SWIFT MT103 Field 33B — Currency / Original Amount
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Field 33B is the Currency / Original Ordered Amount. It is used when the currency in field 32A differs from what the customer originally ordered (i.e. when an FX conversion happened before the payment was sent).
How an MT103 maps to the UETR (field 121), sender reference (field 20), value-date/currency/amount (field 32A) and beneficiary details. Source: SWIFT MT103 specification.
Details
Format: 3 letters (ISO currency) + amount. Example: 33B:EUR23000,00 means the customer originally instructed EUR 23,000 and the bank converted it to USD before sending.
Quick facts
SWIFT field specification
Example value
:33B:USD1000,00
Valid characters / format
3!a currency + 15d amount
Required on MT103
Optional
Required on MT202
Not used
Required on pacs.008
Optional
Notes
Original instructed currency/amount before FX.
Key facts
Optional, used when FX conversion was done
Format: 3-letter ISO currency + amount
Mandatory in EU SEPA-compliance contexts
Frequently asked questions
When is field 33B mandatory?
Whenever an FX conversion occurred between the customer instruction and the SWIFT message, or whenever the SEPA / EU regulatory framework requires it.
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