Last reviewed: · Curated by Ohmyfin Organisation editorial.
Field 50K is the free-format Ordering Customer field on an MT103 — still widely used on older systems, but being replaced by the structured 50F variant. Draft an MT103 now →
Format specification: an optional account number preceded by a slash on line 1 (e.g. /12345678), followed by 1–4 lines of up to 35 characters each for the name and address. Example: first line /123456789, second line JOHN DOE, third line 123 MAIN ST, fourth line NEW YORK NY 10001 USA. The character set is the SWIFT X character set — letters, digits, and limited punctuation; no special characters, umlauts or accented characters.
Field 50K was the most widely used ordering-customer format for decades because it was flexible and easy to populate from legacy banking systems that did not have structured address databases. A free-format text field allows the bank to capture whatever the customer provided on the wire transfer form without needing to normalise or structure the data. However, this flexibility comes at the cost of machine-readability — automated compliance systems must parse 50K content heuristically, which introduces errors and false positives in sanctions screening.
The compliance cost of parsing free-format 50K text is one of the primary drivers for migration to 50F. Correspondent banks running automated sanctions screening may flag a 50K with an ambiguous name format (e.g. "SMITH JR JOHN T" vs "JOHN T SMITH JR") as a near-match against a sanctions entry, generating a false positive that requires manual investigation. A 50F with the name in tag 1/ and date of birth in tag 4/ allows the screening system to disambiguate the identity with high confidence.
Despite the migration to 50F, 50K remains widely used on older core-banking systems that have not been updated to produce structured MT103 data. Many regional banks in emerging markets still generate MT103 messages with 50K because their systems were built before 50F was introduced or because the upgrade project has been deprioritised. When Ohmyfin tracks a payment with a 50K ordering customer, the free-format content is displayed as-is without further parsing.
The practical guidance for organisations preparing MT103 payments: if your banking system supports 50F, use it. If you are stuck with 50K, ensure the content is as structured as possible — name on one line, street address on the next, city/state/postal code on the third, and country on the fourth. Avoid abbreviations, avoid splitting names awkwardly across lines, and always include the full country name or ISO country code on the last line to aid compliance screening.
| Example value | :50K:/12345678\nJOHN DOE\n123 MAIN ST\nLONDON GB |
|---|---|
| Valid characters / format | Account + 4 free-text lines |
| Required on MT103 | Mandatory |
| Required on MT202 | Not used |
| Required on pacs.008 | Mandatory |
| Notes | Unstructured ordering customer (legacy MT format). |
Yes — both individuals and companies use 50K. The free format is forgiving for different name styles, but harder to screen automatically. A company name like "ABC TRADING CO LTD" is entirely valid in 50K. Use a separate line for the company name and subsequent lines for the registered address.
50K is being progressively replaced by 50F as SWIFT's ISO 20022 transition matures. It is not being formally removed from the MT standard yet, but SWIFT guidance and regulatory requirements increasingly expect 50F for new implementations. Legacy systems using 50K should plan migration to 50F.
The SWIFT X character set: uppercase and lowercase letters (A–Z, a–z), digits (0–9), and the special characters: / - ? : ( ) . , ' + space and line break. No umlauts (ä, ö, ü), accented characters (é, ç), or other special symbols. These must be transliterated to ASCII equivalents before inclusion.
Up to 4 lines, each up to 35 characters. The first line is typically the account number (preceded by a slash) or the name if no account is being specified. Lines 2–4 carry name and address. If you need more space, you must abbreviate or truncate — the 4 × 35 character limit is a hard constraint of the MT103 format.
Line 1: /account number (if applicable). Line 2: full legal name of the ordering customer. Line 3: street address (number and street name). Line 4: city, postal code, and ISO country code. Keeping this structured layout — even though 50K is technically free-format — significantly improves automated screening accuracy at correspondent banks.
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