The impact of an overstay in the United States, and whether it can be "forgiven" by U.S. immigration authorities, depends on the how long you stayed and what immigration benefit you are currently seeking. U.S. immigration laws contain various penalties for people who overstay a visa. Nevertheless, there are situations in which you can apply for legal forgiveness or a waiver, and receive a U.S. immigration benefit (such as a green card) despite your overstay.
First, a bit of clarification: An "overstay" means that one entered the U.S. lawfully, most likely based on a visa or with a visa waiver, but then didn't leave on time. The required time by which someone must leave is normally shown on a document called an I-94, which the U.S. border official creates upon the person's entry and is, for most people, available in an online database. So, to calculate the length of your overstay, you'll need to count forward from the date on your I-94.
Don't confuse the I-94 expiration date with that shown on the visa itself. The visa expiration date shows how long you can use it to enter the U.S., not how long you can stay in the United States after entry.
If you entered the U.S. on a student visa, your I-94 will likely say "D/S," for duration of status. That means your overstay begins when you stop studying or complying with the terms of your visa. However, whether that overstay makes you inadmissible in the future depends on whether you actually accrued "unlawful presence," a separate legal definition. Students do not accrue unlawful presence until and unless an immigration official or judge has deemed them unlawfully present.
Even if you have stayed past the permitted departure date on your visa by one day—assuming you didn't file for a change or extension of status before the departure date—the visa will be automatically voided and cancelled. What's more, you won't be able to apply for a new visa at any consulate outside of your home country.
There is no waiver or forgiveness for this. But if you did, in fact, file for a change or extension of status before the departure date, and that is eventually granted, none of your overstay will count against you. But if your request is ultimately denied, you're out of luck—all time past the date you were supposed to depart will count against you.
If your overstay in the United States was for less than six months (180 days), then you are not legally inadmissible in the future. You can be granted another visa, or even a U.S. green card (lawful permanent residence).
However, if you are applying for a temporary (nonimmigrant) visa, and it's one of the many that requires you to convince the U.S. consular official that you will leave the United States when your permitted stay is over, you might have a tough time making this showing if and when the consular officer becomes aware of your past overstay.
You may face severe penalties for overstaying a U.S. visa by more than six months, as described below. We're assuming that during of your overstay, you were simultaneously accruing what's known as "unlawful presence." But see below for exceptions to this.
The key here is to understand that these consequences apply only if you depart the United States and attempt to return. In a few rare instances, people eligible for green cards can avoid these penalties by adjusting status within the U.S.—that is, submitting all their paperwork to U.S. Citizenship and Immigration Services (USCIS) and attending their interview within the United States.
However, you might not have a choice about whether to adjust status. Only limited categories of people are eligible to use this procedure. For example, people who entered the U.S. illegally (without a visa or other lawful admission) cannot adjust status (except in rare cases where old laws apply to them). Such people would, despite being technically eligible for a green card, have to apply for it through a U.S. consulate in their home country, at which time the time bar penalties could be applied against them.
You won't accrue unlawful presence for purposes of the three- and ten-year time bars described above if and when you:
If you're not in one of these categories, it's likely that your unlawful presence and overstay can be held against you. And if you are subject to the permanent bar, USCIS argues that none of these exceptions apply. (Talk to a lawyer if you are in this situation, just in case the laws or policy change.)
A waiver is available to people who can demonstrate that if they are not granted the requested immigration benefit, such as a green card, their U.S. citizen or lawful permanent resident spouse or parents would suffer extreme hardship.
But extreme hardship is notoriously difficult to prove. It means demonstrating more than the hardship that any family member would feel upon facing separation due to denial of a visa. You'd want to be able to show severe financial, emotional, or medical consequences to one of your U.S. family members.
To avoid facing a three or ten-year bar to return upon attending a visa interview at a U.S. consulate, green card applicants should see Staying in the U.S. With the I-601A Provisional Waiver of Inadmissibility.
Definitely get a lawyer's help if you're considering applying for one of these waivers. The lawyer can help assess whether your local consulate is likely to be sympathetic to your waiver request (some are more sympathetic than others), and help you gather documents and affidavits in support of your family's claim to extreme hardship.