It's the question behind half the "should I even bother filing?" threads: how would the IRS even know? You live abroad, you're paid abroad, your money is abroad. If you just don't file, who is going to notice?
The honest answer in 2026: more than you'd think, and the trend runs one way. Here is the actual machinery, without the scare tactics and without the false comfort.
How does the IRS find Americans who don't file?
One channel is foreign financial-account reporting. Under FATCA (the Foreign Account Tax Compliance Act), participating foreign financial institutions identify and report specified US accounts, either directly to the IRS or through a local tax authority under an intergovernmental agreement. A US birthplace, citizenship, or other indicia can prompt an institution to request documentation, but whether an account is reportable depends on the governing rules and account facts.
The IRS can receive foreign-account data even when a taxpayer does not file. Whether a particular account is reported depends on the institution, jurisdiction, account classification, thresholds, and documentation.
"But I have no US assets and I'm never going back."
This is the most common version of the bet, and the one Reddit most often endorses. It has three holes:
- The assessment period generally does not begin on a year with no return. A filed return normally starts a three-year assessment period, subject to statutory exceptions. Under IRC §6501(c)(3), tax can be assessed "at any time" when no return was filed. FBAR penalties work differently: there is a fixed six-year clock that runs whether or not the FBAR was ever filed.
- FATCA reporting doesn't require you to come back. The data crosses the border on its own.
- Later events can bring the filing history back into focus. An inheritance, US employment, property transaction, or other filing event can require earlier records to be examined.
What can actually happen if I owe and don't pay?
Tax owed depends on income, exclusions, credits, and filing facts. If a balance becomes seriously delinquent:
- Your passport. Federal law (IRC §7345) lets the IRS certify a "seriously delinquent tax debt" to the State Department, which can then deny or revoke your passport. That threshold is $66,000 in 2026, including penalties and interest and indexed yearly. For someone living abroad, a passport problem is not a minor inconvenience.
- Banking friction. FATCA has made some foreign banks reluctant to keep US-person clients; opening or renewing accounts can require US tax paperwork you do not have if you have never filed.
- Reporting-form penalties. FBAR and Form 8938 carry penalties that apply even when little or no tax is due.
What Reddit gets wrong
The advice, "no US assets, never going back, just don't file, they will never find you," ignores several legal and practical points:
- A foreign financial institution may report a US account under FATCA.
- The unfiled year never ages out (§6501(c)(3)).
- The Streamlined procedures are unavailable once there is an IRS civil examination or IRS Criminal Investigation of the taxpayer.
No primary source supports a prediction about whether or when the IRS will contact a particular taxpayer. The legal obligations and limitations periods exist independently of that prediction.
The asymmetry that should drive the decision
The availability and terms of a compliance procedure depend on the taxpayer's facts:
- For an eligible SFOP submission, a taxpayer must meet the program's non-residency and non-willfulness requirements and submit three years of returns and six years of FBARs. The SFOP terms provide a 0% offshore penalty and waive specified failure-to-file and failure-to-pay penalties. Tax and statutory interest remain due.
- Once there is an IRS civil examination or IRS Criminal Investigation, the taxpayer is not eligible to use the Streamlined procedures. That does not make statutory maximum penalties an assessment or a starting point; any penalty depends on the governing law and facts.
The relevant questions are which filing obligations exist, whether a compliance procedure is available, and what tax, interest, or penalty exposure the facts support.
What compliance options can be reviewed?
The Streamlined procedures are one possible route for taxpayers who satisfy their requirements. These resources explain the rules and alternatives:
- What the Streamlined program is
- Owe $0 abroad? You probably still have to file
- Already got a FATCA letter from your bank?
- Review the eligibility rules
If you want a read on your specific exposure, send us the details and our partner US expat-tax firm, Capital Tax Limited, replies by email with a scope and fee estimate.