Billing for AI-Assisted Work at a NJ Small Firm: How Much Time Can You Actually Charge a Client?

A solo practitioner in Bergen County told me something that's stuck with me. She used an AI drafting tool to produce a first-cut motion brief in about an hour and a half. The same brief, without AI, would have been a six-hour project. Her hourly rate is $350. The old bill would have been $2,100. The new bill, if she charged actual time, comes to $525.

She asked me: "Am I obligated to pass that savings along to the client? Or am I leaving money on the table?"

It's the right question, and more NJ attorneys are asking it as AI becomes a real part of their workflow. The answer sits at the intersection of RPC 1.5, basic contract principles, and your own long-term credibility with clients.

What RPC 1.5 Actually Says About This

RPC 1.5(a) prohibits a fee that is "clearly excessive." The rule then lists eight factors courts and disciplinary bodies use to assess reasonableness, including the time and labor required, the skill required to perform the service, and the results obtained.

Notice that "time and labor required" is one factor among eight, not the whole test. New Jersey courts applying this standard have consistently looked at the overall reasonableness of the fee relative to the value delivered, not just the clock. That matters here.

So no, you're not automatically required to charge only for actual minutes logged. But you also can't ignore the time reduction entirely and pretend nothing changed. The key is whether the total fee is reasonable given the circumstances of the engagement.

The Fee Agreement Is Doing More Work Than You Think

If you're billing hourly and your engagement letter says you bill for "time spent," you've already created a problem for yourself. Charging six hours when you worked ninety minutes is a misrepresentation, full stop. That's not an RPC 1.5 issue alone; it starts to touch RPC 8.4(c), which covers dishonest conduct.

The cleaner solution is updating your fee agreement language. A few approaches that work:

Value-based hourly floors. Some attorneys are moving to a hybrid: they charge actual time, but set a minimum fee per matter type that reflects the skill, overhead, and AI licensing costs involved. The floor is disclosed upfront in the engagement letter.

Flat fees with AI baked in. If you're doing a lot of similar work (residential real estate closings, simple wills, LLC formations), AI efficiency maps naturally onto flat-fee billing. You set the flat fee based on the value to the client, not your input hours. The efficiency gain becomes your margin. This is clean, ethical, and clients generally prefer fee certainty anyway.

Transparent hourly billing with an AI surcharge. Some large firms have gone this route: charge actual time, add a separate line item for AI tool use (say, $25-$75 per matter). This is probably overkill for a solo or small NJ firm, and it invites client pushback. I don't recommend it unless your clients are sophisticated commercial entities who are already seeing this from BigLaw.

The Competence Dividend Argument

Here's a framing that I think is underused. When you use AI on a matter, you're not just saving time. You're typically producing a more thorough first draft, catching more issues on review, and reducing the chance of error. That's a quality input, not just a time input.

RPC 1.5 rewards results. If AI helps you deliver a better work product with less friction, that's a legitimate argument that your fee, even above actual AI-assisted hours, is reasonable. Document your reasoning. Note in your file that you reviewed and substantially edited the AI output, that you applied your legal judgment throughout, and what the AI tool actually produced versus what you delivered to the client.

That documentation isn't just protection against a grievance. It's the record that justifies your fee if a client ever challenges it.

What You Should Do Before Your Next AI-Assisted Matter

Update your engagement letter. Specifically, if you bill hourly, replace "time spent" with language like "fees reflect the time, skill, and resources required to complete the work, which may include AI-assisted drafting and research tools." Run that language by your malpractice carrier while you're at it. Some NJ carriers are starting to ask about AI use in renewal questionnaires, and a few have issued informal guidance that aligns with this kind of disclosure.

Set a policy for your own practice, in writing, before the billing question gets awkward with a client mid-matter. Decide now whether you're going hourly-actual, flat-fee by matter type, or some hybrid. Consistency is your best protection under RPC 1.5.

The Bergen County attorney I mentioned? She landed on flat fees for her motion practice, priced at roughly 70% of what her old hourly bills produced. Her clients are happier. Her margin is better. And she's not losing sleep over billing ethics.

That's not a coincidence. It's what happens when you get ahead of this before a client asks the question for you.