Answered on Jul 11th, 2011 at 11:35 AM
Since you state that you worked for 4 years, it appears that your student status lapsed. Unless you changed your status to one that would authorize employment, you currently do not have legal status that would allow you to adjust your status to one of a lawful permanent resident. Paying taxes does not make a difference. A bone fide marriage to a U.S. citizen would be the only exception from that rule. I recommend that you consult with an immigration attorney before you take any steps towards a green card to determine whether you are eligible for adjustment of status. Moreover, your immigration history may even bar you for up to 10 years from obtaining legal status if you leave the U.S. after being without legal status for more than six months. On the other hand, if you are currently in lawful status, you must first identify a basis for seeking a green card as an adjustment application hinges on an immigrant visa petition. Such a visa petition can be based on an offer of employment, qualifying family relations, or winning the annual diversity lottery.