Federal banking regulators' proposed update to Basel III capital rules omits private mortgage insurance as a risk-mitigant factor in determining capital requirements for residential mortgages held on bank balance sheets. Industry experts argue this omission overstates effective credit risk and results in higher capital charges than the actual loss exposure warrants, effectively penalizing banks that use PMI as a risk-transfer tool.
For Armada's traditional repo desk, the relevance is second-order but real. Higher mortgage risk weights without PMI credit consume more bank regulatory capital, reducing the balance-sheet capacity of bank and dealer counterparties to engage in repo and other financing activities. If finalized as proposed, dealers subject to the revised Basel III framework may reduce their Treasury and agency repo footprint or widen spreads to recover capital costs, affecting Armada's counterparty pricing and availability.