Ind. Code § 25-14.5-6-1

Sec. 1. (a) Subject to IC 25-1-2-6(e), a certificate issued by the board expires on a date established by the agency under IC 25-1-5-4 in the next even-numbered year following the year in which the certificate was issued.

(b) An individual may renew a certificate by paying a renewal fee on or before the expiration date of the certificate.

(c) If an individual fails to pay a renewal fee on or before the expiration date of a certificate, the certificate becomes invalid.