For nearly two years, tens of thousands of IRS high-income nonfiler cases were effectively frozen after the agency sent an initial notice but failed to move the cases through its normal enforcement process. That pause is now over.

According to a new audit from the Treasury Inspector General for Tax Administration, or TIGTA, the IRS advanced 38,824 high-priority nonfiler cases after discovering that they had remained stalled in first-notice status. Those cases involved 33,653 taxpayers and approximately $15.7 billion in potential tax assessments.

The IRS moved the affected cases forward in March 2026. That means taxpayers whose cases had been delayed may now receive final notices or see their accounts routed into more serious IRS compliance and enforcement programs.

If you have one or more unfiled tax returns—especially if third-party records show substantial income—this development should not be ignored. A long period of silence from the IRS does not mean the problem has gone away. It may simply mean the agency has not yet moved your case to its next stage.

Here is what the TIGTA audit found, what the IRS may do next, and how taxpayers can act before the government prepares a tax return for them.

Why Did the IRS Target These Nonfiler Cases?

The IRS launched its high-income nonfiler initiative in February 2024. The initiative initially monitored 135,270 cases involving people who had not filed one or more required individual income tax returns.

Most of the cases involved individuals whose income, based on Forms W-2, 1099 and other third-party information reported to the IRS, appeared to be at least $400,000. The initiative primarily covered tax years 2017 through 2021.

The population also included smaller groups of:

  • Federal employees and retirees with unfiled returns;
  • IRS employees with unfiled returns; and
  • Certain taxpayers identified following a Senate Finance Committee request, including people with multiple missing returns and substantial balances.

The IRS began the initiative by sending CP59 notices. A CP59 tells a taxpayer that the IRS has no record of receiving a required personal tax return. It asks the recipient to file the return, explain why no return was required, or provide information showing that the return was already filed.

Under the IRS’s normal return-delinquency process, a taxpayer who does not respond to the first notice may receive a CP518 final notice approximately eight weeks later. From there, the case can move into another compliance or enforcement stream.

That progression did not happen for thousands of these cases.

How Nearly 39,000 IRS Nonfiler Cases Became Stuck

In March 2024, IRS collection management asked for final notices to be delayed because of concerns about whether the agency had enough resources to work the cases that would result. Information Technology pauses were placed on the affected accounts.

IRS officials noticed in July 2024 that some cases were not progressing as expected, but they did not initially know what was causing the delay. TIGTA later determined that the original pauses had remained in place.

As of June 30, 2025, 38,824 high-priority cases involving 33,653 taxpayers were still sitting in first-notice status. Most of those taxpayers had received their initial notices in February or March 2024 but had received no follow-up notice and had not been moved into another compliance program.

After TIGTA raised the issue, the IRS identified the affected accounts and advanced them to the next appropriate status in March 2026.

This does not mean that all 38,824 cases were immediately assigned to revenue officers or that every taxpayer is about to face a levy. It means the cases are no longer protected by the administrative hold that prevented them from moving through the system.

For affected taxpayers, the next step could include a final nonfiler notice, an IRS-prepared substitute return, an automated collection assignment, a field collection assignment or another enforcement treatment.

What Does the $15.7 Billion Figure Really Mean?

The nearly 39,000 stalled cases were associated with approximately $15.7 billion in potential tax assessments. That is an eye-catching number, but it must be understood correctly.

It is not $15.7 billion that the IRS has already assessed, billed or collected. It is an estimate of the tax that might be assessed if the IRS prepared substitute returns using the income information available to the agency.

Those calculations generally rely on wages, investment income, business payments and other amounts reported by third parties. They may not include every deduction, business expense, credit, loss, exemption or cost-basis adjustment that the taxpayer could claim on an accurately prepared return. Therefore, the final liability could be higher or lower.

TIGTA also developed a more conservative estimate based on the results of the broader initiative. As of June 30, 2025, the IRS had secured a return or made an assessment in approximately 27% of the cases reviewed. Applying that rate to the stalled inventory, TIGTA estimated that releasing the cases could produce returns or assessments in 10,482 cases and approximately $321.3 million in additional tax due.

The distinction matters: $15.7 billion describes the theoretical potential assessment attached to the entire stalled inventory. The $321.3 million figure is TIGTA’s estimate of the additional tax likely to result from returns or assessments in a portion of those cases.

What Is an IRS Substitute for Return?

When someone repeatedly fails to file, the IRS may prepare what is commonly called a Substitute for Return, or SFR. The authority for this process generally comes from Internal Revenue Code Section 6020(b).

The IRS uses income information it already possesses to calculate a proposed tax liability. This may include information from employers, banks, brokerage firms, payment processors, retirement plans and businesses that issued Forms 1099.

