If you have overstayed by more than 180 days but less than 365, as soon as you depart the US, you will automatically trigger the 3 year bar to reentry, which can only be waived by a showing of extreme hardship to a US citizen spouse, which is fairly difficult to do in most cases. If you do not have a US citizen spouse, then it is obviously going to be impossible to prove extreme hardship. Once the 3 years are up, you will be eligible for a visa but you will not be able to travel on the VWP any longer even though you will still be a citizen of a visa waiver country because as soon as you violated the terms of the VWP, you can no longer utilize it.
Answered on May 14th, 2013 at 10:13 PM