Speaking from experience, I would echo the comments made by Persius and Lightning. I opened an account with BGP and overlooked to return the withholding tax forms before my savings matured in July 25. I'm now in the process of trying to reclaim it directly, and it's not without difficulty. I sent the forms with an accompanying letter, in Portuguese, to the Revenue in Portugal in January, and I haven't had as much as an acknowledgment from them. But then Revenue Ireland still haven't returned the forms I sent to them from the Latvian Bank, sent around the same time. I note that BGP levy 28% WHT on their savings, and one can only claim 15% back against the 33% WHT here in Ireland. So, if I'm not mistaken, unless one can claim the remaining 13% from Portugal, the total WHT on one's savings would be 46%? Had I sent the tax forms back to Raisin, would the WHT been fully reimbursed? Perhaps someone here who has invested with BGP can confirm?