfers: to identify the source and destination accounts. Jainam’s guide on how to transfer shares from one demat account to another shows where each detail goes.
• Corporate actions: to credit eligible bonus shares, split shares and other securities entitlements. Dividends are generally paid to the linked bank account.
• Account and authorisation processes: to identify the account in broker forms or depository authorisation procedures, which depend on the facilities the DP has enabled.

How is a Demat Account Number Structured?

The structure depends on the depository.

Detail	CDSL	NSDL
Account number format	16 numeric digits	16 characters, usually IN followed by 14 digits
DP ID	First 8 digits	First 8 characters, including IN
Client ID	Last 8 digits	Last 8 digits
BO ID	The full 16-digit account number	DP ID and client ID combined
Example (illustrative)	1204920001830421	IN30312312345678

*Examples are illustrative and not real accounts.

A CDSL demat account number is numeric and has no prefix, so it is the 16-digit number most people picture. An NSDL number starts with the letters IN, so it is 16 characters but not all digits. The prefix shows which depository holds the account, which matters in an inter-depository transfer. Jainam’s guide to the CDSL demat account covers the CDSL side in more detail.

The DP ID identifies a particular DP, and a broker may operate through more than one DP ID or entity. The client ID is unique to the account within that DP. In everyday talk, the BO ID in demat account records is simply called the demat account number. The DP ID and client ID are its two halves, and both are needed to identify an account fully.

What is the Purpose of a Demat Account Number in Trading?

A trading account is used to place buy and sell orders, while a demat account holds securities in electronic form. When a transaction results in delivery of shares, the settlement process uses the demat account details to credit or debit securities. The number also appears in records such as the Client Master Report (CMR), which is issued at account opening, and in holding statements.

How Do You Find Your Demat Account Number?

Step-by-Step Process to Locate Your Demat Account Number

1. Broker app or website: the profile, account details or demat section normally shows the DP ID, client ID and BO ID.
2. Account-opening documents: the welcome email, account confirmation or Client Master Report lists the details.
3. Statements: the holding statement or the Consolidated Account Statement (CAS) from CDSL or NSDL shows the account.
4. Depository services: the CDSL or NSDL investor facility can be used, subject to its registration and verification requirements. The information available depends on the portal.
5. Broker support: if the number cannot be found, the DP can be contacted through its official support channel after identity checks.

For anyone unsure how to find demat account number details, the broker app is the quickest route. PAN and other personal information should never be entered on an unfamiliar website that claims to retrieve a demat account number.

How to Open a Demat Account

A demat account number is issued once an account is opened and activated.

Required Documents for Opening a Demat Account

Requirements follow the KYC rules and vary by DP and onboarding method, so the broker confirms the exact list. Commonly asked for are:

• PAN card
• Aadhaar or another valid proof of address (see Jainam’s glossary on the Aadhaar card)
• Bank account proof, such as a cancelled cheque or a statement
• A photograph and signature, where the DP or onboarding method asks for them
• Income proof, only if derivatives trading is requested

Steps to Open Your Demat Account

1. Choose the DP and start the online application.
2. Verify the mobile number and email address.
3. Enter personal and bank details, and upload the documents.
4. Complete KYC, usually through Aadhaar-based OTP verification.
5. Sign the forms electronically and complete the bank verification.
6. Receive the account details, including the DP ID, client ID and login credentials, once the account is active.

Jainam lists online account opening at ₹0 and an AMC of ₹0 on its pricing page, which should be reconfirmed before applying. Its lifetime free demat account and demat account charges guides give the details.

What to Do If You Lose Your Demat Account Number?

Losing the number does not mean losing the shares, because the holdings are recorded with the depository against the investor’s identity. The fix is to retrieve the number:

• Check the broker app profile, the welcome email and old statements first. Knowing how to find demat account number records in a CAS makes this quick.
• Look at the latest CAS from CDSL or NSDL, which helps consolidate holdings and accounts.
• Contact the broker’s support through the registered mobile number if the details cannot be found.

If the account itself looks compromised, the broker should be contacted at once, and passwords and TPIN should be changed.

How Does a Good Demat Platform Help You Manage Your Account?

A good platform can keep the DP ID, client ID and BO ID in the profile, show holdings and statements in one place and simplify forms such as transfer instructions, with authentication through OTP or TPIN where the facility is enabled. Jainam’s published tools include its web platform and the Jainam Lite mobile app, and the exact features for viewing account details should be confirmed with the provider. Jainam’s guide on DDPI explains the authorisation used for selling shares from a demat account.

Conclusion

Knowing the CDSL and NSDL structures, where the number is recorded and how to retrieve it avoids errors in IPOs and transfers. The number should always be copied from the app, a statement or the CMR before it is used in a form.

Final Key Takeaways

• The demat account number, or BO ID, is the DP ID and client ID combined, 16 characters in total.
• A CDSL demat account number is a 16 digit demat account number with no prefix, while NSDL numbers start with IN followed by 14 digits.
• The number is shown in the broker app, welcome email, statements, the CMR and the CAS.
• A lost number can be retrieved, and the holdings are not lost.
• The OTP, TPIN, password and any signed blank delivery instruction slip should never be shared.

Investors who do not yet hold a demat account can open a demat account with Jainam. This is optional and separate from the guidance above.

Read our other Blogs!

Read more: Transmission of Shares Upon the Death of a Demat Account Holder
Read more: Lifetime Free Demat Account (AMC Free)
Read more: Corporate Demat Account: Features, Benefits, and Eligibility
Read more: How to File ITR-2 for Stock Market Income?