La. Consolidated Public Retirement § 11:901.21
The eligibility for, and also the amount of the supplementary benefit for teachers retired prior to July 1, 1948, shall be determined as follows:
No teacher now retired who is entitled to receive from the teachers' retirement system of Louisiana, or the teachers' retirement fund of Orleans Parish, a benefit equal to, or in excess of the amount of twelve hundred dollars per annum, shall be entitled to receive any supplementary benefit under the provisions of this Part. For a retirant whose benefit provided by either of the teachers' retirement systems just mentioned is less than the amount of twelve hundred dollars per annum, the following plan or formula shall determine not only whether or not the retirant shall be entitled to a supplementary benefit, but also the amount of the benefit, if any, provided by this Part:
Formula:
Three per cent of the average salary received for the last five years of accredited service multiplied by the number of years of accredited service less the amount of the benefit allowed under Parts III, V, or VII of this Chapter, provided that the regular benefit plus the supplementary benefit provided by this Part shall not exceed the amount of the average salary for the last five years of accredited service. In no case shall the total benefit exceed twelve hundred dollars per annum.
La. Consolidated Public Retirement § 11:901.21