Conn. Agencies Regs. § 10-183l-12
An employer required to make the contributions mandated by section 10-183n of the Connecticut General Statutes shall make such contributions only with respect to months for which the member will receive credited service under section 10-183e of the Connecticut General Statutes and regulation section 10-183l-2. Thus, the employer of a member who starts teaching on the first day of a school year and terminates on March 10th of the same school year shall pay to the board the required percentage of one tenth of the member's annual salary as defined in sections 10-183b and 10-183kk of the Connecticut General Statutes for each of the months September through March inclusive of such school year. Similarly, the employer of a member who starts teaching on October 15 of a school year and continues teaching until the last day of the school year in June shall pay to the board the required percentage of one tenth of the member's annual salary for each of the months November through June inclusive of such school year.
Conn. Agencies Regs. § 10-183l-12