According to Indiana law, in order for part-time and substitute teachers to be members of the fund, they must:
- Be certified by the Indiana State Board of Education (IC 5-10.4-4-1(a)(1); 35-14-4-1; and
- Have obtained at least an Associates Degree (IC 5-10.4-4-1(a)); and
- Teach at least 120 days in a year, or at least 60 days in each of two years (35-14-4-1; IC 5-10.4-4-2).
Contributions should not be collected for substitute teachers who do not meet the criteria above. Once qualified substitute teachers teach the required number of days, they become members of the fund.
The substitute teachers and their employers must then begin making contributions (IC 5-10.4-4-11; IC 5-10.4-7-7; IC 5-10.4-7-12). Retroactive payments are not required for service prior to the teacher retiring before the required number of days. According to the rules set forth in Indiana Code 5-10.4-4-6, teachers may purchase additional service credit for substitute teaching service prior to becoming a member of the fund.