Tennessee Code Title 40. Criminal Procedure § 40-28-609

(a) Whenever the director is satisfied that a parolee has kept the conditions of parole in a satisfactory manner, the director shall issue to the parolee a certificate of final discharge. This final discharge from parole will be granted only after a parolee has completed the maximum sentence imposed, less diminution allowed for good and honor time and incentive time and sentence credits earned and retained. If a parolee is not eligible for a certificate of discharge because of a pending violation, parole will expire at the end of the maximum sentence less diminution for good and honor time, incentive time and sentence credits earned and retained, plus delinquent time.

(b) This is in no way to be construed as permitting a discharge from parole for parolees with a life sentence.