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ExternalBalanceSubType1Code

BLCK Code: Blocked

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BLCK means blocked in the ISO 20022 balance sub type code set. Balance representing the regulatory reserve that a financial institution must have with the account servicing institution, eg, the minimum credit balance a financial institution is to keep with its Central Bank for mandatory reserve purposes. In some countries, a blocked balance is known as a 'reserve' balance.

Code
BLCK
ISO name
Blocked
Status
Registered
Last updated
2009-04-01

Official definition

Balance representing the regulatory reserve that a financial institution must have with the account servicing institution, eg, the minimum credit balance a financial institution is to keep with its Central Bank for mandatory reserve purposes. In some countries, a blocked balance is known as a 'reserve' balance.

Definition from the ISO 20022 External Code Sets, 2Q2026 (published 28 Aug 2026).

Messages and fields that use ExternalBalanceSubType1Code

MessageElement path
camt.053Stmt/Bal/Tp/SubTp/Cd
camt.052Rpt/Bal/Tp/SubTp/Cd
camt.060RptgReq/ReqdBalTp/SubTp/Cd

BLCK in other code sets

BLCK questions

What does BLCK mean in ISO 20022?
BLCK is Blocked in the ExternalBalanceSubType1Code code set: Balance representing the regulatory reserve that a financial institution must have with the account servicing institution, eg, the minimum credit balance a financial institution is to keep with its Central Bank for mandatory reserve purposes. In some countries, a blocked balance is known as a 'reserve' balance.
Where does BLCK appear in a message?
For example in camt.052, element Rpt/Bal/Tp/SubTp/Cd.

All ExternalBalanceSubType1Code codes · ISO 20022 code sets

The ISO 20022 code names and definitions on this page are reproduced from material published at iso20022.org under the ISO 20022 Intellectual Property Rights policy. This is not the official source: the up-to-date ISO 20022 standards and repository material are published only at iso20022.org. Explanations in our own words are by ZagTrader. ZagTrader is not affiliated with or endorsed by ISO or Swift.