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Yes, sometimes—but the billing method matters. A lawyer billing by the hour may charge for time actually spent using an AI tool and checking its output, but not for time the tool saved. Flat fees and AI-related expenses are judged under reasonableness standards and the applicable agreement and rules. Whether a lawyer must disclose AI use depends on the jurisdiction and circumstances; the basis for fees and expenses should be communicated to the client.
What can a lawyer charge for when using AI?
AI does not create a separate permission to charge a client. The relevant questions are what the lawyer agreed to do, how the fee is calculated, what work or expense was actually incurred, and which professional rules and client instructions apply. The American Bar Association’s Formal Opinion 512 (2024) applies the ABA Model Rules to generative AI. It emphasizes that fees must be reasonable and that hourly bills must reflect actual time spent. State rules and guidance may differ, and the ABA Model Rules are not themselves the final word for every lawyer or client.
For an hourly matter, the central distinction is between time the lawyer actually spends and time the tool saves. A lawyer can record actual time spent preparing inputs, using legal skill to shape prompts, supervising the tool, and reviewing, verifying, correcting, and applying judgment to its output. The lawyer cannot charge for hypothetical manual work that would have taken longer without AI.
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Formal Opinion 512 illustrates the point with a lawyer who spends 15 minutes entering relevant information into a generative-AI program to draft a pleading. The lawyer may charge for those 15 minutes and for the actual time spent reviewing the result for accuracy and completeness. The example is hypothetical; it is not a standard fee, minimum, or average review time.
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How does the billing method change the analysis?
| Billing method | What the lawyer may charge | Key limit |
|---|---|---|
| Hourly | Actual time reasonably spent on the client’s matter, including appropriate AI input and review. | Do not bill for time saved or for work not performed. |
| Flat fee | The agreed fee, if it remains reasonable in the circumstances and complies with the agreement and applicable rules. | A fee may be unreasonable if AI substantially reduces the work but the lawyer charges the same amount without regard to the circumstances. |
| Contingent fee | The fee provided by the agreement, subject to applicable reasonableness requirements. | AI use does not remove the obligation to assess whether the fee is reasonable. |
| AI-related expense | A properly disclosed, reasonable expense where local rules and the client agreement allow it. | General office overhead is not automatically a client-specific cost. |
Hourly fees: bill actual time, not a reconstructed alternative
For hourly billing, a lawyer should record time actually spent rather than estimate what the same task would have taken without AI. Suppose a lawyer uses a tool to produce a first draft quickly. The lawyer may charge for the actual time spent preparing matter-specific inputs and for substantive review, verification, edits, and application of legal judgment. The lawyer may not add the hours that a traditional manual draft might have required simply because that would have been the bill absent AI.
This is not a rule that every minute spent near an AI tool is billable. The work must be for the client’s matter, actually performed, and chargeable under the engagement terms and any applicable billing instructions. Time spent correcting a tool’s mistakes may be actual time, but whether it is reasonable to charge the client for that work depends on the circumstances and governing standards. A time entry should describe the legal work in a way that is accurate and understandable, rather than disguise AI use or imply work that did not occur.
ABA Formal Opinion 512 quotes an earlier ABA opinion’s principle that a lawyer who agrees to bill by hours expended does not meet the ethical duty by billing for more time than was actually expended on the client’s behalf. The practical point is straightforward: a lawyer’s hourly rate compensates for actual professional time, not for the value of an imagined slower workflow.
Flat and contingent fees: reasonableness still matters
A flat-fee arrangement is not converted into hourly billing just because the lawyer uses AI. The ABA opinion nevertheless applies the Model Rule 1.5 reasonableness analysis to flat and contingent fees. It cautions that a flat fee may be unreasonable if AI lets the lawyer complete the task much faster while the lawyer charges the same amount as when no AI was used. The result is not automatic: the fee, work, agreement, outcome, and other circumstances matter.
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North Carolina’s 2024 Formal Ethics Opinion 1 says a lawyer may consider a flat fee for AI-assisted document drafting if the amount is not clearly excessive and the client consents to that fee structure. That state opinion illustrates why a blanket rule such as “AI always requires a discount” or “an existing flat fee can never change” is too broad. Lawyers and clients should look at the actual scope and terms of the engagement and the rules governing the lawyer.
Contingent fees also require a reasonableness assessment. The fact that a lawyer used AI does not by itself determine whether a contingent fee is fair or permissible. The fee agreement and the circumstances remain central.
Can a lawyer pass AI software costs on to a client?
Not every AI charge is a client expense. ABA Formal Opinion 512 applies the reasonableness standard to generative-AI expenses and says the basis for an AI charge should be explained before billing. The key practical distinction is between the cost of running a law office generally and a cost specifically incurred for one client matter.
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The State Bar of California’s Practical Guidance for the Use of Generative Artificial Intelligence in the Practice of Law, updated May 14, 2026, says general-purpose AI subscriptions are typically overhead. It distinguishes those subscriptions from certain costs incurred specifically for a client matter and beyond general office operations. Under that California guidance, a separately charged matter-specific cost should be disclosed clearly, should reasonably reflect actual cost, and should not include a markup or profit element unless the client gives informed written consent.
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North Carolina’s 2024 opinion permits accurate, not clearly excessive AI-related expenses with client consent, preferably in writing. These examples are jurisdiction-specific; they do not establish a nationwide rule that every subscription can be passed through or that every AI expense must be absorbed by the lawyer.
