The UK Care Act (2014) places a duty on Local Authorities to meet the eligible needs of carers in the form of personal budgets (PBs). PBs are positioned as a lever that will promote carer wellbeing. In the context of the Care Act wellbeing is conceptualised broadly to include economic and social participation. However, despite the 5.4 million adult carers in England, little is known about the efficacy of PBs on promoting carer wellbeing, particularly as PBs have been central to the personalisation agenda reforming adult social care in recent years. This research sought to explore this knowledge gap using a mixed-methods design built around three phases.