Michael Noonan (Limerick City, Fine Gael) | Oireachtas source

I will give the Deputy further information. Revenue incorrectly replied to a small number of property owners in the Longboat Quay complex confirming that a reduction in valuation was possible. This was an error and the letter should not have been issued. Revenue only realised the error when further letters were received from a large number of residents of the complex seeking similar treatment. On discovering the error, Revenue immediately wrote to the original persons involved apologising for the incorrect information. Revenue also wrote to the other property owners who were seeking similar reductions to confirm that the valuations could not be reduced. Revenue has confirmed that, as standard practice where an error is made or taxpayers are inadvertently provided with incorrect information, contact is made with all affected parties as soon as the mistake comes to light to apologise in the first instance and to ensure the correct information is quickly provided and clarified as necessary.

See this speech in context