What it replaced
Before 2020, brokers collected a signed power of attorney that let them debit your demat account on instruction. The depository system replaced PoA with TPIN: a 6-digit code that authorises each transaction without handing anyone blanket powers. Shares cannot leave your account without either the TPIN or a separate formal process.
Where you will use it
Selling delivery shares, pledging shares for margin, and transferring shares to another demat account. Intraday and F&O trading never touches the demat, so those orders do not ask for the TPIN. If your broker’s app asks for the TPIN, you are doing something that moves shares, which is exactly when the check should appear.
Keeping it useful
Treat the TPIN like an OTP: never share it, never write it where someone can read it, and reset it in the app if you suspect it leaked. The depository sends you SMS and email confirmations for every demat debit, so a wrong debit shows up immediately.
TPIN versus the old PoA system
Before 2020, brokers collected a physical power of attorney over client demat accounts, which let them debit shares on instruction without per-transaction authorisation. SEBI replaced PoA with the TPIN system through its 2020 circulars: every demat debit now needs a 6-digit code held only by the account holder. The change removed the blanket authority brokers held, and the depositories enforce the check at the debit itself, not at the broker’s discretion.
If you suspect the TPIN leaked
Reset it in the broker app immediately, then review the last few days of demat debits in the CAS and in the app’s holdings history. The depository sends an SMS and email for every debit, so an unauthorised debit shows up in two places. If a debit you never authorised appears, raise a dispute with the broker the same day and escalate to the depository’s investor grievance channel if the reply is unsatisfactory.
A concrete example
You sell 10 delivery shares. The app asks for your TPIN before submitting the sell. You enter the 6-digit code, the order goes through, and NSDL or CDSL emails you a debit confirmation within minutes.
Questions people ask about TPIN
The broker app has a TPIN section where you set a 6-digit code after OTP verification. If you forget it, the same section resets it. The TPIN is yours alone; the broker cannot see it, and no genuine employee will ever ask you to share it.
It is needed for demat debits: selling delivery shares, pledging, and transfers. Intraday and F&O orders do not debit the demat, so they proceed without it. If an app asks for the TPIN, shares are about to move, which is exactly when the check should appear.
Yes. Pledging is a demat debit instruction under the September 2020 SEBI pledge rules, so the TPIN authorises it the same way it authorises a sell. Unpledging does not need the TPIN at most brokers because it moves securities back to you.
A small number, after which the TPIN locks for a cooling period and you reset it through the app with OTP verification. The lockout exists to stop brute-force attempts, and the reset path always runs through your own registered mobile and email.
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