S.W.I.F.T. messages are identified in a consistent manner. They all start with the literal "MT" which denotes Message Type. This is then followed by a 3 digit number. The first digit represents the Category. A category denotes messages grouped together because they all relate to particular financial instruments or services. The full list is as follows:
| MT0nn | System Messages |
| MT1nn | Customer Payments |
| MT2nn | Financial Institution Transfers |
| MT3nn | FX, Money Market & Derivatives |
| MT4nn | Collections and cash letters |
| MT5nn | Securities Markets |
| MT6nn | Precious Metals & Syndications |
| MT7nn | Documentary Credits & Guarantees |
| MT8nn | Travellers Cheques |
| MT9nn | Cash Management & Customer Status |
The second digit represents the Group denoting that the messages are related to similar parts of a transaction's lifecycle. For example:
| MT200 | Financial Institution Transfer, Own Account |
| MT202 | Financial Institution Transfer, Third Party |
| MT521 | Receive (Securities) Against Payment |
| MT523 | Deliver (Securities) Against Payment |
The last digit is the Type and denotes the individual message. There are several hundred message types across the categories in total.
A special subset of Messages is known as the Common Group because the last two digits represent the same message in each category. For example:
| MTn99 | Free format |
| MT299 | Free format relating to transfers |
| MT599 | Free format relating to securities |
| MT999 | General free format |
Other common group messages are:
| MTn90 | Advice of charges, interest, etc |
| MTn91 | Request for Payment of Charges, etc |
| MTn92 | Request for Cancellation |
| MTn93 | Directory Services |
| MTn95 | Query |
| MTn96 | Answer |
| MTn98 | Proprietary Message Envelope |
Each message is assigned unique identifiers. A 4 digit session number is assigned each time the CBT logs in. Each message is then assigned a 6 digit sequence number. These are then combined to form an ISN (Input Sequence Number) from the CBT to S.W.I.F.T. or an OSN (Output Sequence Number) from S.W.I.F.T. to the CBT. It is important to remember that terminology is always from the perspective of S.W.I.F.T. and not the user.
The Logical Terminal Address (12 character BIC), Day, Session and Sequence numbers combine to form the MIR Message Input Reference and MOR Message Output Reference respectively.
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