It depends on whether your parents were required to file a return or not. Most immigrants are required to file a tax return if they earned enough, even if they are undocumented. If they don't have a social security number, they can apply for an ITIN--a taxpayer identification number--that they can use to file a tax return if needed. If your parents worked, and earned enough to be required to file, then they must file the return or you will not be able to receive financial aid. If they didn't work in 2016, or they worked, but didn't earn enough to be required to file, choose the answer "My parents are not going to file" for the question that asks if they filed a tax return. The form will then skip over questions that pertain to a tax return. However, even if they weren't required to file, you must still enter the amount of any wages they earned for the question that asks how much they earned from working. This is true even if they were paid under the table, or were self-employed, or chose not to file a return. You can determine whether your parents earned enough to be required to file by using the calculator at the IRS website, www.irs.gov. You can also consult a tax preparer or use tax preparation software like TurboTax. Note: if your parents filed a foreign tax return, talk to your school's financial aid office so they can guide you with how to include this information on the FAFSA.