This paper investigates how unrealized losses on banks’ amortized cost securities affect monetary policy transmission to bank lending in the euro area. Leveraging the sharp increase in interest rates between 2022 and 2023 and using granular supervisory data on security holdings and loan-level credit register data, we show that a one percentage point increase in the share of unrealized losses on amortized cost securities amplifies the contractionary effect of monetary tightening on lending supply by approximately one percentage point. This effect is more pronounced for weakly capitalized and less liquid banks, and those relying more on uninsured deposits. We further document that banks respond to growing unrealized losses by raising capital and passing through interest rate increases to depositors via higher deposit betas. Importantly, banks that employ interest rate hedging strategies can fully offset the negative impact of unrealized losses on credit supply. The contraction in lending is particularly severe for smaller borrowing firms, highlighting the uneven economic consequences of hidden balance sheet fragilities during a tightening cycle.
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