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Plain-English definition

What is ISIN?

An International Securities Identification Number is a 12-character identifier assigned to a specific security or mutual-fund option.

Reviewed by Kshitij Jain, Principal Officer · SEBI Investment Adviser INA000022172 · Updated 24 October 2026

How ISIN works

Different plan or payout options can have different ISINs even when their display names look similar. The identifier is useful when matching statements, transactions and data across systems.

An example

A direct-growth option and an IDCW option of the same scheme may carry separate ISINs because they are distinct units.

Why it matters for your family

Use the ISIN to avoid confusing near-identical names during reconciliation or transfer, but still verify investor, plan and transaction details.

Questions people ask

What does ISIN mean?
An International Securities Identification Number is a 12-character identifier assigned to a specific security or mutual-fund option.
Why does ISIN matter for a family?
Use the ISIN to avoid confusing near-identical names during reconciliation or transfer, but still verify investor, plan and transaction details.
Where can I verify information about ISIN?
Start with SEBI Investor, linked on this page, and the current official document for the product or tax year involved.

This page is general education, not personalised investment or tax advice. Rules can change; verify current official documents before acting. Investment in securities markets is subject to market risk.