Instruction ID
The unique number the DP system generates for each off-market delivery instruction it enters, which the DP writes on the instruction slip for future reference.
In plain language
When an investor gives an off-market delivery instruction, the DP does not simply carry it out and forget it. Once the instruction is accepted into the DP system, the system generates its own reference number for it — the instruction ID.
The DP writes this number on the instruction slip, so the transaction can always be traced back to a specific system entry later.
How it works
From Chapter 8, section 8.2: the transferor submits a DIS with the "off-market trade" box ticked, specifying an execution date. If the form is complete and in order, the DP enters the instruction in the DP system, which then generates an 'instruction ID' for that instruction. The DP writes this instruction ID on the instruction slip for future reference.
On the execution date, if adequate balance exists, the instruction executes immediately. If not, it waits until the end of the execution day. In NSDL, the account is debited immediately once adequate balance is received; in CDSL, the account is debited after predefined intervals of time once adequate balance arrives. In both depositories, if adequate balance never arrives by the end of the execution day, the instruction fails.
A worked example
Mrs Aggarwal submits a DIS to transfer 300 shares off-market to her brother, marking the execution date as 15 July. Her DP checks the form, finds it complete, and enters it into the DP system, which generates instruction ID NSDL/OMT/00487213.
On 15 July, her account has only 250 of the required 300 shares free at the start of the day; the remaining 50 arrive from a separate settlement later that afternoon. Because her account is with an NSDL DP, the transfer executes immediately once the full 300-share balance becomes available, rather than waiting for a further cycle.
Had the 50 shares never arrived by end of day, the instruction would simply fail, and she would need to submit it afresh.
Why NISM asks about it
Chapter 8, section 8.2, introduces the instruction ID as part of the standard off-market settlement flow. Expect a question on what the instruction ID identifies (a specific instruction entered in the DP system) and on the NSDL/CDSL difference in how a delayed-balance instruction is finally executed.
Common exam traps
- The instruction ID is generated by the DP system on entry, not by the client filling out the DIS.
- NSDL debits immediately on receiving adequate balance; CDSL debits after predefined intervals — a genuine NSDL/CDSL difference, not interchangeable.
- If adequate balance never arrives by end of the execution day, the instruction fails in both depositories — there is no indefinite carry-forward.
- Do not confuse instruction ID with DRN (a dematerialisation-specific number) or pledge sequence number (pledge-specific) — each transaction type gets its own kind of reference number.
Where this is taught
Free preparation for NISM Series VIRelated terms
- Delivery Instruction SlipThe signed form on which a beneficial owner instructs the DP to debit the demat account — no beneficiary account can be debited without one, whether the transfer is on-market or off-market.
- Standing instructionA one-time authority, usually given at account opening, for the DP to credit securities into the account without a fresh instruction each time — the alternative is a Receipt Instruction for every single receipt.
- Execution dateThe date on which a depository instruction is to take effect: a DIS debit waits till the end of that day for balance and then fails; for allotments and corporate actions, the day credits are made.
- Off-market transactionA transfer of securities between two demat accounts on terms agreed between the parties, settled directly through the depository without a clearing member or clearing corporation.
- Receipt InstructionThe form a transferee submits to its own DP to accept one specific incoming credit into its demat account, needed only when no blanket Standing Instruction is already on file.