Immigrants should file taxes for several reasons.
More information is available in this brochure published by Legal Aid: Filing Taxes Can Help Immigrants
This brochure is also available in Spanish at: Presentar Declaración de Impuestos Puede Ayudar a los/as Inmigrantes
Consult with a qualified tax preparer or a tax attorney if you have questions about filing tax returns. You may be able to find free tax preparation help by calling 211.