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Treas. Reg. за1.403(B)-1(f)(2). It says that in determining the exclusion allowance of an employee, you treat the employee as not being employed by the employer for any period in which the employer was not a type of entity entitled to maintain a 403(B) plan. Thus, if part of an employer (the nonfederal part) was entitled to make 403(B) contributions, and part (the federal part) was not, you would count only the years the person worked for the federal part.
Note that the situation would be different if the employer as a whole was entitled to maintain a 403(B) plan, but chose to include only a segment of the employees it was entitled under the Internal Revenue Code to cover. Under those circumstances, the employee could take into account all service, even service in a position ineligible for the plan under the employer's rules.
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