Under the Legal Immigration Family Equity Act (LIFE Act) and its amendments, the K visa allows the spouse and unmarried children (below the age of 21 years) of a U.S. citizen to enter, live and work in the U.S. as nonimmigrants until they receive Lawful Permanent Resident status. The spouse is given a K-3 visa and the children are given a K-4 visas.
You can receive a K-3 (Spouse) visa if:

• You have married a U.S. citizen.
• Your U.S. citizen spouse has filed Form I-130 (Petition for Alien Relative) with USCIS for you.
• You want to enter the U.S. to wait for the approval of the petition to become a Lawful Permanent Resident.
• You have forwarded an approved Form I-129F (Petition for Alien Fiancé) to the U.S. Consulate (which issues immigrant visas) in the country where you were married. If you were married in the U.S., the approved petition has to be forwarded to a consulate which has jurisdiction over the area where you reside.

You can receive a K-4 (Child) visa if:

• You are unmarried and under the age of 21 years.
• You are the child of a foreign national who is eligible for a K-3 visa.

There are two advantages to having a K-3/K-4 non-immigrant visa:

• You are allowed to work in the U.S. while waiting for your Permanent Resident status. However, in order to do this you must have a work permit. To apply for a work permit, submit Form I-765 (Application for Employment Authorization) to the USCIS center in Chicago.