Assume an individual works until June 30, 1986; is first absent from employment on July 1, 1986, on account of maternity or paternity absence; and on July 1, 1989, performs an hour of service. The period of service must include the period from employment commencement date until June 30, 1987 (one year after the date of separation for any reason other than a quit, discharge, retirement, or death). The period from July 1, 1987, to June 30, 1988, is neither a period of service nor a period of severance. The period of severance would be from July 1, 1988, to June 30, 1989.
26 C.F.R. §1.410(a)-9