Citizens and residents employed by the subsidiary. If you are entitled to Social Security benefits from both the United States and Korea and do not need the agreement to qualify for either benefit, the amount of your U.S. benefit may be reduced. This is the result of a provision in U.S. law that may affect how your benefit is calculated if you are also receiving a work-based pension that has not been covered by U.S. Social Security. For more information, call our toll-free number 1-800-772-1213 and receive the windfall elimination commission (publication number 05-10045). If you are outside the United States, you can write to us at the address in the “More Information” section.