SWIFT MT Category 3 Messages for Corporates

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What is MT Category 3 Messages?

The category 3 Swift messages deal with Treasury Markets - Foreign Exchange, Money Markets and Derivatives.

One of the most used Cat 3 messages by a corporate is the MT 300.

MT 300: The Foreign Exchange Confirmation

The MT 300 is the industry-standard message used to confirm the details of a foreign exchange (FX) trade. It acts as an electronic trade confirmation between two parties (e.g., a Corporate Treasurer and a Bank) to ensure both sides agree on the terms of the deal before any money actually moves.

For a corporate treasurer, the primary use of the MT 300 is automated matching. When you book an FX trade in your Treasury Management System (TMS), your system sends an MT 300 to the bank. The bank sends their own MT 300 back to you. If the key fields match, the trade is "Confirmed"; if they don't, it is "Flagged" for investigation.

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MT 300 Key Fields for a Corporate Treasurer

The MT 300 is divided into sequences, but the following fields are the most critical for treasury operations:

1. The "Matching" Identifiers

Field 20 (Sender's Reference): The unique ID your system assigns to this trade.
Field 22A (Type of Operation): Indicates if this is a NEWT (New Trade), AMND (Amendment), or CANC (Cancellation).
Field 22C (Common Reference): This is a unique code (usually generated by the broker or matching platform) that both the bank and the corporate share. It allows systems to link the two independent messages together.

2. The Economic Details (Must Match Exactly)

Field 30T (Trade Date): The date the deal was agreed upon.
Field 30V (Value Date): The date the currency will actually settle (e.g., Spot + 2 days). If this mismatches, you risk overdrafts.
Field 36 (Exchange Rate): The agreed rate (e.g., 1.1050).
Field 32B (Currency & Amount Bought): What you are receiving (e.g., EUR 1M).
Field 33B (Currency & Amount Sold): What you are paying (e.g., USD 1.105M).

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3. Settlement Instructions (Where the money goes)

Field 57A (Receiving Agent): This tells the other party where to pay the funds.
Example: If you bought EUR, this field contains the BIC code of your EUR bank account. If this is wrong, the funds will go to the wrong place or get stuck.

4. Party Definitions

Field 82A (Party A): The Sender of the message (You).
Field 87A (Party B): The Receiver of the message (The Bank).

Summary of Flow

Treasurer agrees to buy €1M for $1.1M over the phone/platform.
Treasurer's System generates an MT 300 with NEWT, Rate 1.10, and sends it to the Bank.
Bank's System sends an MT 300 to the Treasurer with the same details.
Matching Engine compares Field 30T, 30V, 36, 32B, and 33B.
Result: If they match, the settlement instruction (Field 57A) is locked in for payment.

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Other Important MT Category 3 SWIFT messages

MT 304 (Advice/Instruction of a Third-Party Deal):

Used when a corporate executes an FX deal through a third-party platform or broker but settles it through their custodian; it instructs the custodian to settle the trade details agreed elsewhere.

MT 305 (Foreign Currency Option Confirmation):

Confirms the purchase or sale of a standard "vanilla" FX Option (Call/Put); treasurers use this to match strike prices, premiums, and expiry dates for hedging contracts.

MT 340 (Forward Rate Agreement Confirmation):

Confirms a Forward Rate Agreement (FRA) deal; used by treasurers to hedge against future interest rate movements by locking in a rate for a future period.

MT 360 (Single Currency Interest Rate Derivative Confirmation):

The standard message for confirming Interest Rate Swaps (IRS); treasurers use this to verify the schedule of fixed/floating leg payments on long-term debt.

MT 362 (Interest Rate Reset / Advice of Payment):

Sent by the bank to notify the treasurer of the new floating rate (e.g., SOFR/EURIBOR) for the next period of a loan or swap; critical for updating cash forecasts with the exact interest payment amount.

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