Whether it's by crossing the U.S. border with a "coyote" or buying a fake U.S. passport, a foreign national who enters the U.S. illegally can be both convicted of a crime and held responsible for a civil violation under the U.S. immigration laws. Illegal entry also carries consequences for anyone who might later attempt to apply for a green card or other immigration benefit.
The penalties and consequences get progressively more severe if a person enters illegally more than once, or enters illegally after an order of removal (deportation) or after having been convicted of an aggravated felony.
The immigration law actually uses the term "improper entry," which has a broad meaning. It's more than just slipping across the U.S. border at an unguarded point. Improper entry can include:
(See Title 8, Section 1325 of the U.S. Code (U.S.C.), or Section 275 of the Immigration and Nationality Act (I.N.A.) for the exact statutory language - www.uscis.gov/laws/immigration-and-nationality-act.)
For the first improper entry offense, the person can be fined (as a criminal penalty), or imprisoned for up to six months, or both.
For a subsequent offense, the person can be fined or imprisoned for up to two years, or both. (See 8 U.S.C. Section 1325, I.N.A. Section 275.)
But just in case that isn't enough to deter illegal entrants, a separate section of the law adds penalties for reentry (or attempted reentry) in cases where the person had been convicted of certain types of crimes and thus removed (deported) from the U.S., as follows:
What's more, someone deported before a prison sentence was complete may be incarcerated for the remainder of the sentence of imprisonment, without any reduction for parole or supervised release.
(See 8 U.S.C. Section 1326, I.N.A. Section 276.)
Entry (or attempted entry) at a place other than one designated by immigration officers carries additional civil penalties. The amount is at least $50 and not more than $250 for each such entry (or attempted entry); or twice that amount if the illegal entrant has been previously fined a civil penalty for the same violation. (See 8 U.S.C. Section 1325, I.N.A. Section 275.)
A person who comes to the US without permission of the immigration authorities is inadmissible. To learn more about inadmissibility, see Who Can't Get Into The United States?
In practice, that usually means that if the person became eligible for a green card or other immigration status, he or she would be ineligible to adjust status within the United States. By leaving the U.S. and applying from overseas, the inadmissibility problem could be solved – unless the person had already stayed in the U.S. for six months or more without a right to be there. In that case, he or she would run into a separate ground of inadmissibility, based on "unlawful presence" in the United States. (For more on how that affects your possibilities of obtaining a green card, see Legal Options for an Undocumented Immigrant to Stay in the U.S.)
If a person was removed from the U.S. (deported) on the basis of a conviction for an aggravated felony (other than illegal entry or reentry), then the improper entry itself is considered to be an aggravated felony. (See 8 U.S.C. § 1101(a)(43)(O).) Having one of more aggravated felonies on one's record is a huge problem, because aggravated felonies bar a person from virtually all immigration benefits, and are a grounds of deportability (under 8 U.S.C. 1227, I.N.A. Section 237).
This article can help acquaint you with the laws affecting illegal entry. However, if you have entered the U.S. illegally, and are hoping to apply for a green card or other immigration benefit, you should absolutely see an immigration attorney for a personal analysis of your situation. You might benefit from exceptions not described here.