All non-residents (for tax purposes) who were present in the U.S. in F-1, F-2, J-1, J-2, M-1, or M-2 status during the previous calendar year must file Form 8843 , even if they received no income during the previous year. This form does not require a social security number or ITIN. For assistance with filing Form 8843, please plan to attend a VITA workshop.
State Income Tax  - If you worked in Iowa State during the year, you are required to file a state income tax return.
Form W-7  - to request ITIN numbers for your dependents.
Form 1040X  - to file an amended return.
Form 4868  - for extension of time to file.