Form 8938
Form 8938 is the FATCA-driven reporting form filed annually with the US tax return by US persons holding foreign financial assets above specified thresholds. It overlaps with — but is not identical to — the FBAR (FinCEN Form 114) reporting requirement. Failure-to-file penalties start at $10,000 and can scale with the size of the unreported assets.
Form 8938 was created by the Foreign Account Tax Compliance Act (FATCA, 2010) as part of a broader US push to ensure foreign-asset reporting by US persons. Unlike FBAR (which is filed separately with FinCEN), Form 8938 is filed with the income tax return on Form 1040.
The filing thresholds depend on filing status and US-vs-foreign residency. For unmarried US-resident filers, Form 8938 is required if foreign assets exceed $50K at year-end or $75K at any point during the year. For married-filing-jointly, the thresholds are $100K / $150K. For US citizens and resident aliens living abroad, the thresholds are $200K / $300K (single) and $400K / $600K (joint). FBAR's threshold is a flat $10K aggregate at any point — substantially lower than Form 8938 in most cases, which is why FBAR catches more filers but Form 8938 catches the larger asset balances.
The scope of 'specified foreign financial assets' is broader than FBAR's 'foreign financial accounts' in some ways and narrower in others. Form 8938 includes foreign stock and securities held outside accounts (e.g. shares held directly with a foreign issuer), foreign partnership interests, foreign-issued life insurance with cash value, and foreign mutual fund holdings. FBAR includes foreign accounts (bank, brokerage, mutual fund) but not directly-held foreign securities. The two are independent obligations; a holder may have to file both, just one, or neither, depending on the specific assets.
For wealth-tech platforms, Form 8938 generation is typically part of a tax-software stack rather than the wealth-management platform itself, but the platform supplies the underlying data: foreign account balances at year-end and at maximum-during-year, foreign-issuer securities holdings, foreign partnership interests, foreign insurance products. Synthetic test data has to include households at multiple threshold tiers (below all thresholds, above FBAR but below 8938, above both) to exercise the threshold-tracking and form-trigger logic.
| Filing status | Year-end threshold | Max-during-year threshold | |
|---|---|---|---|
| US-resident, single | $50,000 | $75,000 | |
| US-resident, MFJ | $100,000 | $150,000 | |
| US-citizen abroad, single | $200,000 | $300,000 | |
| US-citizen abroad, MFJ | $400,000 | $600,000 |
Form-8938-aware synthetic data needs foreign-asset tracking at the household level with year-end and maximum-during-year aggregates, broken down by asset type (foreign accounts, foreign-issuer securities, foreign partnership interests, foreign insurance) so the threshold logic and the form-line-item-population logic can both be exercised. Test households should span the threshold tiers to validate trigger logic.
Common pitfalls
- Treating Form 8938 and FBAR as a single requirement — they're independent; a holder might owe both, one, or neither.
- Aggregating to a single 'foreign assets' total — Form 8938 has separate parts for different asset types with independent computations.
- Missing the higher thresholds for filers living abroad — US citizens and resident aliens abroad have much higher Form 8938 thresholds than US-resident filers.
- Forgetting the maximum-during-year vs. year-end distinction — both matter for threshold determination.
Examples
US-resident married-filing-jointly couple. Year-end foreign accounts: $87,000. Maximum during year: $124,000. Both thresholds tested: year-end $87K < $100K threshold, but maximum $124K < $150K threshold. Both thresholds passed; Form 8938 not required for that year. (FBAR is still required because aggregate foreign accounts exceeded $10K at any point.) Same household next year with year-end $115K: now Form 8938 is required.