The implementation of quick response (QR) code check‐in compliance behaviour during the COVID‐19 pandemic featured in infection control strategies in several global jurisdictions, but was of particular interest in the Australian context, where it became mandated on a nationwide scale. We aimed to identify the salient beliefs people hold toward complying with the QR code check‐in using a Theory of Planned Behaviour belief‐based framework. An elicitation study using open‐ended questions (Queensland; N= 93, Mage= 4.77 years, SD= 13.62 and Victoria; N= 76, Mage= 44.92 years, SD= 11.63) and a prospective correlational study using a two‐wave online survey (Queensland; N= 290, Mage= 38.99, 46.6% female and Victoria; N= 290, Mage= 38.27, 53.4% female) were conducted. Qualitative data were coded through an iterative content analysis, while quantitative data were analysed using linear multiple regression. Behavioural, normative and control beliefs were associated with intention and behaviour in both samples. Variation in beliefs across the states also were observed. Across both samples, beliefs in positive outcomes consistently exhibited stronger associations with both intention and behaviour than the reported negative outcomes. Distinct differences emerged between the two samples in terms of regression effects. Results indicate individual experience may affect the beliefs which guide behaviour, supporting the potential efficacy of health promotion campaigns tapping into context specific beliefs and experiences if QR code check‐in is to be implemented as an infection control measure in future.