A prospective client under ABA Model Rule 1.18 is anyone who consults with a lawyer about possibly hiring them for a specific legal matter, even when no representation ever forms.1American Bar Association. Rule 1.18: Duties to Prospective Client That status carries real weight. The lawyer cannot use or reveal what was shared, and in some situations cannot later represent an opposing party in a related matter. The rule exists so that people can speak candidly during an initial meeting, which is the only way both sides can figure out whether the fit is right.
Who Counts as a Prospective Client
The threshold is a consultation about a particular legal matter. A person becomes a prospective client by discussing with a lawyer the possibility of forming a lawyer-client relationship with respect to that matter.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment The key word is “consult.” A general question at a party about how divorces work probably does not qualify. A sit-down conversation where someone describes their marriage, assets, and custody goals almost certainly does.
Whether an exchange amounts to a consultation depends on the circumstances. It can happen in person, over the phone, or through email or an online portal. What matters is whether both sides are engaged in a two-way exchange about a specific legal problem. The official comments to Rule 1.18 note that consultations are typically short and limited in depth, leaving both parties free to walk away, but they still create protections for the person who shared information.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
The status attaches regardless of what happens next. You are a prospective client even if the lawyer declines the case, quotes a fee you cannot afford, or discovers a conflict ten minutes in. No retainer needs to be signed. No fee needs to change hands. The rule focuses on what happened during the conversation, not what happened afterward.
What Does Not Create Prospective Client Status
Not every contact with a lawyer creates obligations under Rule 1.18. Three situations sit outside the rule.
An unsolicited communication does not count. If someone sends an email dumping their entire case history on a lawyer who never invited that information, the sender is not a prospective client. There has to be a reasonable expectation that the lawyer is willing to discuss possibly taking the case.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
Responding to general advertising is also not a consultation. A person who submits information after seeing a website or ad that merely describes the lawyer’s background, practice areas, and contact details has not consulted with the lawyer. That kind of advertising does not invite case-specific submissions the way a detailed intake form does.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
Bad-faith contact is excluded as well. Someone who reaches out to a lawyer solely to disqualify that lawyer from representing an opposing party is not a prospective client. Courts and ethics boards recognize this tactic and refuse it the rule’s protections.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
The line between general advertising and an active invitation for case details is where most modern disputes sit. A website that says “Contact us to tell us about your case” and provides an open text box is inviting submissions in a way that can create prospective client status. A website that only says “Call to schedule an appointment” is not. The Comment makes clear that when a lawyer specifically requests or invites information about a potential case without warnings limiting the lawyer’s obligations, a consultation is likely to have occurred if someone responds.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
Confidentiality After the Meeting Ends
Under Rule 1.18(b), a lawyer who learns information from a prospective client cannot use or reveal that information, even if no formal relationship ever forms.1American Bar Association. Rule 1.18: Duties to Prospective Client The duty applies regardless of how brief the initial conversation was. A five-minute phone call that goes nowhere still generates confidentiality obligations for the lawyer regarding whatever was discussed.
The rule ties this duty to the same standard that governs former clients under Rule 1.9. That cross-reference matters. Rule 1.9 prohibits a lawyer from using information to the disadvantage of a former client and from revealing that information, with narrow exceptions: the information has become generally known, or another Model Rule permits or requires disclosure.3American Bar Association. Rule 1.9: Duties to Former Clients By pegging prospective client protections to that standard, Rule 1.18 effectively makes the duty indefinite. It does not expire when the consultation ends, when the lawyer changes firms, or when years pass.
The permanence has a practical point. If people feared that a lawyer who declined their case could later use what they said against them, few would speak honestly during a first meeting. The rule creates room for the kind of candid disclosure that both sides need. The person has to share enough for the lawyer to evaluate the case, and the lawyer needs enough to check for conflicts and decide whether the matter fits the practice.
When the Lawyer Cannot Represent the Other Side
Confidentiality alone does not fully protect a prospective client. Rule 1.18(c) adds a separate layer. If a lawyer received information from a prospective client that could be significantly harmful to that person, the lawyer cannot later represent someone with opposing interests in the same or a substantially related matter.1American Bar Association. Rule 1.18: Duties to Prospective Client This disqualification extends to every lawyer in the firm, not just the one who took the initial call.
Two phrases in that rule do most of the work.
