Effective STEM teaching relies on teachers’ self-efficacy, impacting teaching approaches (Bandura, 1977). Despite the importance of enhancing teachers’ confidence, a research gap exists in understanding teachers’ perceptions across Australia. Previous research established a positive correlation between teacher confidence and instructional performance (Nadelson et al., 2012; Margot & Kettler, 2019). This study examined 87 primary teachers across Australian jurisdictions, investigating their self-efficacy and teaching outcome expectancy in teaching STEM using the Teacher Efficacy and Attitudes toward STEM (T-STEM), a survey that provides insights into educators’ self-efficacy/beliefs and teaching outcome expectancy (Friday Institute for Educational Innovation, 2012). The findings revealed variations in participant responses across career stage (i.e. Graduate to Lead), across all four STEM disciplines. The findings demonstrated varied confidence levels when teaching Science, Technology, Engineering and Mathematics as standalone subjects, compared to implementing STEM as a transdisciplinary approach (English, 2016; Kelley & Knowles, 2016). The study’s findings also revealed several distinct pedagogical approaches employed by teachers when delivering STEM instruction (Radloff & Guzey, 2016). Analysis of teaching outcome expectancy showed variations in beliefs about the impact of effective teaching on student achievement (Siregar et al., 2019). This presentation will include a discussion of the study’s findings, and their implications for the current STEM landscape across Australia.