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In 2019, a California real estate sale produced a capital gain that was never reported correctly on the federal return. The IRS Automated Underreporter program matched that sale against the filed return, issued a CP2000, and the account eventually carried about $566,000 in federal tax, penalties, and interest. While that federal balance grew, California Franchise Tax Board collection ran in parallel.
We rebuilt the return, filed the correction, and asked the IRS to reconsider the assessment. The federal balance went to $0, California went to $0 as well, and the Franchise Tax Board authorized a refund. This post walks through what a CP2000 is, what went wrong on the original return, what we filed, and how both the IRS and California outcomes landed. The client came to us in March 2025; California cleared that October, and the federal assessment reversed about eighteen months after intake.
What a CP2000 actually is
A CP2000 comes out of the IRS Automated Underreporter (AUR) function, which matches third-party reports to what you put on your return. Form 1099-S closing and sale reporting from a real estate transaction is a classic trigger. When the match fails, AUR can propose more income and more tax. Topic 652 on IRS.gov is plain about it: the notice is a proposal first, and if you ignore it long enough it becomes an assessment you have to live with.
Before a proposed deficiency is assessed, the IRS generally issues a statutory notice of deficiency (CP3219A). That notice gives the taxpayer 90 days to petition the United States Tax Court. Missing that window is how a disputed AUR proposal hardens into an assessed balance.
In this file, the Form 1099-S sale data and the return did not line up. The gain from the 2019 California property sale was not properly reported, and that gap drove the underreporter notice while interest and penalties kept stacking until the federal accrued figure sat at about $566,000.
People often reach for IRC section 121, the primary-residence exclusion, after a home sale. It is real, it has ownership and use tests, and it has dollar caps, but it is also one of the most misunderstood pieces of the Code in this setting. The corrected return reported the 2019 sale with stepped-up basis from the inherited California property and the selling costs shown in the closing file, so the additional tax from the AUR match came out to $0. That is what the later TC 291 reduction reflected. The winning path was that corrected filing plus audit reconsideration, not a slogan about exclusions.
What went wrong on the original return
Capital gain from the sale needed to land on the federal return with the right basis, expenses, and character. When it does not, AUR fills the gap with what the settlement documents and Form 1099-S report, and that proposed tax becomes real once the IRS assesses it.
Collection does not wait for the file to get organized. Federal notices kept coming, California FTB carried its own balance, and installment agreement payments and fees on the state side added to the squeeze. Passport pressure showed up later on the federal side once the debt crossed the seriously delinquent threshold. That pathway is public. For 2026, IRS.gov puts the seriously delinquent passport certification threshold at more than $66,000 of unpaid, legally enforceable federal tax, including penalties and interest. That dollar amount is adjusted each year for inflation, and the certification in this case was under the threshold in effect at the time the IRS certified the debt.
What CLAW Tax Group did
I am a tax attorney and CPA. We started the way we start hard collection files: closing statements, prior returns, notices, and account transcripts, because you cannot reverse a six-figure AUR assessment without the documents that support the corrected numbers.
We filed Form 2848 so we could represent the client before the IRS. Form 2848 is the IRS power of attorney. It lets an eligible representative receive confidential tax information and act on the matters you authorize. Without it, you are stuck translating notices alone while interest runs.
Then we prepared and filed an amended return on Form 1040-X for the year at issue. Form 1040-X is how you correct a previously filed individual return, or change amounts the IRS already adjusted. The goal was a return that matched the real sale and the supporting records, including the Form 1099-S and closing file that AUR had used in isolation.
We also pursued audit reconsideration, which is the IRS process for asking the Service to reevaluate an assessment when you disagree with the findings and the liability remains unpaid, or when you have new information that was not considered before. IRS.gov describes the correspondence path. New support matters, and the unpaid assessment path matters. If you already paid in full, the refund route usually goes through Form 1040-X instead, as long as the refund statute of limitations is still open.
Collection Due Process and Appeals work ran in parallel. A timely CDP request can put levy action on hold for the periods under appeal while Appeals looks at the case. We coordinated so the hearing could be suspended pending the exam work and moved on an expedited track, because you do not want Appeals and Exam talking past each other while a levy clock keeps ticking. Our Collection Due Process page covers the hearing request at a high level if you are staring at a levy notice right now.
California work moved at the same time. State and federal balances often feed each other, and fixing one side while ignoring the other leaves collection pressure on the table.
California outcome
On the FTB side, the Tax Year Summary for 2019 showed a Tax Year Balance of $0.00. The amended return for that year was filed on September 15, 2025. A refund of $8,464 was authorized on October 8, 2025. That refund reflected the installment agreement payments the client had already made on the state balance once FTB eliminated the liability.
That is a clean state year: balance to zero and a refund authorized. The parallel California work was part of getting the client out of dual collection.
IRS outcome
Federal transcripts reviewed on September 28, 2026 told the rest of the story. The 2019 assessed and accrued balance was $0 on the same year that had carried about $566,000 accrued.
A TC 291 posted for about −$289,774. Interest and penalty reversals followed the tax adjustment. The IRS issued a CP21 notice on October 5, 2026 reflecting the account change. On October 12, 2026, the seriously delinquent passport certification was reversed.
This is one case. We do not reverse every CP2000, and we do not promise same-day miracles. Facts, documents, and timing decide what the IRS and FTB will do.
If you are sitting on a CP2000 or a big unreported sale
Do not ignore the notice. AUR proposals become assessments, assessments become collection, and collection becomes levies, liens, and in large-balance cases passport certification.
Start with the return that should have been filed correctly in the first place. Pull the closing file, the Form 1099-S, the basis work, and every notice. If you need someone who can speak to the IRS for you, that usually means Form 2848 and an eligible representative.
If collection is already loud, map the pressure points: levy risk, state parallel balances, and passport certification if the federal debt is large enough. Our tax relief services overview and IRS levy page are starting points. For audit-side fights, see audit defense.
When you want a straight read on your facts, contact us for a consultation and get a real look at the file before you guess your way through a six-figure notice.
I am Matthew Wildes, JD, CPA, tax attorney and partner at CLAW Tax Group. We represent clients nationwide. We cannot promise any result, but we can rebuild the file, file the amended return, and put a real reconsideration package in front of the IRS.