Significantly Harmful Information
“Significantly harmful” sits higher than merely confidential. Not everything a prospective client shares triggers the conflict restriction. The question is whether the specific information, if used by an adversary, could cause real prejudice in the matter at hand. Information that is embarrassing or personally sensitive but irrelevant to the legal dispute generally does not qualify. The ABA has noted that this is a fact-based inquiry, depending on the length of the consultation and the nature of what was discussed. That standard is what makes Rule 1.18 less restrictive than the rules governing current or former clients, where adverse representation in related matters is often barred automatically regardless of what information was shared.
Substantially Related Matters
The conflict restriction only applies when the new representation involves the same matter or one that is substantially related. Two matters are substantially related when there is a real risk that confidential information from the first interaction would be useful in the second. If a prospective client discussed a commercial lease dispute and the lawyer later wants to represent the landlord in that same dispute, the connection is obvious. If the same lawyer wants to represent the landlord years later in an unrelated tax matter, the matters are likely not substantially related, and the conflict restriction would not apply.
Two Ways the Firm Can Still Take the Adverse Case
When a conflict does arise, Rule 1.18(d) gives a firm two paths forward rather than forcing it to turn the new client away.1American Bar Association. Rule 1.18: Duties to Prospective Client
Written Informed Consent
Both the prospective client and the affected client can agree to let the firm proceed. The consent has to be informed, meaning both sides understand the risks, and it has to be confirmed in writing. In practice, this route is often hard. The prospective client who was turned away has little reason to help the firm represent their adversary. Where the information shared was limited or the prospective client is indifferent to the outcome, consent may still be obtainable.
Ethical Screening
If consent is unavailable, the firm can avoid disqualification by screening the conflicted lawyer. Three conditions all have to be met:
- The lawyer who spoke with the prospective client must have taken reasonable steps to avoid learning more than was necessary to decide whether to take the case.1American Bar Association. Rule 1.18: Duties to Prospective Client
- That lawyer must be walled off from any involvement in the matter and cannot receive any share of the fee from it.
- The firm must promptly send written notice to the prospective client describing the screening measures in place.
The “reasonable measures to avoid exposure” requirement is where firms usually stumble. If a lawyer spent two hours in a deep consultation absorbing the prospective client’s entire litigation strategy, a screen alone will not save the firm. Screening only works when the initial conversation was kept narrow, which is why the Comment urges lawyers to gather only the information reasonably needed to check for conflicts and decide whether to take the case.2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
What Happens When the Rule Is Broken
The most immediate consequence is disqualification. When a lawyer or firm takes on a representation that conflicts with duties owed to a prospective client, the prospective client can move to disqualify. On that motion, the person seeking disqualification carries the burden of showing two things: that the new matter is the same as or substantially related to the one discussed during the consultation, and that the lawyer received information that could be significantly harmful.
Disqualification motions hurt. They derail the current representation, generate significant legal fees, and damage the firm’s relationship with the client that hired it for the conflicting matter. A lawyer who violates Rule 1.18 is also subject to professional discipline by the state bar or disciplinary authority that adopted the rule. The Model Rules do not prescribe specific sanctions; those are set by each jurisdiction’s disciplinary process and can range from a private reprimand to suspension or disbarment depending on the severity of the violation.
Whether a prospective client can also pursue a civil malpractice claim for a Rule 1.18 breach is a murkier question. The Model Rules state that they are not designed to serve as a basis for civil liability. Courts sometimes still consider violations of the professional conduct rules as evidence of the standard of care in malpractice actions. A prospective client who suffered actual damages from a lawyer’s misuse of confidential information would have a stronger claim than one who experienced no tangible harm.
How This Compares to Duties Owed to Actual and Former Clients
Prospective clients receive meaningful protection, but not as much as actual or former clients. The Comment describes the arrangement plainly: prospective clients “should receive some but not all of the protection afforded clients.”2American Bar Association. Rule 1.18 Duties to Prospective Client – Comment
The biggest difference is the conflict trigger. For current and former clients, a lawyer is generally disqualified from adverse representation in a substantially related matter regardless of whether the information received was particularly damaging. For prospective clients, the conflict restriction only kicks in when the information could be significantly harmful. A brief, surface-level consultation that never went into sensitive territory leaves the lawyer free to represent an adverse party in a related matter. That would not be true if the person had been an actual client.
The confidentiality duty, by contrast, is essentially the same. Rule 1.18(b) ties it directly to Rule 1.9’s standard for former clients: no using the information to the person’s disadvantage, no revealing it, no expiration date.4American Bar Association. Rule 1.9: Duties to Former Clients The screening mechanism available under Rule 1.18(d) is also more forgiving than what applies to former clients, where screening is not universally accepted as a cure for imputed conflicts. The rule protects the person who walked through the door without letting a single conversation paralyze an entire firm.