A foreign national coming to the US with visa authorization must not overstay their visa duration as this can lead to serious consequences. For example, if you came to the US on a visitor visa, specifically the B-2 tourist visa, it allows you to stay in the US for 6 months. You are expected to depart the country when your visa expires.
However, certain situations may arise that lead you to overstay your visa.
What Is Visa Overstay?
An overstay is when you stay in the US longer than your visa authorization allows. All US visas have an expiration date, meaning that you must leave the country by the time your visa expires. However, if for some reason you are unable to leave the country, then it can lead to serious consequences.
If it is discovered by the US Citizenship and Immigration Service (USCIS) that you overstayed your visa, then you may get barred from returning to the US or extend your visa. You may also be subject to visa voidance and the inability to apply for visas at different consulate posts in hopes of finding one more sympathetic to your case.