US expat taxes are unique because Americans must file annual returns regardless of where they live. Unlike most countries, the US taxes citizens on worldwide income, not just domestic earnings. However, expats can reduce double taxation through the Foreign Earned Income Exclusion (FEIE) or Foreign Tax Credit (FTC).
Additional filings like FBAR (for foreign bank accounts) may apply. Proper planning ensures compliance while maximizing tax benefits. Consulting a specialist in US expat taxes is highly recommended.