In the literature, there is a general assumption that teachers teach more effectively during team teaching compared with solo teaching. Although effective teaching behaviour is imperative for students' academic outcomes, only scarce research exists on this difference. Therefore, it remains mainly unknown whether teachers teach more effectively during team teaching compared with solo teaching. This study aims to address this gap by providing a general picture of the differences in teachers' self-reported effective teaching behaviour during solo teaching and team teaching. To achieve this, a large-scale cross-sectional survey study was performed among teachers (n = 453) in compulsory education. The SET questionnaire was administered to teachers who team teach. Overall, results show that teachers reported to be more capable of displaying effective teaching behaviour during team teaching compared with solo teaching. Furthermore, results show a positive relationship between teachers' self-reported effective teaching behaviour and education type, teaching experience, and with team teaching percentage.