The notion of social solidarity involves formal and informal practices, with various levels of institutionalisation. It builds on normative assumptions and discourses of reciprocal expectations of mutual help, on (perceived) ideas of sameness or neediness in relation to, among other, class, ethnicity, and/or gender and on notions of deservingness that are entangled in such ideas. In this contribution, we discuss how the intersection between institutionalised social solidarity in European nation-states and notions of deservingness informs who is seen as worthy of being part of welfare arrangements. Where ideas of solidarity and deservingness intertwine with legal categorisations of belonging, the results are exclusionary policies that often restrict migrants’ access to national welfare policies, and hence meaningful societal participation. Furthermore, we discuss migrants’ experiences with expressions of solidarity beyond the national realm, exploring how ideas about migrants’ deservingness become linked to their economic usefulness within the European (integration) project.