When a client forwards an IRS CP2000 notice — the 24-hour playbook

The CP2000 notice — the IRS's "underreporter" letter — is the most common substantive piece of IRS mail an individual taxpayer will receive. The IRS sends roughly 4 million CP2000s a year, mostly triggered by unreported 1099 income, K-1 mismatches, or brokerage transactions the taxpayer forgot existed.

For the client, the notice triggers a small panic spike. For the CPA, it's a service-quality moment that the client will remember for years. This article is the operational playbook for handling the forwarded CP2000 inside 24 hours, without giving premature advice, and without burning hours on a notice that often resolves with a single response letter.

What clients actually need in the first hour

When the client forwards the notice, three feelings are running simultaneously in their head:

1. "How bad is this?" — they want a calibrated sense of severity.
2. "How much will this cost me?" — they want a calibrated sense of liability.
3. "What do I do?" — they want a clear next step.

A good first response addresses all three within 60 minutes. It does not attempt to resolve the notice. That comes later, with a full review.

The first reply template:

Hi [client],

Got the CP2000. Thanks for forwarding it quickly — the response window matters with these.

Quick orientation: CP2000 notices are very common. The IRS is flagging a mismatch between what they have on file (usually from 1099s or W-2s reported by third parties) and what was reported on your return. Most CP2000s either resolve with a single response letter or end up requiring a small payment + interest — they are usually not the start of an audit.

Action plan from my side:

• Today: I'll pull your 2023 return and the underlying documents we have, and compare line by line against the discrepancies they flagged on page 2 of the notice.
• Tomorrow: I'll have a clear read on whether their numbers or our return is correct, and what the response should be.
• I'll have a draft response (or, if simpler, an agreement form) for your review by [day after tomorrow].

One thing I'll need: do you have any income documents from 2023 that we didn't include in the original return — a side 1099, brokerage statement, K-1 from a partnership? If yes, send them when you can. If you're not sure, no problem — I'll figure it out from the IRS file.

Response deadline is [date from page 1 of notice]. We're well within the window.

Talk soon, [Your name]

The structure does four things in 200 words:

• Reduces panic by normalizing the notice and explaining what it usually is.
• Sets a 48-hour action timeline so the client knows when to expect substance.
• Asks one specific question that, if answered, accelerates the review.
• Confirms the response window so the client knows there's time.

Notice what the reply does not do: it doesn't quote a number, doesn't speculate on whether the IRS is right, and doesn't characterize the matter beyond "common." All substantive work waits for the full review.

The 24-hour internal review

Inside 24 hours of receiving the forwarded notice, do this review yourself:

1. Pull the original return for the notice year. Open it next to the CP2000.
2. Find the discrepancy list on page 2 (sometimes 3) of the notice. Each row is an income item the IRS thinks was unreported, with the payer name, document type (1099-MISC, NEC, INT, B), and amount.
3. For each row, locate the underlying income document in your file and compare against what's on the return.

You'll end up in one of three buckets:

The notice is wrong. Your return reported the income correctly; the IRS misread or duplicated. Response: a written disagreement with a copy of the relevant page of the return + the underlying document showing where it was reported. Usually a 30-minute letter.

The notice is partially right. Some flagged items are legitimate misses (a forgotten 1099, an under-reported brokerage gain); others are already on the return but mischaracterized by the IRS system. Response: agree with the legitimate items, dispute the rest, calculate the corrected tax. Usually a 1-2 hour engagement.

The notice is fully right. The flagged income was genuinely omitted. Response: agree, calculate the tax + interest, decide whether to use the IRS's Form 9465 installment request if the amount is meaningful. Usually a 30-minute engagement.

About 50% of CP2000s resolve in the first bucket, 30% in the second, 20% in the third. The math heavily favors a fast, structured review over a defensive posture.

The 48-hour client follow-up

The follow-up email — the substantive one — comes 24-48 hours after the first reply. It tells the client what you found, what the response will be, and what (if anything) it will cost.

Hi [client],

Finished the review on the CP2000. Here's where things land:

[Pick the version that matches what you found:]

Version A — Notice is wrong. Our 2023 return reported the [item] correctly on [Schedule X, Line Y]. The IRS appears to have miscategorized it. I've drafted the response letter with a copy of the relevant page + the underlying [1099/document]. No additional tax due. I'll send it certified mail this week and we should have written acknowledgment back from the IRS within 6-8 weeks.

Version B — Notice is partially right. Two of the four flagged items were legitimately missed: the [item 1] and [item 2]. The other two ([item 3] and [item 4]) were on the return but mischaracterized by the IRS system. Net additional tax: $[amount], plus $[amount] in interest from the original filing date. I've drafted the partial-agreement response. Best path: I'll send it this week, you'll get a final bill from the IRS, and the matter closes.

Version C — Notice is right. The flagged income was not on the original return — looks like [the 1099 / K-1] wasn't included in the document set we worked from. Net additional tax: $[amount], plus $[amount] interest. Options: pay in full now (cleanest, stops the interest), or set up an installment plan with Form 9465 if cash flow is tight. Let me know your preference and I'll prep the response accordingly.

No action from you needed yet — I'll handle the response. I'll keep you posted when I hear back from the IRS.

[Your name]

The follow-up does the substantive work the first reply deliberately deferred. Now you have the facts, the timeline, the dollar amount, and a clear next step.

What to bill for

CP2000 responses are billable, but the billing structure matters more than the rate. Three patterns:

Flat fee for the response letter. $400-$800 for a clean disagreement letter; $600-$1,200 for a partial-agreement; $300-$500 for a full-agreement response. Predictable, fast to scope, easy to communicate.

Hourly with a cap. If your typical rate is $250-$400/hour and you expect 2-3 hours, quote it as a not-to-exceed of $1,000-$1,500. Reassures the client there's a ceiling.

Inclusive in retainer (for ongoing-engagement clients). Some firms include up to one CP2000 response per year in an ongoing tax-prep engagement, charging extra only for audit-level work. Lower friction for the client; tends to reduce churn.

Whatever the structure, communicate the fee in the 48-hour follow-up, not the first response. The first response is about reducing panic, not pricing.

The mistakes that hurt the most

Three patterns to avoid:

Telling the client "I'll look at it when I have a chance." The CP2000 has a 30-day response window. Even if you genuinely have plenty of time, the client doesn't know that. Confirm the timeline in the first reply.

Speculating in the first reply about whether the IRS is right. "Looks like they might be wrong, but I'd need to verify" is worse than silence. It sets an expectation you may have to walk back. Defer the substantive read to the 48-hour follow-up.

Forgetting to send the response certified mail with return receipt. The IRS's record-keeping on CP2000 responses is uneven. Certified mail with return receipt is your only proof. Costs $5-$8 per letter. Worth every penny.

Closing the loop

When the IRS sends final confirmation (usually 6-12 weeks after your response), forward it to the client with a one-line note:

Hi [client] — the IRS closed out the CP2000 we responded to back in May. Final result: [no tax due / $X due, you should already have paid this / agreed to installment, first payment of $X is due on Y]. The notice is officially resolved. Forwarded below for your records.

Closing the loop is the part most CPAs forget. It's also the part the client remembers — proactive notification that the issue is resolved, weeks after they'd stopped thinking about it, is the single biggest contributor to "my CPA is amazing" word-of-mouth on this kind of work.

Handle one CP2000 well and the client tells two friends. Handle five well and you've built a pipeline of high-margin tax-controversy work that compounds for years.