The IRS Is Running AI on Your Clients' Returns — Here's the 7-Step Workflow That Cuts Notice Response in Half

Here's what the IRS's AI does during return processing:

Income cross-referencing. The system compares what a taxpayer reported on their return against every W-2, 1099-INT, 1099-DIV, 1099-NEC, 1099-K, and third-party report the IRS received for that taxpayer. Discrepancies — even small ones — are flagged for review. What took IRS examiners days now happens in seconds.

Payment app income matching. The $600 1099-K threshold change (in effect for the 2025 tax year, reported on 2026 returns) means millions of taxpayers who received money through Venmo, PayPal, Cash App, and Zelle received 1099-Ks for the first time this filing season. Many of them — and some of their accountants — may have handled these inconsistently. The IRS's matching AI will find those inconsistencies.

Audit-target selection. The agency's AI flags statistically unusual returns — entries that deviate from historical patterns for a given income level, industry, or deduction type — and routes them for examiner review. The formal governance policy (IRS Internal Revenue Manual 10.24.1, February 2026) documents this use. A separate GAO audit report (GAO-26-107522, 2026) confirmed AI's role in audit selection.

Here's the context that makes this urgent for accounting firms: the IRS has simultaneously cut roughly 27% of its workforce — from approximately 102,000 employees in early 2025 to 74,000–75,000 today. The AI is flagging more returns. There are fewer humans to process the fallout. Processing delays are already appearing, and the National Taxpayer Advocate's 2026 Annual Report explicitly flagged "significant service challenges ahead."

More flags. Longer queues. More confused clients calling their accountant.

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What's Coming to Your Clients' Mailboxes

The specific notices that AI income-matching generates:

CP2000 — The most common AI-generated notice. Proposes changes to a return when the IRS's records of income differ from what the taxpayer reported. Almost all 1099-K mismatches, unreported freelance income, and investment account discrepancies generate CP2000s.

CP14 — Balance due. Sent when the IRS calculates that additional tax is owed after matching. Often follows a CP2000 if the taxpayer doesn't respond or the resolution results in additional liability.

CP504 — Intent to levy. Sent when a balance due remains unresolved. Creates urgency and requires immediate action.

Letter 12C — Additional information requested. The IRS needs documentation to complete processing — most commonly for deductions, credits, or income items that were flagged but need supporting evidence before a determination is made.

CP5071C — Identity verification. Triggered when the AI detects patterns that suggest possible identity fraud or an anomalous filing pattern.

The volume of these notices has historically tracked IRS enforcement capacity. With AI running the matching and flagging — and fewer humans to slow the output — the volume this year will be higher, not lower.

For accounting firms: the clients who've been managing their own IRS correspondence — the ones who call you only when things escalate — are the ones most likely to be overwhelmed by this year's notice volume. They are the inbound demand signal.

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The 7-Step AI Workflow That Cuts Resolution Time from 35 to 14 Days

CPA Pilot published a detailed workflow analysis showing how AI handles IRS notice response across seven steps. The documented results: firms handling 30 notices monthly save approximately 22.5 hours per month (45 minutes per notice), and average resolution time drops from 35 days to 14.

Here's how the workflow operates:

Step 1: Triage and Auto-Classification

When a notice arrives, AI classifies it automatically: notice type (CP2000, CP14, CP504, Letter 12C, CP5071C), tax year, issue type, and response deadline. The triage step determines which response template and exhibit protocol to use, and assigns a priority level based on the notice type and deadline.

What this replaces: A CPA or admin manually reading the notice, determining what it requires, figuring out the response deadline, and routing it to the right person. At 5–10 minutes per notice for 30 notices, that's 2.5–5 hours of routing work per month.

Step 2: Research

For most notice types, the IRS is citing a specific code section, regulation, or discrepancy type. AI research tools pull the relevant tax code provisions, Treasury regulations, IRS guidance, and any applicable precedent for the issue type flagged. The research output gives the responding CPA the relevant framework before they've read the first source document.

What this replaces: 20–40 minutes of manual research per notice — longer for unfamiliar notice types or novel issues.

Step 3: Draft Response Letter

Using the notice classification, the tax year, the client's filing data, and the research output, AI generates a first-draft response letter in the format and tone the IRS expects. The draft includes the relevant code citations, the specific factual basis for the response, and the requested action (accept, modify, no change).

What this replaces: The most time-intensive writing step in the notice response workflow. For a standard CP2000 response, writing from scratch typically takes 60–90 minutes. AI gets you to a 90%-complete draft in minutes.

Step 4: Exhibit Building

AI organizes the supporting documentation — W-2s, 1099s, bank statements, receipts, prior-year returns — into the exhibit format the IRS expects for the specific notice type. Documents are labeled, sequenced, and cross-referenced to the response letter.

What this replaces: Manual document gathering and organization, which is often the step that creates the most delay and error risk in the notice response workflow.

