During the COVID-19 pandemic, teachers had to face different teaching and assessment challenges. This study aims to analyse the relationship between the assessment practices of teachers (related to their assessment conceptions) with their self-perceived level of teachers' digital competence (TDC) and their received TDC and assessment training courses. For this, the authors applied an online questionnaire that analysed the case of secondary school teachers in Catalonia (Spain) (n = 278). Results show that participating teachers who have the highest self-perception of TDC are the ones who perceive themselves as integrating mainly formative assessment. Significant correlations were also found between recent teacher training and the kind of assessment practices carried out by participants. Official certification of TDC also has a statistically significant association with different assessment characteristics and purposes. Finally, the implications of these findings for pre-service and in-service teacher training are discussed, both regarding the TDC and the assessment competence.