Billing for AI-Assisted Work in a NJ Small Firm: Is Charging Your Hourly Rate Still Ethical?

A solo attorney in a New Jersey family law practice told me recently that she'd started using an AI research tool for case law summaries and motion drafting. She saved roughly two hours per client matter. Then she asked me the question I've been hearing more often: "Am I supposed to charge less now?"

It's a fair question, and the ethics rules in New Jersey don't give you an easy out.

RPC 1.5 Is the Starting Point, Not the Finish Line

New Jersey RPC 1.5 requires that a lawyer's fee be "reasonable." The rule lists eight factors courts and disciplinary bodies use to evaluate reasonableness, including the time and labor required, the novelty and difficulty of the questions involved, and the results obtained. Notice what's first on that list: time and labor required, not time and labor billed.

If AI cuts a research task that genuinely required four hours down to thirty-five minutes, billing four hours at your standard hourly rate raises a real question. You didn't spend four hours. Your client didn't receive four hours of lawyer judgment. The tool did the retrieval and the first draft.

That said, the calculus isn't simple. The time the AI saves is not pure profit for the client either. You paid for the tool subscription. You spent time learning to prompt it well. You reviewed the output, caught the errors, and applied professional judgment the AI cannot supply. Those are all legitimate inputs into the value you delivered.

What the ABA and Other State Bars Have Said

The ABA's Formal Opinion 512, issued in July 2024, addressed generative AI directly. It confirmed that lawyers may not bill clients for time saved by AI when doing so would result in a clearly excessive fee. But it also acknowledged that lawyers may factor in overhead costs of AI tools, and may consider charging a flat fee or a separate technology fee, provided the client is informed.

New Jersey has not issued its own formal opinion on AI billing as of mid-2025. That gap matters. It means NJ attorneys are currently operating under the general RPC 1.5 framework, with ABA Opinion 512 as persuasive (not binding) guidance. The NJSBA's Committee on the Unauthorized Practice of Law and its Professional Responsibility Committee have both been active on AI questions generally, so a formal opinion specific to NJ is likely coming. Don't wait for it to get your billing practices in order.

Three Billing Models Worth Considering

Hourly with a mental adjustment. Some attorneys simply recalibrate: if the task took forty minutes with AI, they bill forty minutes. This is the most conservative and defensible approach under RPC 1.5. It's also, frankly, a short-term profit hit that most solos aren't excited about.

Value billing. Bill for the result, not the clock. A well-drafted motion to suppress is worth a specific amount to a client regardless of whether it took you three hours or forty-five minutes. Flat fees or matter-based pricing sidestep the AI-efficiency problem entirely, and many solo attorneys are moving this direction for exactly that reason. The client knows upfront what they'll pay. You keep any efficiency gain. Everyone's expectations are set in writing.

Fee plus technology cost allocation. Under ABA Opinion 512, charging a reasonable fee that reflects AI tool overhead costs is permissible, as long as it doesn't tip into excessive territory. Think of it the way law firms used to itemize Westlaw research costs. You can build a reasonable AI surcharge into your fee structure, but it needs to be disclosed in your retainer and tied to actual costs, not fabricated as a margin multiplier.

The Client Communication Problem Most Attorneys Are Ignoring

Here's what worries me more than the billing model itself. Most NJ solo attorneys are not telling clients they're using AI at all. That's a separate ethics conversation touching RPC 1.4 (communication), but it directly affects the billing piece. If a client later discovers that a task you billed at your full hourly rate took a fraction of the time because a tool did the drafting, and you never disclosed either the tool use or the time savings, you have a fee dispute waiting to happen, and possibly a disciplinary complaint.

The practical fix is to add two sentences to your retainer agreement. Something like: "This firm uses AI-assisted tools for certain research and drafting tasks. Fees reflect the professional judgment, supervision, and review applied to all work product, not solely the time spent on any individual task." That language doesn't commit you to any specific billing model. It does put the client on notice and give you a defensible foundation.

The Actual Next Step

Pull out your current retainer template and look for any language that defines how fees are calculated. If it references hourly time exclusively and says nothing about AI tool use, update it before you send it to the next client. Then decide, matter by matter, whether hourly, flat-fee, or a blended approach actually reflects the value you're delivering. RPC 1.5 gives you flexibility. Use it deliberately, not by default.