The problem is that the IRS is working with an incomplete picture. A substitute return may not give the taxpayer the full benefit of legitimate:

  • Business expenses;
  • Itemized deductions;
  • Tax credits;
  • Dependents;
  • Investment basis;
  • Losses or carryforwards; or
  • Other elections and adjustments.

An IRS-prepared return is not designed to produce the most favorable lawful result for the taxpayer. It is designed to create an assessment using the information available to the government.

The IRS may send a CP2566 notice showing a proposed calculation. It may later issue a CP3219N Notice of Deficiency, sometimes called a 90-day letter. A taxpayer who receives a CP3219N generally has 90 days to file the missing return or petition the United States Tax Court. That is a critical deadline and should not be ignored.

If the taxpayer does nothing, the IRS can assess the proposed balance. An unpaid assessment can then move into the collection process, which may eventually involve a federal tax lien, bank levy or wage garnishment.

Even after the IRS prepares a substitute return, filing an accurate original return may still be beneficial. The IRS generally adjusts the account when it accepts a properly prepared return showing the correct income, deductions, credits and tax.

Have multiple unfiled returns, more than $50,000 in potential tax debt or an active IRS audit? IRS Trouble Solvers can review your notices and transcripts, identify where your case stands and help you build a strategy before enforcement escalates. Call (630) 832-6500 to request a risk-free case evaluation.

Another 10,969 Cases Were Waiting in the Collection Queue

TIGTA found a second group of high-priority cases that had already passed through the notice process but remained in the IRS collection queue.

As of June 30, 2025, the queue contained 10,969 cases involving 8,853 taxpayers. Those cases represented approximately $2.5 billion in potential tax assessments. By December 31, 2025, the IRS had reduced the queue to 9,463 cases.

Being in the collection queue does not guarantee that a case will immediately be assigned to a revenue officer. TIGTA acknowledged that staffing and resource constraints could prevent some cases from receiving prompt field assignments. Nevertheless, the watchdog recommended that the IRS evaluate other treatments, including routing appropriate cases to automated substitute-return programs.

TIGTA estimated that prioritizing the original 10,969 queued cases could result in returns or assessments in approximately 2,962 cases and about $90.8 million in additional tax due.

The practical lesson is simple: IRS staffing shortages may affect how quickly a case moves, but taxpayers should not assume that a shortage makes an unfiled return safe. Automated notices and substitute-return programs can continue moving a case forward even when no individual revenue officer has been assigned.

What If You Already Filed the Return?

The audit uncovered another serious problem: the IRS sent first notices in 4,918 cases involving 4,748 taxpayers who had already filed their returns.

For many of these taxpayers, the IRS had received the return but had not yet processed or posted it to the taxpayer’s account. Sixty-seven percent of the affected returns had been filed on paper. Other returns experienced delays because of identity-theft indicators, missing information or other processing issues.

This is why an IRS notice should be verified rather than automatically accepted or ignored.

If you receive a CP59 or another notice for a return you believe was filed:

  1. Locate your complete copy of the signed return.
  2. Gather proof of mailing, certified-mail tracking or electronic acceptance.
  3. Review your IRS account transcript to determine whether the return posted.
  4. Follow the response instructions and deadline printed on the notice.
  5. Keep copies of everything you send to the IRS.

Sending another copy without understanding the account can sometimes create additional processing problems. A qualified tax professional can review the transcripts and determine whether the return is missing, delayed, rejected or posted incorrectly.

What Should You Do If You Have Unfiled Tax Returns?

Do not wait for the next notice to arrive. Taking action before the IRS completes a substitute return or makes an assessment usually gives you more control over the process.

1. Identify every missing return

Create an accurate list of the federal and state returns you have not filed. Do not rely exclusively on memory. IRS account transcripts can help identify which years the agency currently shows as missing.

2. Obtain wage-and-income records

Wage-and-income transcripts can show Forms W-2, 1099, 1098, K-1 and other information reported under your Social Security number. These transcripts can be essential when original records are missing.

However, transcripts may not contain all the details needed to prepare an accurate return. Business owners, investors and self-employed taxpayers may need bank statements, bookkeeping records, brokerage statements, cost-basis information and expense documentation.

3. Determine where the case is in the process

A CP59 is not the same as a CP518, CP2566 or CP3219N. The appropriate response depends on the notice, the tax year and whether the IRS has already proposed or made an assessment.

If a revenue officer has contacted you, the matter has reached a more serious stage. Read our guide on what it means when an IRS revenue officer is assigned.

4. Prepare accurate returns before discussing resolution

Filing compliance is generally required before the IRS will approve many collection alternatives. The returns should also be accurate. Filing hurried or incomplete returns simply to check a box can create new problems.

