The European Central Bank published a working paper examining how banks’ interest rate risk exposure shapes monetary policy transmission across fixed-rate and variable-rate lending systems. Using a model calibrated to euro area data, the authors find that a one percentage point policy rate increase reduces new lending by about one third more in a fixed-rate system. The difference arises mainly when banks have limited capital headroom and solvency concerns become relevant. In fixed-rate systems, higher funding costs compress net interest margins because income from legacy loans remains unchanged, eroding capital and forcing vulnerable banks to deleverage more sharply. Variable-rate banks reprice existing loans more quickly, which can increase profits and capital and cushion the credit contraction. Tightening also raises bank failure risk in the fixed-rate model but lowers it in the variable-rate model, with both effects concentrated among banks closest to minimum capital requirements. The analysis finds that a temporary one percentage point release of the countercyclical capital buffer narrows the difference in lending responses and initially reduces failure risk, while more gradual tightening materially lowers peak failure risk in fixed-rate systems.
European Central Bank research finds monetary tightening cuts lending one third more in fixed-rate banking systems
A European Central Bank working paper finds that a one percentage point rate increase cuts new lending about one third more in fixed-rate banking systems than in variable-rate systems. Higher funding costs erode fixed-rate banks’ margins and capital, particularly for banks near minimum capital requirements. Capital buffer releases and more gradual tightening can reduce the resulting credit and financial stability effects.