Regulation CDSL TPIN eDIS

CDSL TPIN regime (eDIS)

From WebNotes, a public knowledge base. Last updated 20 May 2026. Reading time ~5 min.

The CDSL TPIN (Transaction PIN) regime, also known as eDIS (electronic Delivery Instruction Slip), is the authorisation framework that allowed CDSL demat-account holders to authorise sell orders electronically using a one-time PIN, replacing the physical DIS slip system. It was the dominant authorisation mechanism for retail sell orders for several years before being progressively replaced by the CDSL block mechanism .

What TPIN is

TPIN is a 6-digit PIN issued to the demat account holder by CDSL. It serves as the holder’s electronic signature for delivery authorisation.

Use cases:

Sell orders on CDSL-held shares.
Pledge creation / release.
Inter-demat transfers (in some cases).

Before TPIN, every sell order required a physical DIS slip to be filled, signed, and submitted to the broker. TPIN automated this.

How TPIN was used

For a Zerodha sell order on CDSL-held shares:

Place sell order on Kite.
TPIN prompt appears (if eDIS authorisation is needed).
Enter TPIN in the CDSL flow.
OTP confirmation sent by CDSL to the registered mobile.
Enter OTP to authorise.
Sell trade executes as normal.

The flow took about 30-60 seconds per session (TPIN + OTP combined). For active traders, this added friction to every sell trade.

Improvements over physical DIS

Aspect	Physical DIS	TPIN / eDIS
Speed	Slow (paper)	Fast (electronic)
Risk of forgery	Real concern	OTP + TPIN protects
Bulk operations	Difficult	Easier
Auditability	Paper trail	Electronic record
Convenience	Low	Medium

TPIN was a significant step forward but still added friction per trade.

Limitations of TPIN

Per-trade friction

Active traders disliked entering TPIN + OTP for every sell trade. Several sells per day meant several authorisation flows per day.

Mobile dependency

The OTP step required a working mobile and SIM. Users on weak networks or with mobile issues faced delays.

Phishing risk

Phishing attacks sometimes targeted TPIN credentials. Users were urged to enter TPIN only on legitimate CDSL flows.

DDPI: an alternative

The Demat Debit and Pledge Instruction (DDPI) framework offered a “one-time consent” alternative: the user signed a one-time authorisation, after which the broker could trigger sells on the user’s behalf without per-trade TPIN.

DDPI was widely adopted as a less-friction alternative to per-trade TPIN.

Replacement by block mechanism

In 2024-25, the CDSL block mechanism progressively replaced TPIN / eDIS for sell-side settlements:

Sell trades trigger shares blocked in the seller’s demat.
No TPIN / OTP required per trade.
Settlement happens via block-release at T+1.

This is the cleaner architecture aligned with SEBI’s direct-payout framework.

What TPIN is still used for

Even after the block mechanism rollout, TPIN remains relevant for:

Pledge / un-pledge authorisation for margin collateral.
Inter-demat transfers initiated by the user.
Specific authorisation cases where block doesn’t apply.
Backup authorisation if block-mechanism flow fails.

For most retail users on Zerodha post-block-mechanism rollout, TPIN is no longer needed for routine sells.

TPIN setup

To set up TPIN:

Go to CDSL myeasi portal or via your broker’s flow.
Verify identity (PAN, demat ID).
Receive TPIN via SMS or email.
Store TPIN securely.

Most brokers help with the setup during account onboarding.

NSDL parallel: SPEED-e

NSDL has a similar electronic-authorisation framework called SPEED-e (or SDR). Same concept, different operator.

For demat accounts on NSDL, the parallel flow with SPEED-e applies. Account opening at most brokers gives you CDSL or NSDL based on the broker’s setup; once chosen, the corresponding eDIS / SPEED-e framework applies.

Security best practices

If you still use TPIN:

Never share TPIN with anyone (not even broker support).
Use only legitimate CDSL channels for TPIN entry.
Treat TPIN like a banking password.
Report suspicious TPIN prompts to CDSL and your broker.

External references

References

SEBI, Authorisation mechanisms for retail sell orders, circulars 2018-2024.
CDSL, TPIN and eDIS framework, cdslindia.com.
NSDL, SPEED-e framework, nsdl.co.in.
Zerodha Support, Selling shares with TPIN authorisation, support.zerodha.com.

Reviewed and published by

WebNotes Editorial Team

The WebNotes Editorial Team covers Indian capital markets, payments infrastructure and retail investor procedures. Every article is fact-checked against primary sources, principally SEBI circulars and master directions, NPCI specifications and the official support documentation published by the intermediary in question. Drafts go through a second-pair-of-eyes review and a separate compliance read before publication, and revisions are tracked against the SEBI and NPCI rule changes referenced in the methodology section.

Last reviewed: 20 May 2026
Conflicts of interest: WebNotes is independent. No relationship with any broker, registrar or bank named in this article.