For tax purposes, an alien is an individual who is not a U.S. citizen. Aliens are classified as nonresident aliens and resident aliens. This publication will help you determine your status and give you information you will need to file your U.S. tax return. Resident aliens generally are taxed on their worldwide income, the same as U.S. citizens. Nonresident aliens are taxed only on their income from sources within the United States and on certain income connected with the conduct of a trade or business in the United States.

Table A, What You Need To Know About U.S. Taxes, provides a list of questions and the chapter or chapters in this publication where you will find the related discussion.

Table A. What You Need To Know About Taxes

The information in this publication is not as comprehensive for resident aliens as it is for nonresident aliens. Resident aliens are generally treated the same as U.S. citizens and can find more information in other IRS publications.

Comments and suggestions. We welcome your comments about this publication and your suggestions for future editions.

You can e-mail us while visiting our web site at www.irs.gov/help/email2.html.

You can write to us at the following address:

Internal Revenue Service
Technical Publications Branch
W:CAR:MP:FP:P
1111 Constitution Ave. NW
Washington, DC 20224

We respond to many letters by telephone. Therefore, it would be helpful if you would include your daytime phone number, including the area code, in your correspondence.

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