Concept
For a U.S. citizen or resident alien, the annual U.S. return reports worldwide income rather than U.S.-source income alone. The United States is one of the very few countries that taxes on the basis of citizenship instead of residence, so the duty to file follows the passport across every border. The IRS page for U.S. citizens and resident aliens abroad confirms that income from all sources is subject to U.S. tax and must be reported under the Internal Revenue Code.
Worldwide reporting rarely produces worldwide double taxation. The foreign earned income exclusion, the foreign tax credit, treaty rules and entity-specific regimes each reduce or reshape the U.S. result, and they apply only to income that has first been classified and reported. The exclusion is capped at $130,000 of foreign earned income per qualifying person for 2025 and $132,900 for 2026, indexed each year.
Filing frame
A typical U.S. person abroad starts with Form 1040. The rest of the package depends on income type, assets and structures.
- Employment income may require Form 2555 or Form 1116.
- Self-employment may require Schedule C and self-employment tax analysis.
- Foreign tax payments may require Form 1116.
- Foreign bank accounts may require FBAR.
- Specified foreign financial assets may require Form 8938.
- Foreign corporations may require Form 5471 and Form 8992.
- Foreign partnerships and branches may require Form 8865 or Form 8858.
- Foreign funds may require Form 8621.
- Foreign trusts and large gifts may require Form 3520 or Form 3520-A.
Timing
U.S. citizens and resident aliens abroad receive an automatic extension to June 15 to file, provided they are outside the United States on the regular April due date. That extension postpones filing, not payment: interest still runs on tax left unpaid after April, and filing Form 4868 carries the deadline to October 15. Estimated tax can matter where there is no U.S. withholding, especially for self-employment, investment gains, rental income, CFC inclusions, or large foreign-source income.
FBAR is filed separately through FinCEN, not with the income tax return, once the combined value of foreign financial accounts passes $10,000 at any point in the year. The IRS page comparing Form 8938 and FBAR makes clear that Form 8938 does not replace the FBAR, and most people abroad file both reports.
Income types
| Income | Main question | Risk |
|---|---|---|
| Foreign salary | Is it foreign earned income, and are FEIE or FTC available? | Claiming relief without a foreign tax home or presence test |
| Consulting or self-employment | Is Schedule C required, and does self-employment tax apply? | Assuming FEIE removes social security tax |
| Dividends and interest | Are they ordinary foreign passive items, CFC items, or PFIC items? | Missing Form 8621 or Form 5471 |
| Capital gains | What is U.S. basis, holding period, source, and FX treatment? | Using foreign broker statements without U.S. basis |
| Crypto | Which transactions are disposals, income, staking, mining, or transfers? | Weak wallet and exchange records |
| Rental income | What are gross rents, expenses, depreciation, local taxes, and FX? | Assuming local return controls U.S. result |
| Foreign pension | Is there treaty relief, trust classification, or PFIC exposure? | Treating every foreign pension as a simple retirement account |
| Company income | Is there CFC, Subpart F, section 951A, dividend, salary, or loan treatment? | Retained earnings treated as invisible |
Company income carries the heaviest classification load. A controlled foreign corporation pulls in Subpart F and the section 951A regime, taxed as GILTI for years through 2025. Legislation enacted in 2025 (the One Big Beautiful Bill Act) renamed it net CFC tested income (NCTI) from 2026 and reshaped it: the deduction for 10% of tangible assets (QBAI) is gone, the section 250 deduction sits permanently at 40% for a corporate effective rate near 12.6%, and the foreign tax credit haircut narrows from 20% to 10%. An individual shareholder abroad usually reaches those corporate-rate mechanics only through a section 962 election, so retained earnings do not defer the analysis.
Crypto
The IRS page for U.S. citizens abroad notes that virtual currency transactions must be reported and are taxable by law like other property transactions. Exchange exports, wallet histories, transfers, staking rewards, mining income, airdrops, lending and DeFi activity each need a U.S. tax method. The hard part is evidence: foreign exchanges may close, restrict exports, or report differently from U.S. software, so the file should preserve raw exports and a reproducible calculation, not only a final spreadsheet.