- General-purpose subscription: Often treated as law-office overhead in California guidance, rather than a charge attributable to one client.
- Matter-specific service or expense: Consider whether it was actually incurred for that matter, whether the governing rules allow charging it, whether it is reasonable, and whether its basis was clearly disclosed.
- Markup or profit: California guidance calls for informed written consent before adding one to a matter-specific AI cost.
- Client billing rules: An engagement agreement, outside-counsel guidelines, or other client instructions may impose stricter limits than a general ethics rule.
A charge should be described according to what it actually represents. A lawyer should not label a routine subscription as a special client expense merely because the tool happened to be used on that client’s work.
What must the lawyer disclose—and when?
“Disclosure” can mean three different things: explaining the fee basis, telling the client that AI is being used, or putting AI terms in the engagement letter. They are related but not interchangeable.
Explain the basis for fees and expenses
ABA Model Rule 1.5(b), as discussed in Formal Opinion 512, calls for communicating the basis or rate of fees and expenses before or within a reasonable time after representation begins, preferably in writing. The opinion says that before charging for AI tools or services, a lawyer should explain the basis for that charge, preferably in writing. This fee communication is distinct from a universal obligation to announce every use of AI.
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There is no universal AI-use disclosure rule in the cited state guidance
Arizona’s guidance says it identifies no Arizona rule or opinion that requires disclosure for every AI use, while recommending disclosure and informed consent as best practice. It discusses written engagement-letter disclosure in circumstances such as entering confidential information, charging AI-related costs, or routinely using AI. California’s guidance takes a fact-specific approach: a lawyer should evaluate communication duties in light of the tool, risks, representation, and the client’s sophistication. Disclosure may be appropriate when AI materially affects decision-making.
That means the relevant question is not simply “Did the lawyer use AI?” Consider what the tool did, what information was provided, whether the tool materially affected advice or strategy, what risks or limitations were involved, and what the client reasonably needs to understand about the representation. A court order, client contract, or outside-counsel policy can also require or restrict disclosure regardless of the general guidance.
Use the engagement letter to make important terms clear
Arizona and California guidance support clear written communication in relevant circumstances, but the cited sources do not establish one nationwide requirement to include a particular AI clause in every engagement letter. California advises that fee agreements clearly communicate how fees are calculated and how AI factors into rates and costs. Arizona describes written engagement-letter disclosure as a best practice in specified situations.
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Does permission to bill for AI mean the lawyer can upload client information?
No. The authority to charge for work or an expense is separate from the authority to submit client information to an AI provider. ABA Formal Opinion 512 emphasizes competence and confidentiality, including the need to understand a provider’s security, retention, and confidentiality arrangements. Depending on the tool and circumstances, disclosure to the client and consent may be necessary.
Before entering client information, a lawyer needs to consider what data the tool receives, how the provider handles it, whether it may be retained or used beyond the immediate task, and whether the arrangement adequately protects the client’s information. The lawyer remains responsible for protecting confidentiality and for the resulting work, even when a vendor supplies the technology. Arizona guidance also treats confidentiality and consent as relevant to AI use; it does not suggest that billing permission alone resolves those issues.
California’s guidance further emphasizes that lawyers must review generated work for accuracy, including legal analysis and citations, and remain responsible for submissions to a court. AI use does not transfer professional responsibility to the tool or its provider.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsWhat should a client check on an AI-related bill?
A client who sees an AI-related entry can ask for a clear explanation without assuming that every such charge is improper. Review the engagement letter and any billing guidelines alongside the invoice, then identify whether the entry is for lawyer time, a flat or contingent fee, or a separate technology expense.
- Identify the fee structure. Determine whether the matter is hourly, flat-fee, contingent, or a combination. The rules for time saved apply differently from the reasonableness analysis for an agreed flat fee.
- For hourly entries, compare the task with actual time. Ask what work was performed and how much time was recorded. The relevant benchmark is time actually spent, including review—not an estimate of how long the task might have taken without AI.
- For a separate software charge, ask what the charge represents. Is it a general office subscription, a service incurred specifically for the matter, or another expense? Ask how the amount was calculated and where the agreement permits it.
- Check prior communications and consent. Look for written fee terms, explanations of AI-related costs, and any consent required by the applicable jurisdiction or agreement.
- Check outside restrictions. Review client billing guidelines, contractual restrictions on AI, court orders, and any required billing-system rules.
- Request an itemized explanation if needed. Ask the lawyer to clarify the work, time, or cost underlying a disputed entry and how it fits the fee agreement. A question about one charge does not by itself establish misconduct.
Which rules govern the answer?
The ABA’s Formal Opinion 512 interprets the ABA Model Rules, which provide a widely relevant framework but do not alone decide an individual lawyer’s obligations. State regulators adopt and apply their own rules, and state or local ethics committees may issue additional guidance as technology develops. The state examples above are not interchangeable: North Carolina Opinion 1 dates to 2024; the Arizona guidance page states that no formal state generative-AI ethics opinion had issued as of 2026; and California’s practical guide was updated and approved May 14, 2026.
For a particular bill, the controlling picture may also include the engagement agreement, client billing instructions, outside-counsel guidelines, court orders, and applicable professional rules. California specifically says lawyers must follow applicable client instructions or guidelines restricting AI use. If a client believes a charge conflicts with the agreement or a jurisdiction’s rules, the lawyer’s explanation and the relevant state bar or ethics authority are more useful starting points than a general internet rule.
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