When Gregory Ashworth married Siriporn Charoenwong in a traditional Buddhist ceremony in Chiang Mai, he believed the happiest chapter of his life was finally beginning. After five years living in Thailand, where he had won two significant Thai Government Lottery prizes totaling nearly $980,000, Ashworth had found both financial success and personal happiness in Southeast Asia. What he had not found — and what would ultimately drag both him and his new Thai wife into a federal investigation that consumed three years of their married life — was a qualified international tax attorney who could have warned him about the catastrophic legal consequences of combining unreported foreign lottery income with an international marriage to a foreign national without proper IRS disclosure of either the funds or the relationship.

The IRS investigation that eventually targeted both Ashworth and his wife began through a channel that neither of them anticipated. When Ashworth filed his federal tax return for the year of their marriage, he correctly listed his new wife as a foreign spouse and filed the required IRS Form W-7 to obtain her Individual Taxpayer Identification Number. That routine filing — done correctly and in complete good faith — triggered an automatic IRS system flag that cross referenced his return against existing FATCA data on file for his Thai bank accounts. The cross reference identified a US citizen with significant Thai bank account balances who had never reported foreign income, had never filed an FBAR, and had just married a Thai national whose own financial records were now subject to IRS scrutiny as the spouse of an American taxpayer.

The legal complexity facing married couples where one spouse is an American taxpayer with unreported foreign income and the other is a foreign national is one of the most intricate areas of international tax law that exists in the entire federal tax code. When a US citizen marries a foreign national and elects to file a joint federal tax return — as Ashworth had done to maximize his available tax deductions — the foreign spouse's worldwide income becomes subject to US federal taxation for the entire tax year of the marriage election. This means Siriporn's Thai income, Thai bank accounts, and Thai financial assets became legally reportable to the IRS the moment she appeared on Ashworth's joint federal return. IRS examiners reviewing the couple's combined financial picture found undisclosed Thai assets on both sides of the marriage that compounded the reporting failures significantly beyond what Ashworth's lottery income alone had created.

Federal investigators assigned to the case spent eleven months building a comprehensive financial picture of both spouses before making initial contact. They obtained three years of Ashworth's Thai banking records through the FATCA information exchange framework. They obtained Siriporn's Thai financial records through a separate mutual legal assistance treaty request that Thai authorities processed in cooperation with the US Department of Justice. They documented Ashworth's two FBAR filing failures covering his lottery prize accounts. And they identified a pattern of fund transfers between Ashworth's Bangkok accounts and his wife's Thai accounts that federal prosecutors characterized as an attempt to distribute unreported lottery funds across multiple accounts to complicate IRS tracing efforts.

The couple retained separate federal tax defense attorneys immediately upon receiving IRS