Savings provider Nationwide UK Ireland has apologised to customers after they were incorrectly asked to provide personal information.
The company said it informed the Data Protection Commissioner when it became aware of the mistake.
Last month Nationwide UK Ireland's Head Office in Britain wrote to customers here requesting information about their tax residency.
They were asked whether they were tax resident in the UK or elsewhere and were asked to provide their PPS number as well as a certified copy of supporting documentation such as a passport, certificate of residency or national ID card.
In the past few days however, customers who received that original letter have been written to once again.
The letter outlines how the original communication should only have been sent to customers in the UK and not in Ireland and goes on to say "...don't worry, we won't use or share any information you've sent us".
It is not yet clear how many customers were written to and how many replied with their personal information.
Nationwide UK Ireland said today that it will destroy any information that has been received.
The company said it has informed the Data Protection Commissioner of the mistake and has been told that the incident does not represent a data breach.
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