While international mobility has developed into a major driver of population change in the European Union, people with immigrant background in the Member States continue to be placed in disadvantaged socio-economic positions. They are often hampered by a lack of host country specific skills and knowledge. Many native-born children of immigrants--the "second generation"--obtain lower levels of educational achievement than those of non-immigrant background. In consequence, migrants tend to show lower labour market activity rates and income levels compared with people without immigrant background. They also tend to be exposed to higher risks of unemployment and depend on social welfare more often. These stylized facts indicate that the provision of proper education to people with immigrant background is an important element in policies for building a more inclusive society in Europe. It may also help enhance competitiveness of the European knowledge-based economies. The purpose of this report is to provide an overview about the potential economic returns to education of migrants at the aggregate level. It covers the current state of economics research as regards returns in three different areas: economic output and growth, labour markets, and governmental budgets. The challenge in doing so is that populations with immigrant background and their economic stance are hugely diverse across Member States, and that quality empirical research findings on the topic in sum are still fairly limited, fragmented, and case specific. Hence there is little scope for meaningful cross-country comparisons and all-encompassing cost-benefit analyses in this field. [This is an Analytical Report of the European Expert Network on Economics of Education (EENEE) prepared for the European Commission.]