Not declaring foreign income to the IRS can lead to severe civil and criminal penalties, including fines of over $10,000 for non-willful violations, 50% of the account balance for willful violations, and possible imprisonment. The IRS, empowered by FATCA, enforces strict reporting on foreign assets, accounts, and income.
Specified foreign financial assets
If the IRS mails you a notice about failing to file a Form 8938 and you don't file the form within 90 days, an additional continuation penalty of $10,000 for each 30-day period after the 90-day period has expired may apply.
Your name appears on foreign financial accounts passed on to the IRS. Your children, applying to universities in the US, provide information about your income sources. Your name appears in another US expat's foreign business documents or tax returns submitted to the IRS.
Overseas income
the undeclared tax. a penalty worth up to double the tax you owe.
Undisclosed or inaccurate details of foreign assets: If a person who has filed tax returns does not disclose his foreign income, or submits inaccurate details of the same, he has to pay a fine of Rs 10 lakh.
The U.S. allows a Foreign Earned Income Exclusion (FEIE), letting you exclude a significant amount of your foreign wages from U.S. tax; for 2024, it's $126,500, and for 2025, it's projected to be around $130,000, plus potential housing cost exclusions, to avoid double taxation, though you must file U.S. taxes and meet residency tests. This applies to earned income (wages, salaries), not passive income like interest or dividends.
What happens if you file FBAR late? There is no late FBA R penalty but there are non-filing penalties. If it is determined that you were willful, the penalty can be up to 50% of the value of the account.
HMRC will share information with the tax authority of another country (where we have an agreement in place to do so) if the account is held by one of their tax residents. In turn, HMRC will receive information about UK tax residents who hold accounts outside of the UK.
Computer Data Analysis. The IRS uses an Information Returns Processing System to match information sent by employers and other third parties to the IRS with what is reported by individuals on their tax returns. 3 The matching is based on information returns submitted to the IRS on: W-2s (reporting wages)
If you don't include taxable income on your return, it can lead to penalties and interest. The IRS may charge penalties and interest beginning from the date they think you owe the tax. There are times when leaving a 1099 off of your tax return doesn't change it.
Further, expatriated individuals will be subject to U.S. tax on their worldwide income for any of the 10 years following expatriation in which they are present in the U.S. for more than 30 days, or 60 days in the case of individuals working in the U.S. for an unrelated employer.
If you qualify, you can exclude up to $130,000 of foreign earned income in 2025 ($126,500 in 2024) from US federal income tax. It applies to both US citizens and Green Card holders living overseas.
Criminal Charges and Prosecution
In the most serious cases of IRS audit unreported income, the government may pursue criminal charges.
ATO audit triggers explained: ATO reviews are commonly triggered by missing or under-reported income, unusually high or unsupported deductions, results that differ from industry benchmarks, and income that appears inconsistent with assets or lifestyle. Accurate reporting and proper records reduce the risk of review.
In addition to reporting foreign income on your personal tax return, if you own specified foreign property with a total cost of more than $100,000 CAD, the details must be reported on form T1135. This form is due on the same day as your personal tax return and carries penalties from $100-$2,500 if it is filed late.
No, the IRS doesn't catch every instance of unreported income, but their advanced data-matching systems catch most discrepancies involving third-party reporting (like W-2s, 1099s for freelance/interest/dividends) through automated checks, leading to CP2000 notices and potential penalties if missed; however, cash income, crypto, or lifestyle mismatches can also trigger scrutiny, though it's less certain than reported income, and high-income non-filers are a current focus.
You know the IRS might be investigating you through official mail (first contact), phone calls (often with automated messages to IRS.gov), or in-person visits, but signs of a criminal probe include contact with IRS Criminal Investigation (CI) agents, subpoenas to you or your bank, questions to your accountant/bank, unusual account activity (freezing/refusing transactions), or agents suddenly going silent after an audit. Key indicators are official IRS letters, contact from CI special agents, third-party inquiries, and formal summonses for records, signaling serious scrutiny beyond a simple audit.
As a U.S. taxpayer, you can face penalties for failing to report your foreign-earned income even if you don't owe any federal income tax. The IRS penalizes both failures to report and failures to pay and the penalties for reporting violations can be substantial.
How the IRS Tracks Offshore Assets. Virtually all major global financial institutions now report details of U.S. account holders to the IRS—or face steep withholding taxes on U.S.-sourced income.
Unexplained bank deposits are the top trigger for HMRC tax investigations. Can HMRC see my personal bank accounts? Yes, HMRC can access data from banks, payment platforms, and other sources.
Who Must File the FBAR? A United States person that has a financial interest in or signature authority over foreign financial accounts must file an FBAR if the aggregate value of the foreign financial accounts exceeds $10,000 at any time during the calendar year.
There's no official limit to how many years you can go without filing taxes, but the IRS expects you to file if required, and the statute of limitations on the IRS assessing tax or collecting never starts until you actually file, meaning they can pursue unfiled returns from any year, even decades old. While the IRS often focuses on the last six years, waiting increases penalties and interest, and you risk losing any potential refunds after three years; proactively filing past-due returns is always best.
The IRS can assess FBAR penalties for up to six years from the date the return is due. This means if you're catching up on delinquent FBARs, you typically need to file for the past six years at most.