All Totalization agreements include rules that eliminate dual U.S. and foreign social
security coverage of the same earnings. Consequently, some workers who had been subject
to dual coverage prior to the entry into force of an agreement will become exempt
from U.S. coverage beginning with the agreement’s effective date. Frequently, workers
exempted from U.S. coverage by an agreement will already have enough covered earnings
in the year the agreement enters into force but before the effective date of the agreement
to be credited with QCs after the calendar quarter in which the agreement takes effect.