As of 11 June 2014, the interest rate on the Eurosystem Deposit Facility is -0.10%. This negative rate applies to all banks’ holdings of euros in excess of the minimum reserve requirements, as well as to cash balances above a certain threshold that Eurozone governments hold in the Eurosystem (this is cash obtained through taxes or bonds issued and not yet spent), as well as to all deposits held by non-Eurosystem central banks.
What does it mean that the ECB sets a negative interest rate?
In the same way as an interest paid by the ECB to holders of euros is a net addition to holders’ income, an interest paid by the banks to the ECB for holding euros is equivalent to a tax on holders of euros.