AI in Law & Legal Services · AI and Attorney Professional Responsibility & Ethics

Must lawyers disclose AI use to their clients?

There is no single universal rule requiring disclosure of routine AI use, but some state bar guidance and billing practices call for disclosure in certain circumstances, such as when AI affects billing or outcomes.

Legal disclaimer

This page provides general information only and is not legal advice. Laws vary by jurisdiction and change over time. Consult a licensed attorney in your jurisdiction before making decisions based on this content.

Key takeaways

There is no single, nationwide ethics rule that requires attorneys to disclose every use of AI to every client.
Some state bar guidance suggests disclosure may be warranted when AI use is material to the client's matter, cost, or outcome.
Billing practices are a common flashpoint, since using AI to speed up a task raises questions about billing clients for time not actually spent.
Many law firms have begun addressing AI use directly in engagement letters or client communications to set expectations up front.

No single universal disclosure rule

Unlike some of the more settled areas of legal ethics, there’s no single, nationwide rule specifically requiring an attorney to disclose every instance of AI use to a client. Existing duties around client communication generally require attorneys to keep clients reasonably informed about their matter and to explain things sufficiently for the client to make informed decisions, and various state bars have begun interpreting how these existing duties apply specifically to AI use, rather than every jurisdiction adopting one identical disclosure standard.

When disclosure tends to be expected

Even without a single uniform rule, guidance from a number of state bars suggests disclosure becomes more clearly warranted in certain situations — for example, when AI use is material to the outcome of the matter, when it affects how the client is billed, or when a client specifically asks whether AI was used. This mirrors a broader ethical principle that has existed independent of AI: clients are generally entitled to understand significant aspects of how their matter is being handled, particularly anything that could affect cost or outcome.

Billing is a particularly active flashpoint

One of the most concrete disclosure-adjacent issues involves billing practices. If an AI tool allows an attorney to complete in minutes a task that would have taken hours manually, questions arise about whether it’s appropriate to bill a client based on the old, manual timeframe. This overlaps with existing ethical rules requiring that legal fees be reasonable, and it has led a number of firms to proactively address AI use and its effect on billing directly within engagement letters, aiming to set clear expectations with clients from the start of the relationship rather than navigating the issue after the fact.

Bottom line

There’s no single universal rule requiring attorneys to disclose every use of AI to clients, but existing duties around client communication and reasonable billing mean disclosure is often expected when AI use is material to a matter’s cost or outcome — a gap many firms are now filling through engagement letter language.

Go deeper

Important caveats

Guidance and best practices vary by state bar and by firm, and this remains an evolving area without full uniformity.
This is general information, not legal advice about a specific attorney's disclosure obligations to a specific client.

Frequently asked questions

Do clients have a right to know if AI was used on their matter?

Some bar guidance suggests clients should be informed when AI use is material to their matter, though there's no single universal rule requiring disclosure of every routine use of AI.

Does using AI mean a lawyer should bill clients less?

This depends on the firm's billing practices and any client agreement — using AI to complete a task more efficiently raises the same billing considerations as any other efficiency gain, and needs to be addressed consistently with existing billing ethics rules.

Are law firms adding AI-specific language to client agreements?

Many firms have started addressing AI use directly in engagement letters or client communications to set clear expectations from the outset of a matter.

Sources

[1]Model Rules of Professional Conduct and ethics guidance — American Bar Association
[2]Legal industry news and technology coverage — Law.com

Written by Editorial Team

Last updated July 28, 2026

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