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- Community Property States – How to Allocate Income (Separated Spouses)
- Dual-Status Taxpayer
- Foreign Nationals – Aliens – Resident or Nonresident (Dual-Status)
- Form 1040-NR – Cannot File Jointly
- Form 1040-NR – Itemized or Standard Deduction
- Form 1040-NR Income – Whether Effectively Connected
- Form 8833 – Tax Treaty Return
- Form 8840 – Closer Connection Exception Statement for Aliens
- Form 8843 – Statement for Exempt Individuals and Individuals with a Medical Condition
- Form 8965 Health Coverage Exemptions – Who Must File
- Head of Household – Nonresident Alien Spouse
- Married Filing Joint – Spouse of Nonresident Alien or Dual-Status Alien Treated as Resident
- Married Filing Joint or Married Filing Separate – Filing State Return with Spouse as Nonresident Alien
- Schedule NEC – Tax on Income Not Effectively Connected With a U.S. Trade or Business