How will the Brexit account migration impact data protection?

UPDATED: December 10, 2025

Overview:…

You do not have to complete Form 8-3-6 and you will still be able to trade if you do not complete the form.

However, if you do not complete Form 8-3-6 IBIE must continue to deduct WHT at a rate of 20% from the credit interest earned on cash balances in your account…

Multiple accounts maintained in the same name and taxpayer ID number are grouped for the purposes of applying the maximum client protection limits of $500,000 by SIPC and $29.5 million under Lloyd’s supplementary protection. However, if you hold accounts with IBKR in separate capacities (for example, an account in your name, a trust account of which you are the trustee or a beneficiary, and/or a joint account), then each account would be protected by SIPC and the supplementary protection up to the stated limits…

Depending on the legal entity your account has been migrated to due to Brexit, the bank instructions, currencies available for funding, and available funding methods may vary. Because of this, you will not want to use the old bank instructions associated with your account before Brexit migration. Fund transfers might be delayed or rejected if you use incorrect bank instructions. Please see the links below with information on how to fund your account after Brexit…