Are you sure about that jpd? My accountant has asked me to provide them!
As I understand it, you still have to send them in, even though DIRT is deducted at source.
Revenue wants all taxpayers to move to electronic tax returns, and does not want pieces of paper submitted any more.
However, they could send out a query asking you / accountant to produce same within quite a short space of time, so that's one reason why the accountant asks for a cert when preparing your return.