Even if the worker meets the earnings requirement for Social Security credits, he or she cannot earn a credit for a calendar quarter if the calendar quarter:
Begins after the quarter that the worker died;
Has not started yet; or
Is within a prior period of disability that is excluded in figuring benefit rights. (However, the beginning and ending quarters of the prior disability period may be counted as credits if the earnings requirements in §212 are met in these quarters.)
Note: A calendar quarter can only be counted once as a credit.