The term “ancillary functions” in the context of education refers to the tasks that teachers carry out that are not explicitly related to classroom teaching, such as serving as subject coordinators, club advisers, sports coaches, coordinators of both co-curricular and extracurricular activities, and community engagement services. Teachers still need to perform actual teaching, yet these services are vital for the school’s daily operations. Along this line, this study determined the level of teachers’ ancillary functions and level of teachers’ performance in a small-sized School Division in Norther Negros Occidental during the School Year 2023-2024. Data needed for this descriptive paper was collected from 66 public elementary school teachers using a self-made survey questionnaire that has passed the stringent tests of Validity and reliability. Data gathered revealed that teachers’ ancillary functions are high for teaching-related (M=4.0382; SD=0.32875) and administrative assignments (M=3.8644; SD=0.40228). Additionally, it was found that there was no significant relationship between teachers’ ancillary functions and their performance. The study calls for the use of differentiated instructions and requires School Heads to practice transparency and fairness in the distribution of ancillary workload to teachers. Keywords: Teachers’ ancillary functions, teaching performance, teaching-related assignments, administrative assignments, Negros Occidental, Philippines.