What the IRS Circular 230 AI Guidance Means for How Your Firm Bills

In June 2026 the IRS Office of Professional Responsibility published "Introductory Guidelines for Responsible AI Use in Federal Tax Practice." It is the first time the OPR has said anything specific about AI, and if your firm uses these tools on tax work, it is worth ten minutes of your attention.

Here is the plain version, including the part that touches billing.

What it is, and what it is not

The guidance applies Circular 230, the existing rulebook for practice before the IRS, to how you use AI. It does not create new rules. It walks through six duties you already have and explains how AI intersects with each one: competence, client data, supervision, accuracy, and so on.

Two things it is not:

It is not new law. It is introductory guidance interpreting binding rules that were already there.
It is not a client-disclosure mandate. Neither the OPR nor the AICPA has imposed a standalone "tell clients you used AI" duty on accountants. Rules from the legal profession that do require that circulate in vendor content as if they apply to CPAs. They do not.

It also applies to federal tax practice only. Bookkeeping and client accounting services sit outside it.

The part about money

One of the six duties is section 10.27, which governs fees. The guidance says practitioners should disclose the AI activities performed and "fairly credit to the client's account any cost reductions." It warns that billing for manual time you did not actually spend, or double billing for a task AI assisted with, may run into the fee rules where there is a pattern or a material discrepancy.

Read carefully, this is not radical. It is the existing rule against unconscionable fees, pointed at a new situation.

Three months before the guidance landed, 28% of tax practitioners using AI said they planned to keep their hourly rates and simply keep the time they saved.Blue J / CPA.com, March 2026, n=1,000

That plan is the thing the guidance speaks to most directly. If AI cuts a task in half and you bill the client as though it took the old amount of time, and that becomes a pattern, you have a 10.27 problem.

Why this makes fixed-fee pricing look better

Here is the quiet implication. Section 10.27 exposure attaches most cleanly to hourly billing, because that is where "time not worked" is a measurable thing.

A firm on fixed fees or value pricing is billing for an outcome, not for hours. When AI makes the work faster, the firm keeps the margin, the client gets the same deliverable, and there is no gap between hours billed and hours worked to explain.

This lines up with what clients say they want anyway. Business owners rate an accountant as more valuable when saved time goes into strategy conversations, not when the invoice shrinks. The guidance and the market are pointing the same direction.

The related risk worth knowing

The same survey found that 90% of tax practitioners using AI use general-purpose consumer models. The OPR guidance explicitly warns against putting client data into "unsecured or public systems," and IRC section 7216 carries criminal penalties for improper disclosure of taxpayer information.

So the exposure is really two things stacked: how you bill for AI-assisted work, and what tool the work runs through in the first place.

What to put in place

None of this requires a compliance project. It requires three artifacts and a habit:

A short AI policy. Which tools are approved, for what kind of work, and what is off limits. One page.
A tool register. A list of every AI tool that touches client data and what data terms it operates under. This is where you catch the consumer-chatbot problem.
A verification log. A lightweight record that a human reviewed AI output before it went to a client or the IRS. Circular 230 puts supervision on the responsible practitioner, and this is how you show it happened.
A billing habit. Decide how your engagement letters describe AI-assisted work and how cost savings show up. If you are hourly, this is the moment to look hard at fixed fees for the work AI now accelerates.

Most small firms have none of the first three. Building them is a half-day, and it is the first thing we set up before any workflow, because everything else assumes it exists.

If you want help turning this into a working setup for your practice, see what we build for accounting firms or get a breakdown for your firm specifically. No call needed.

This is general information, not legal or compliance advice. Confirm how Circular 230 applies to your practice with your own counsel or your state board.

Common questions

Does Circular 230 now require accountants to disclose AI use to clients?

No. Neither the IRS nor the AICPA has created a standalone AI disclosure duty for accountants. The June 2026 OPR guidance interprets existing Circular 230 duties. It expects AI cost savings to be reflected in billing and warns against billing for time not worked, but it does not impose a blanket client-disclosure rule. Some legal-profession rules that do require disclosure circulate in accounting content as though they apply. They do not.

What does the guidance say about fees?

It applies Circular 230 section 10.27 to AI. Practitioners should disclose the AI activities performed and fairly credit the client's account for cost reductions. Billing for manual time that was not actually spent, or double billing for AI-assisted tasks, may violate the fee rules where there is a pattern or a material discrepancy.

Is this new law?

No. It is introductory guidance interpreting rules that already exist. It applies to federal tax practice only, not to bookkeeping or client accounting services. As of August 2026 there is no enforcement history, and commentators differ on how far the fee expectation reaches.