While the European Union (EU) increasingly strengthens its social integration, opposition towards this process can also be observed, here defined as ‘welfare Euroscepticism’. To better understand this newly defined policy paradigm, this article aims to explain longstanding cleavages in both social policy and EU research: socioeconomic status (SES) divides. Contrary to the literature on public support for European integration, this article argues that higher SES groups are more likely to be welfare Eurosceptics than lower SES groups. This argument and its underlying explanations are examined through a multilevel approach using European Social Survey data from 18 EU member states, using the example of a potential EU-wide minimum income scheme. First, the results demonstrate that welfare Euroscepticism is indeed more prevalent among higher SES groups than lower SES groups (measured through occupation, education, income, and employment). The results indicate robust self-interest patterns among higher SES groups that do not want to carry (perceived) financial burdens of EU social policies. The opinion patterns also emphasize the multidimensionality of attitudes towards EU policies since the SES cleavages can reverse, depending on the policy in focus. Overall, the results indicate much potential to mobilize the larger proportion of the public to support EU social policies, that is, lower SES groups. However, potential conflicts may arise when the EU expands on policies that their traditional supporters – higher SES groups – are more likely to oppose. The article also shows that welfare solidarity on the individual and the country level can mitigate such conflicts. This is because higher levels of welfare generosity and lower levels of welfare chauvinism on the individual and the country level are related to smaller SES cleavages.