Interactive Brokers Ireland Limited (IBIE) must apply Irish withholding tax of 20% on credit interest paid to certain clients, including natural persons. However, you may be able to reclaim some or all of the tax withheld, if you are resident in a country with a Double Taxation Treaty (DTT) with Ireland, which includes all EEA countries.
To reclaim withholding tax, you must complete Form IC7. For details on how to complete Form IC7, please review Knowledge Base article Irish Tax Withholding Reclaim Process.