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US nonresident aliens are generally taxed on US source income. Is your income taxable in the U.S.? You may be exempt and get a tax refund.

Do I have to file a US tax return? Should I file a US tax return? Can I file my tax by myself?

U.S. citizens or resident aliens are subject to tax on their worldwide income. How to avoid double taxation? How Do I file a US return?

US citizens are required to report their worldwide income on form 1040 annually if they meet their filing obligations and claim a refund too