I responded to your email and provided the requested documents. Now I received an email saying my response was insufficient to resolve the issue. Why?

It is necessary for us to have current information on our clients. Expired or out-of-date documents cannot be accepted. Please make sure all documentation you submit is legible, has not expired and all proof of address documentation is less than 12 months old. It is important that you promptly respond to our requests for documentation so that the correct withholding rate is applied to your account…

Please confirm that the proof of identity you submitted was issued by the treaty country and that the proof of address relates to your address in the treaty country. A proof of address document alone is not sufficient to resolve the matter. Sometimes, customers inadvertently submit documentation for the other address. Please check the date of the proof of address document. We can only accept documents dated less than 12 months old. Also confirm you submitted a proof of identity document from the treaty country…

FATCA related FAQs involving mismatches between tax treaty country and address. See here for other FATCA related FAQ topics.

I claimed treaty benefits in one country but have an address outside that treaty country. Why did I receive an email asking for additional documentation?…

If you received a failed delivery notice:

If you receive a letter titled "Documentation Access for E-delivery return" that states "a recent attempt to deliver shareholder materials to the e-mail address you have on file as of record with your broker, for this purpose, has failed", please first confirm that the email address on your IBKR account is current. If incorrect, update your email address through Client Portal (see…