None, if you qualify as a resident alien under the substantial presence or green card tests. Resident aliens file just as if they were US citizens.Form 1040NR and 1040NR-EZ are for nonresident aliens. Form 1040NR-EZ is filed if you are a nonresident alien and:You claim no dependents.You cannot be claimed as a dependent.Your only US source income comes from wages, salaries, tips, refunds of state and local income taxes, and/or scholarships and fellowship grants.Your taxable income is less than $100,000.You claim no tax credits (e.g. education credits).You make no adjustments to your income other than the student loan interest deduction, and you exclude no income other than the exclusion for scholarship and fellowship grants (these are directed mostly at foreign graduate students and teaching assistants).You do not claim your spouse's exemption, if married.You can claim no itemized deductions other than the deduction for state and local income taxes.You are not an expatriate (a former US citizen or former long-term US resident, defined as an individual who held a green card for at least eight of the preceding 15 years).You own no taxes other than Federal income tax and/or unreported Social Security and Medicare taxes.You do not claim a credit for excess social security tax withheld.