Step 5: Human Fact Confirmation — The Non-Negotiable Gate

This is the only step that doesn't accelerate. The CPA reviews the AI draft, verifies every factual claim against the actual client records, corrects anything the AI got wrong or missed, and applies professional judgment to anything that requires interpretation.

This step cannot be abbreviated. The AI drafts; the CPA verifies. The liability is yours, not the software's.

The efficiency gain here is upstream: because the AI did the research, drafted the letter, and organized the exhibits, the CPA is reviewing a near-complete package rather than building from scratch. The review takes 15–30 minutes instead of 90–120.

Step 6: Client Communication in Plain English

After the response is finalized, AI drafts the client update: what the IRS said, what your firm responded, what happens next, and what — if anything — the client needs to do. Written in plain English, not tax language.

What this replaces: Time spent translating the IRS notice and your firm's response into something a non-accountant can understand. A task that's often skipped when firms are busy — to the detriment of client relationships.

Step 7: Case Tracking Until Resolution

AI tracks the open case through the IRS's response cycle: when the response was sent, what the IRS acknowledged, when a determination is expected, and when to follow up. Cases that go past their expected response window are flagged automatically.

What this replaces: Manual case tracking on a spreadsheet or in the firm's project management system — a step that frequently falls through the cracks during busy periods.

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What This Looks Like for a Typical Accounting Firm

At 30 notices per month (a reasonable baseline for a 10-person firm with active tax practice), the math is straightforward:

• Time saved per notice: ~45 minutes
• Monthly time recovery: ~22.5 hours
• Annual time recovery: ~270 hours
• Value at $200/hour: ~$54,000 in recovered staff capacity annually

The 14-day average resolution time (vs. 35-day baseline) also matters for client relationships. An IRS notice that lingers for five weeks breeds anxiety and erodes trust. A notice resolved in two weeks demonstrates that your firm has the workflow to handle these efficiently.

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The Representation Opportunity Your Firm Should Consider

Most small accounting firms handle IRS notices reactively — when a client calls. The structural shift underway creates an opportunity to get ahead of it.

With the IRS's AI generating more flags and the agency's human workforce reduced, clients who've been managing their own IRS correspondence — the small business owners, freelancers, and self-employed professionals who receive a notice and spend weeks trying to figure out what it means — are the most likely to need professional help this year.

Three services that become more valuable in a depleted-IRS environment:

Penalty abatement. The IRS's AI can generate notices; the humans who approve penalty relief are fewer. Knowing the process — first-time abatement, reasonable cause, administrative waiver — is a differentiator when clients are facing penalties.

Audit reconsideration. For clients who received an assessment and didn't respond effectively the first time, audit reconsideration is the formal mechanism to reopen the case. Understanding the workflow puts you in front of clients who tried to handle this themselves and failed.

Power of Attorney and transcript access. Before you can respond to any notice effectively, you need IRS transcript data. Clients who come to you mid-notice process often don't have the documentation the IRS expects. Being the firm that can pull transcripts, identify what the IRS has, and respond systematically is a competency worth building before the notice volume peaks — which is typically May through July for the prior-year filing season.

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Your Next Client Conversation

The proactive version of this doesn't require a new service, a new system, or a new team member. It's two sentences:

"The IRS lost a quarter of its workforce this year, and it's using AI to flag returns it doesn't have enough examiners to resolve quickly. If you get a notice this year — any notice — call me before you respond."

That's it. The clients who hear that from you are less likely to spend three weeks responding to a CP2000 on their own, making the situation worse. The clients who don't hear it from anyone are the ones who call you in month five of an escalated situation.

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What to Do This Week

For accounting firms handling any volume of IRS notices:

1. Look up CPA Pilot's published workflow breakdown (cpapilot.com) and review the seven-step structure against your current process. Identify which steps you're doing manually that AI could accelerate.

2. Build a standard exhibit protocol for your three most common notice types (CP2000, CP14, Letter 12C). Document the format the IRS expects and create a checklist for what client documents need to be gathered at each step. This one-time investment pays off every time a notice of that type arrives.

3. Draft the two-sentence proactive client message. Send it to your 10 most likely candidates — small business owners, freelancers, anyone who received their first 1099-K this year. You're not selling them anything. You're telling them to call you before something escalates.

The notice volume that follows a filing season with AI-generated flagging at scale will materialize over the next 90 days. The firms that have a workflow ready will handle it efficiently. The ones that don't will handle it slowly, expensively, and reactively.

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Related Reading

• How Accounting Firms Are Growing Revenue Without Growing Headcount
• The 3-Step AI Framework for Accounting Firm Client Advisory Services
• AI Capacity Multiplier: How Small Accounting Firms Are Growing Without Hiring
• Accounting Firms Replacing New Hires With AI: The Math Behind the Decision

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