We document that the reallocation of central bank reserves towards banks with higher liquidity needs fosters credit supply. Exploiting the ECB's tiered reserve remuneration system for identification, we show that this system encouraged banks with low reserve holdings to obtain more reserves through the money market. Concomitantly, these banks reduced their securities holdings and extended more credit. We estimate that the reallocation of one euro of reserves towards banks with ex ante low reserve holdings resulted in an increase in credit supply of about 15 cents.

Exploiting confidential data from the euro area, we show that sound banks pass negative rates on to their corporate depositors and that pass-through is not impaired when policy rates move into negative territory. We do not observe a contraction in deposits, reflecting a general increase in corporate liquidity during the sample period. When their banks charge negative rates on deposits, firms with ex ante high liquidity invest more than comparable firms that are not charged negative rates and increase their liquid holdings less. These results challenge the common view that conventional monetary policy becomes ineffective at the zero lower bound.