Form 8938 (Statement of Specified Foreign Financial Assets) is based on asset value and is filed with the tax return. A specified person, whether a specified individual such as a citizen or resident alien or a specified domestic entity formed to hold foreign assets, reports where the total exceeds the applicable threshold. The asset list has two parts: financial accounts at foreign institutions, and investment assets held outside accounts such as non-U.S. stock, interests in foreign entities, and contracts with non-U.S. counterparties. Thresholds move with the filer's situation: marriage, joint filing, and residence inside or outside the United States all matter. An unmarried filer living in the United States meets the line above $50,000 on the last day of the year or $75,000 at any point, while joint filers living in the United States meet it above $100,000 on the last day of the year or $150,000 at any point. Filers living outside the United States face higher thresholds. The form attaches to the annual return, from Form 1040 to Forms 1041, 1065, and 1120, and is filed by that return's due date with extensions. Accounts at U.S. payers, holdings under the dealers' mark-to-market rules, and the foreign equivalent of Social Security stay out. Filing Form 8938 does not relieve the FBAR duty where it otherwise applies; each filing stands on its own.
Worked example
A married couple living in the United States and filing jointly holds a $90,000 French brokerage account and $40,000 of foreign corporate stock outside any account. Their $130,000 total on December 31 exceeds the $100,000 last-day line for joint filers, so they attach Form 8938 to their joint return. Had the same couple held only a $40,000 domestic mutual fund account, nothing would be reportable on the form.