TPIN or DDPI: how does a sale get authorised?
TPIN and DDPI are two ways a broker is allowed to move shares out of your demat account when you sell. TPIN is a personal identification number from CDSL. You enter it, with an OTP, so that a sale can be debited. DDPI, the demat debit and pledge instruction, is a document you sign that lets the broker debit shares for market settlement, and pledge them when the wording allows, without asking for the TPIN on every order. It replaced the broader power of attorney brokers used to demand. It is still a permission. Read the bullets on the form before you sign the whole page.
What you are allowing
With TPIN alone, a sale waits until you authorise that debit. You will feel the extra step on volatile mornings, and you will also notice if something tried to move without you. Keep the PIN the way you keep a banking PIN. A screenshot in a chat is how it leaks. With DDPI, you have pre-authorised the debits the form lists. The usual point of it is settlement of a sale you placed, so the shares leave on time and you do not miss pay-in. It is not supposed to be a blank power to move shares anywhere the broker likes. If the form’s language is wider than sell-settlement and margin pledge, do not sign it because the app put a timer on the screen. You can refuse DDPI and keep using TPIN. The broker may make the sell flow slightly slower. That is a fair trade if you do not want a standing debit instruction. It is a poor trade if you miss pay-in and the exchange square-off costs you more than the inconvenience.
What this does not decide
TPIN and DDPI do not choose the annual charge, the brokerage, or whether the account is a BSDA. Those are on the tariff sheet. They also do not move your holdings to a new broker. That is a transfer, described in how to close a demat account after the shares have moved. Before you close, revoke a DDPI you no longer want in force, using the broker’s revocation process, so a dead account does not keep a live debit right.
Who should hesitate
Hesitate if you cannot see which actions the DDPI covers, in a list, on a document you can save. Hesitate if a relationship manager asks you to sign a power of attorney “like before” when the form in front of you is broader than DDPI. Hesitate if you rarely sell and the TPIN step does not bother you. The standing permission is for people who sell often enough that the PIN step is the operational risk, because a missed debit fails the settlement.
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Questions people ask next
Is DDPI mandatory?
No. You can authorise debits with TPIN and OTP. A broker can refuse to open an account on their own commercial terms, but the depository rules do not force you to sign a DDPI to own a share. If they insist, that insistence is their policy. You can use another broker.
Can I cancel DDPI later?
Yes. Use the revocation process and keep the acknowledgement. Until that acknowledgement exists, assume the debit right is still in force. Check a small holding is still in the account after you revoke.
Does the same choice exist for NSDL?
CDSL’s TPIN is the flow most discount brokers show. NSDL has its own authorisation steps. The principle is the same: either you approve the debit each time, or you have signed a limited standing instruction. Read the depository named on your client master report, and follow that depository’s screen, not a video filmed on the other one.