The rule in Missouri
In Missouri, dual agency is permitted with written consent, but a dual agent may not disclose the terms of prior offers.
What it’s called: dual agent / designated broker.
Citation: RSMo 339.730, 339.750, 339.780.
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The required form
The conflict in a multiple-offer situation
When the listing agent also represents one of the buyers, every other buyer will wonder whether that buyer saw something they didn’t. Even with both clients’ consent, a dual agent owes confidentiality to each side and can’t use one buyer’s offer to help another.
Prior-offer disclosure: RSMo 339.750(5): a dual agent shall not disclose 'the terms of any prior offers or counter offers made by any party' without consent.
Missouri’s rule on sharing offers still applies to everyone: A listing (limited) agent may disclose with seller consent; the statutory bar on disclosing 'the terms of any prior offers' applies to dual agents only. See the Missouri disclosure rule →
Designated agency as the alternative
Missouri allows the brokerage to appoint a separate agent for each client (dual agent / designated broker). In a multiple-offer situation, that’s the cleaner setup: the buyer’s agent never sees the other offers, and the listing agent never advises the buyer.
Questions
Is dual agency legal in Missouri?
In Missouri, dual agency is permitted with written consent, but a dual agent may not disclose the terms of prior offers.
Can a dual agent disclose other offers in Missouri?
A dual agent may not disclose one buyer’s offer terms to another without consent (RSMo 339.750(5)). The seller must also authorize any disclosure, under Missouri’s disclosure rule.
What form is required for dual agency in Missouri?
Broker Disclosure Form (RSMo 339.770).
General information, not legal advice. Confirm with your broker or your state real estate commission.