After more than a year of COVID-19 crisis and the school closures that followedall around the world, the concerns about lower learning growth and exacerbatedinequalities are larger than ever. In this paper, we use unique data to analyse how one full year of COVID-19 crisis in Dutch primary education has affected learning growth and pre-existing inequalities. We draw on a dataset that includes around 330,000 Dutch primary school students from about 1,600 schools, with standardized test scores for reading, spelling and mathematics, as well as rich (family) background information of the students. The results show a lower learning growth over a full year for all three domains, varying from 0.06 standard deviations for spelling to 0.12 for maths...