What Is an MT799 SWIFT Message — And When Should You Use One?

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Everyone in structured finance is familiar with it. Some believe it unlocks capital. Others think it replaces an SBLC. But very few truly understand its role, its limits, and its power when used correctly.
This guide will walk you through what an MT799 is, when it’s used, what it’s not, and how it fits within the larger SWIFT communication ecosystem, including the often-overlooked MT759.
If you’re involved in any SBLC-backed deal, project finance structure, or monetisation path, this is the clarity you’ve been looking for.
An MT799 is a free-format SWIFT message sent between banks. It’s commonly used to transmit pre-advice, proof of funds, or a confirmation of readiness ahead of a formal financial action, such as the issuance of a Standby Letter of Credit (SBLC) or Bank Guarantee (BG).
It belongs to SWIFT’s Category 7 message types, which cover documentary credits and guarantees. However, MT799 has no fixed structure—it’s a custom-written text.
The bank is essentially saying:
“We’re aware of the transaction. We acknowledge the terms. We’re preparing to move.”
However, this message does not transfer money, does not create a legally binding obligation, and does not constitute a financial instrument.
Over the years, I’ve seen MT799s used in legitimate ways inside serious deals. Here are the most common, appropriate scenarios:
The key theme? An MT799 always exists inside a larger structured deal. Never as a standalone tool.
Let’s address this directly. Despite what some intermediaries claim:
If someone tells you an MT799 will unlock $50M just by being sent, you’re not looking at a deal. You’re looking at a stall.
Here’s a simple breakdown to help you understand the real function of each message type:
More on MT759:
An MT759 is sent to confirm, amend, or update a previous message, typically the MT799 or MT760.
Think of it as the bank saying:
“We’re updating the terms.”
“This instrument is now active.”
“The conditions have changed.”
Few intermediaries talk about MT759, but in structured deals—especially those under compliance scrutiny—it’s a vital tracking tool.
In my experience, successful deals follow this progression:
This flow protects all parties and ensures the banks stay within their regulatory guardrails.
Before anyone in your deal requests an MT799, ensure you have:
If you can’t answer these questions, you’re not ready for any SWIFT messaging. And your deal may not be real.
An MT799 is a powerful tool when used within the proper structure.
Used correctly, it builds trust between counterparties.
Used carelessly, it wastes time and exposes everyone to risk.
If you’re being asked to provide or receive one, your next question shouldn’t be “Can we send it?”
It should be:
“Is this the next logical step in a bankable deal?”
If the answer isn’t clear, stop the deal and start with structure.
Book a Consultation: Build the Right Structure Before You Send the Right Message
At AltFunds Global, we help professionals navigate complex capital structures, instrument issuance, and SWIFT messaging.
We don’t just talk about MT799s.
We help you determine if you even need one, and what should come before and after.
Book your consultation today at http://www.altfundsglobal.com
Let’s get your capital strategy aligned before you start sending messages that mean nothing.
Because in real finance, clarity closes deals. Confusion kills them.
AltFunds Global helps real estate operators, family offices, and accredited investors build financial scaffolding for their deals.
Book a call today
and see how structure unlocks capital.
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