The Tax Times: Billions at Stake: TIGTA Says IRS Has Information Re Top FATCA Non-Filers But Failed To Provide Adequate Enforcement

TIGTA Calls Out IRS Inaction on Highest‑Balance FATCA Nonfilers

On April 8, 2026, the Treasury Inspector General for Tax Administration (TIGTA) released a new audit report titled, “The IRS Has Not Successfully Addressed the Highest Balance Foreign Account Tax Compliance Act Nonfilers” (Report No. 2026‑308‑009). The report continues a theme TIGTA has raised for years: the IRS is sitting on a massive trove of FATCA data about U.S. taxpayers with significant offshore accounts, but has not effectively used that data to pursue nonfilers of Form 8938 and related income tax obligations.

Background: FATCA Data vs. IRS Follow‑Through

FATCA requires foreign financial institutions to report information about accounts held by U.S. persons, which flows to the IRS primarily on Form 8966. U.S. taxpayers with foreign financial assets above certain thresholds must disclose those assets annually on Form 8938, Statement of Specified Foreign Financial Assets. In theory, this creates a closed loop: foreign banks report the accounts, and U.S. taxpayers report the same accounts on their returns, giving the IRS a powerful tool to detect offshore noncompliance.

In practice, TIGTA has repeatedly found that the loop is not closing. A 2022 TIGTA report, for example, identified hundreds of thousands of apparent Form 8938 nonfilers with foreign accounts above 50,000, and estimated at least 3.3 billion in potential FATCA penalties that had not been assessed. The 2026 report zeroes in on an even more troubling subset of that universe: the highest‑balance nonfilers.

What TIGTA Means by “Highest‑Balance Nonfilers”

Although the 2026 report’s detailed figures were not yet widely disseminated at the time of writing, TIGTA’s prior FATCA work makes clear what is at stake. Using Form 8966 data from foreign institutions, the IRS can identify U.S. account holders with:

· Large offshore balances over the relevant FATCA thresholds, and

· No corresponding Form 8938 filing and, in some cases, no U.S. income tax return at all for the same period.

These “highest‑balance nonfilers” are precisely the taxpayers who pose the greatest risk of significant unreported income and unpaid U.S. tax, and who also face the largest potential civil penalties. FATCA penalties start at 10,000 for failure to file Form 8938 and can increase by up to 50,000 for continued noncompliance after IRS notice, in addition to accuracy‑related penalties and, where warranted, more serious civil or criminal consequences.

TIGTA’s Core Criticism: IRS Has the Data, But Not the Results

In this new report, TIGTA essentially repeats and sharpens the criticism from 2022: the IRS has not successfully converted FATCA data on the highest‑risk accounts into concrete enforcement outcomes. Prior TIGTA findings—highly consistent with the new report’s title—have highlighted:

· Limited use of FATCA data analytics to systematically identify and prioritize high‑balance nonfilers for examination.

· Significant data‑matching problems caused by missing or invalid taxpayer identification numbers and incomplete account‑holder information reported by foreign institutions.

· A large and persistent gap between the theoretical FATCA penalty exposure and the relatively small number of cases in which the IRS has actually proposed or assessed those penalties.

The message from TIGTA is not that the IRS lacks information. It is that the Service has not yet built the internal processes, technology, and staffing to fully exploit that information, especially at the top end of the risk spectrum. The campaign identified 405 taxpayers with significant foreign account balances who appeared to be noncompliant with their FATCA reporting requirements.

The IRS used two methods to address the 405 noncompliant taxpayers: referral for examinations and letter issuance.

164 taxpayers (who had an average unreported foreign account balance of $1.3 billion) were referred for possible examination. However, only 12 of the 164 were examined, with five having $39.7 million in additional tax and $80,000 in penalties assessed.
241 noncompliant taxpayers (who had an average unreported account balance of $377 million) were sent a combination of 225 educational letters (requiring no response from the taxpayers) and 16 soft letters (requiring taxpayers to respond). None of the 241 taxpayers were assessed the initial $10,000 FATCA nonfiling penalty.

Campaign 896 Activity and Results

FATCA

Why This Matters for High‑Balance Offshore Clients

For U.S. taxpayers with significant foreign accounts, the 2026 TICTA report is another warning shot. Even if the IRS has been slow to act on FATCA data in the past, TIGTA’s continued focus and public criticism increase the pressure on the Service to show results, particularly against high‑balance nonfilers.

This has several practical implications:

· Discovery risk is rising, not falling. As the IRS improves its data‑matching tools and responds to TIGTA’s recommendations, the probability that a high‑balance nonfiler is identified years after the fact continues to grow.

· Penalties can be severe once a case is selected. FATCA penalties for Form 8938 nonfilers are layered on top of FBAR penalties, accuracy‑related penalties, and interest, and TIGTA has explicitly quantified the billions of dollars of potential assessments still on the table.

· Prior “quiet” noncompliance is not a long‑term strategy. The more data flows through FATCA and related automatic exchange of information systems, the less realistic it is to assume that offshore noncompliance will remain undetected indefinitely.

A Better Approach: Proactive Offshore Compliance

For taxpayers who have not fully complied with Form 8938, FBAR, or related foreign information reporting, the safest path remains proactive remediation rather than waiting to see whether the IRS acts on TIGTA’s latest report. Practically, this may involve:

· Conducting a thorough review of all foreign accounts and assets to determine the years and forms affected (Form 8938, FBAR, Forms 3520/3520‑A, 5471, 8621, etc.).

· Exploring available compliance options—such as amended returns, delinquent information return submissions, or, where appropriate, voluntary disclosure pathways—based on the taxpayer’s facts and risk profile.

· Documenting reasonable cause where supportable, particularly for clients who had legitimate confusion about overlapping FATCA and FBAR rules but are now prepared to bring their filings current.

TIGTA’s 2026 message is clear: the IRS has had, for years, detailed information about U.S. persons with large offshore accounts and missing FATCA filings, and it has not yet delivered the enforcement results Congress expected. For high‑balance taxpayers who remain noncompliant, this is not a reassurance—it is a sign that they are squarely in TIGTA’s spotlight, and sooner or later, they are likely to be in the IRS’s as well.