To avoid irreversible climate damages, countries with different political systems must commit to reducing greenhouse gas emissions across the world. The challenge posed to federal countries participating in international climate agreements through the United Nations Framework Convention on Climate Change is that successful implementation requires buy-in from their subnational governments. However, subnational climate action may not be aligned with the political priorities of the national government and could either undermine or support commitments made through the agreement. To explore these dynamics, we review the incoherence between international commitments, national and subnational policies of Canada and the United States, relying on case studies of investments in low-carbon energy and emissions outcomes.Political and policy incoherence has flowed in both directions. Both countries have