It depends on whether or not you qualify as a resident alien. As a foreign national temporarily in the U.S. and now under an H-1 visa, you must file Form 1040NR (PDF), U.S. Nonresident Alien Income Tax Return and Form 8843 (PDF), Statement for Exempt Individuals and Individuals with a Medical Condition (if you do not meet the substantial presence test). In order to file a Form 1040, Individual Tax Return, you must meet the substantial presence test. Please refer to Publication 519, U.S. Tax Guide for Aliens , for a detailed discussion of the Substantial Presence Test. You may also qualify to file as a dual status taxpayer for the year of your visa change. Refer toTax Topic 852 , for dual status information.

References:

• Publication 513, Tax Information for Visitors to the United States
• Publication 519, U.S. Tax Guide for Aliens
• Form 1040NR (PDF), U.S. Nonresident Alien Income Tax Return
• Instructions for Form 1040NR, U.S. Nonresident Alien Income Tax Return
• Form 8843 (PDF), Statement for Exempt Individuals and Individuals with a Medical Condition
• Tax Topic 851, Resident and nonresident aliens
• Tax Topic 852 , Dual Status Alien

Generally, services performed by you as a nonresident alien temporarily in the United States as a nonimmigrant under subparagraph (F), (J), (M), or (Q) of section 101(a)(15) of the Immigration and Nationality Act are not covered under the social security and medicare programs if the services are performed to carry out the purpose for which you were admitted to the United States. This means that there should be no withholding of social security or Medicare taxes from the pay you receive for these services. These types of services are very limited, and generally include only on-campus work, practical training, and economic hardship employment. However, you are covered under the social security and medicare programs for these services if you are considered a resident alien, even though your nonimmigrant classification ("F," "J," "M," or "Q") remains the same. Social security and Medicare taxes will be withheld from your pay.

Additionally, any student who is enrolled and regularly attending classes at a school, college, or university may be exempt from social security and Medicare taxes on pay for services performed for such school, college, or university.

References:

• Publication 519, U.S. Tax Guide for Aliens
• Publication 597, Information on the United States-Canada Income Tax TreatyPublication 515 (PDF) , Withholding of Tax on Nonresident Aliens and Foreign Entities

The following discussion generally applies only to nonresident aliens. Wages and other compensation paid to a nonresident alien for services performed as an employee are usually subject to graduated withholding at the same rates as resident aliens and U.S. citizens. Therefore, your compensation, unless it is specifically excluded from the term "wages" by law, or is exempt from tax by treaty, is subject to graduated withholding. Nonresident aliens must follow modified instructions when completing Form W-4. Please refer to Publication 519, U.S. Tax Guide for Aliens, for directions on completing Form W-4 (PDF), Employee's Withholding Allowance Certificate .

References:

• Publication 519 , U.S. Tax Guide for Aliens
• Publication 597, Information on the United States-Canada Income Tax TreatyPublication 515 (PDF) , Withholding of Tax on Nonresident Aliens and Foreign Entities
• Form W-4 (PDF), Employees Withholding Allowance Certificate

If you are in the United States solely for the purpose of your education, training, or obtaining special technical experience, you may be able to exclude from your income grants or awards that you receive from a government, scientific, educational, or other tax-exempt organization. You also may be able to exclude payments that you receive from abroad for the purpose of your maintenance, education, study, research, or training and up to $5,000 of income that you receive from personal services performed in the United States. Please refer to Publication 901 , U.S. Tax Treaties, for further details.

References:

• Publication 513 , Tax Information for Visitors to the United States
• Publication 519, U.S. Tax Guide for Aliens
• Tax Topic 421, Scholarship and fellowship grants
• Publication 901 , U. S. Tax Treaties