Informal care, meaning taking health-related care of people in their own social network, is a topic that gets more and more attention in social science research because the pressure on people to provide informal care is rising due to ageing societies and policy changes. The developed by Broese van Groenou and de Boer (Eur J Ageing 13(3):271-279, 2016) provides a theoretical foundation to understand under what conditions a person provides informal care. We test this theoretical model by applying it to intrapersonal changes in informal care provision during the first COVID-19 lockdown in the Netherlands in Spring 2020. Data from the LISS panel from two time points, March 2020 and data from July over the period of April/May 2020, were analysed with multinominal multilevel regression analysis ( = 1270 care situations of 1014 caregivers). Our results showed that the individual determinants ( and especially ) discussed in the Informal Care Model (apart from a series of control variables) are contributing substantially to the understanding of intrapersonal changes in care provision during the first lockdown and by that, we found empirical support for the theoretical model. We conclude that on top of its original purpose to explain between-individual differences in informal caregiving using static indicators, the is also useful to explain intrapersonal changes in informal caregiving using dynamic indicators.