If you choose not to avail of the switching process, you will need to contact each company that you have a Direct Debit arrangement with and provide them with your new account details. If you choose to avail of the switching service, your existing provider will notify the companies you have a direct debit arrangement with (except for non-Republic of Ireland Direct Debit originators). However, you should still contact each company to make sure your new account details are updated on their system.