The disparate treatment of capital and labor reflects one of globalization’s central asymmetries: the law often allows financial capital, but not people, to move freely across borders. Yet scholars have largely neglected the intersection of these two regimes, the legal restrictions on migrants’ capital, particularly when the migrants themselves are deemed illegal. These restrictions on migrants’ capital abound even while migratory capital generally faces few such restrictions. As such, capital controls may operate as migrant controls. This Article canvasses established and emerging examples of capital controls as migrant controls and the pressing legal questions these controls raise. Capital is guarded when remittances are taxed, particularly when the taxation is explicitly conditioned on immigration status. Capital is expelled when capital receipts, such as Social Security benefits, are made contingent on departure and non-residency. And capital is marginalized when financial laws require particular identity and immigration documents on penalty of exclusion from key financial services. As I describe, such taxation, receipt contingencies, and identity requirements often distinguish on the basis of immigration status and implicate core questions in constitutional and immigration law. These questions include the scope of traditional state powers such as taxation; how such controls create unconstitutional choices and conditions; and how statutory and administrative ambiguities in banking law may marginalize migrants. More generally, these controls contribute to our understanding of who—Congress, federal agencies, municipalities and states, or social movements outside the law—controls, and who may legally control, American migration.