The tax implications for a foreign investor will depend on whether that person is classified as a resident alien or a non-resident alien. To be considered a non-resident alien, a person must meet several guidelines. First of all, the person cannot have had a green card at any time during the relevant tax reporting period (e.g 2005) and cannot have resided in the U.S. for more than 183 days in the past three years, including the current reporting period. However, non-U.S. citizens who hold green cards and have been in the U.S. for more than 183 days are classified as resident aliens for tax purposes and are subject to different guidelines than non-resident aliens.