Per diem Substitute Teachers Needed Substitutes are valued members of our community that we rely heavily on to ensure your student receives uninterrupted learning. We are looking for a few more people to join our substitute teacher pool. If you or a friend are interested in learning more about becoming a substitute at IACS please fill out the availability form. Half day and full day subbing opportunities are available. IACS pays $25 per hour up to $100 per day maximum.