For more information about older missing returns, see how many years you may need to file when you owe the IRS.

5. Address the balance strategically

Filing and paying are separate issues. You should generally file required returns even if you cannot pay the entire balance immediately.

Depending on the facts, potential resolution options may include:

  • An installment agreement;
  • A partial-pay installment agreement;
  • Currently Not Collectible status;
  • An Offer in Compromise;
  • Penalty relief;
  • An audit reconsideration or appeal; or
  • A challenge to an incorrect assessment.

Eligibility is highly fact-specific. The right solution depends on income, allowable expenses, assets, equity, the age of the liability, prior compliance and the accuracy of the IRS’s assessment.

Why Waiting for the IRS Can Cost You

People often postpone filing because they are afraid they cannot pay. Unfortunately, failing to file usually makes the situation harder—not easier.

Waiting may lead to additional penalties and interest, lost refunds, delayed loan approvals, frozen refunds from later years and an IRS-prepared return that overlooks favorable information. Once a balance is assessed, the case can progress toward liens and levies if it is not resolved.

There is also an important timing issue. The IRS generally has ten years to collect an assessed tax, subject to events that can suspend or extend the period. But when a required return has never been filed, the normal assessment limitation period generally does not begin in the same way it would after a valid return is filed. Silence is not the same as expiration.

If you are already receiving collection notices, review our guidance on what to do when you receive an IRS notice and how to respond to a Notice of Intent to Levy.

The Bottom Line: The IRS Nonfiler Pause Is Over

The IRS did not forgive or close nearly 39,000 high-priority nonfiler cases. A processing hold prevented those cases from moving forward for roughly two years. In March 2026, the IRS released the affected accounts so they could continue through the notice and enforcement process.

Not every taxpayer with an unfiled return was included in this specific initiative. However, the audit sends a broader warning: a case can remain quiet for months or years and then begin moving again. The IRS continues to receive income information from third parties, and it can use automated systems to calculate and assess tax when a taxpayer does not file.

If you have significant income, multiple unfiled returns, an IRS nonfiler notice or a proposed substitute return, now is the time to understand your exposure and develop a strategy. Acting before the IRS completes the process can help preserve deductions, credits, appeal rights and resolution options.

Frequently Asked Questions About IRS High-Income Nonfiler Cases

Did the IRS forgive the nearly 39,000 nonfiler cases?

No. The cases were stalled in first-notice status because a processing hold remained in place. The IRS advanced the affected cases in March 2026 so they could continue through the appropriate notice or enforcement process.

Who was included in the IRS high-income nonfiler initiative?

Most cases involved individuals with at least $400,000 in income reported to the IRS by third parties for tax years 2017 through 2021. The initiative also included certain federal employees, IRS employees and taxpayers identified through a Senate Finance Committee request.

What happens after an IRS CP59 notice?

A CP59 asks a taxpayer to file a missing return or explain why no return is required. If the taxpayer does not respond, the IRS may issue a final nonfiler notice and route the case to another compliance program, including the Substitute for Return process or collection.

Can the IRS file a tax return for me?

Yes. If a required return remains unfiled, the IRS may prepare a Substitute for Return using income information reported by third parties. That calculation may not include all the deductions, credits, expenses or cost basis the taxpayer could claim on an accurately prepared return.

What if I already filed the return mentioned in the notice?

Do not ignore the notice. Locate the filed return and proof of mailing or electronic acceptance, review the applicable IRS transcript and respond using the instructions on the notice. A tax professional can help determine whether the return was delayed, rejected, misapplied or never received.

Should I file if I cannot afford to pay the tax?

Generally, yes. Filing and paying are separate issues. Filing the required returns establishes the correct liability and may be necessary before the IRS will approve an installment agreement, Currently Not Collectible status, Offer in Compromise or another collection alternative.

Get Help With Unfiled Returns and IRS Enforcement

IRS Trouble Solvers has helped individuals and businesses resolve serious federal and state tax problems since 1991. Our team includes enrolled agents, tax attorneys and other experienced tax-resolution professionals who understand unfiled returns, substitute assessments, audits and IRS collection procedures.

We can help determine which returns are missing, obtain and review IRS transcripts, prepare a compliance strategy, address incorrect assessments and evaluate the resolution options available based on your circumstances.

If you owe more than $50,000, are under IRS audit or are facing significant enforcement activity, do not wait for the next notice to determine what happens.

Call IRS Trouble Solvers at (630) 832-6500 or schedule a risk-free case evaluation today.

This article provides general educational information and is not legal or tax advice. Tax outcomes and available resolution options depend on each taxpayer’s individual facts and circumstances.

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