Self-employment
Foreign earned income exclusion does not automatically remove self-employment tax. A U.S. citizen abroad who invoices through a sole proprietorship or disregarded structure may still need Schedule C and self-employment tax analysis. Where the country of residence has a social security totalization agreement with the United States, that agreement can decide which system covers the work. The common digital-nomad trap: little U.S. income tax after FEIE or FTC, but U.S. self-employment tax or local social security still due.
Foreign taxes
Foreign taxes should be captured by country, tax type, tax year, payment date and income category. Foreign tax credit is not a single bucket. The IRS foreign tax credit materials explain that foreign taxes on income excluded under foreign earned income exclusion or housing exclusion cannot also be used for the credit. That double-dipping rule drives much of the FEIE vs FTC decision.
What changed for 2026
Two recent shifts matter for anyone reporting worldwide income. First, the inflation-indexed foreign earned income exclusion rose to $130,000 for 2025 and $132,900 for 2026, so the foreign salary that clears before any U.S. cash tax climbs a little each year. Second, the controlled foreign corporation rules changed both name and arithmetic: GILTI became net CFC tested income from 2026, the 10% tangible-asset deduction disappeared, and the section 250 deduction was fixed at 40%. The reporting workflow stayed the same, but the numbers behind a CFC inclusion did not. For a shareholder weighing whether to keep U.S. status at all, those inclusions feed straight into the expatriation and exit-tax calculation.
Checklist
- Build a worldwide income list before preparing Form 1040.
- Separate earned income, passive income, capital gains, rents, pensions, crypto, and entity income.
- Collect foreign tax assessments and payment evidence.
- Identify all foreign accounts and maximum values for FBAR.
- Identify specified foreign financial assets for Form 8938.
- Check foreign companies for Form 5471 and Form 8992.
- Check foreign funds and ETFs for PFIC and Form 8621.
- Check foreign trusts, gifts, and inheritances for Form 3520 and Form 3520-A.
- Review estimated tax exposure before the filing deadline.
- Keep FX methodology consistent and documented.
Common mistakes
- Reporting only income that has a U.S. Form W-2, 1099, or K-1.
- Ignoring foreign broker accounts because no U.S. tax form arrived.
- Claiming FEIE for passive income, capital gains, pensions, or CFC inclusions.
- Taking foreign tax credit on income already excluded by FEIE.
- Treating foreign crypto exchanges as outside U.S. reporting.
- Forgetting that FBAR and Form 8938 are separate reports.
- Waiting until filing season to reconstruct ownership of foreign companies or trusts.
Advisor trigger
A U.S. international CPA can handle ordinary annual filing, FEIE, FTC, FBAR, Form 8938 and investment reporting. A U.S. tax attorney should be involved where there are prior-year omissions, foreign entities, PFICs, trusts, crypto gaps, IRS notices, treaty positions, or any question about willfulness.
Q&A
Does worldwide income mean every item is taxed twice
No. Worldwide reporting is the starting point, not the final bill. Foreign earned income exclusion, foreign tax credit and treaty rules can reduce or eliminate the U.S. tax on the same income, but the income still has to be classified and reported.
Does income without a U.S. tax form stay off the return
No. A foreign broker, employer or platform may never issue a Form 1099, W-2 or K-1, but the income is still reportable. The return should be built from a global inventory of income and accounts, not from the U.S. forms that happened to arrive.
Does FEIE remove self-employment tax
No. FEIE is an income tax exclusion. A self-employed U.S. person abroad can still owe U.S. self-employment tax on Schedule C income. A social security totalization agreement with the country of residence can decide whether the U.S. or the foreign system covers the work.
How is foreign crypto activity treated
As property transactions. Disposals, staking, mining, airdrops, lending and DeFi each need a U.S. tax method, and the practical risk is evidence. Raw exchange and wallet exports plus a reproducible calculation should be preserved, because foreign platforms can close or restrict access.
What happens to a foreign company's retained earnings
They are not invisible. A controlled foreign corporation brings Form 5471, Subpart F and the section 951A regime — GILTI for years through 2025, net CFC tested income (NCTI) from 2026 — and current inclusions can apply even with no dividend paid.