I think even the Revenue themselves are confused about this, because I have done the following for the past few years and some years they have calculated my tax incorrectly and have needed me to explain how it works. I might be wrong, but they are not telling me that I am so I keep filling it in the same way.
My understanding, with the usual provisio that I am not an expert and am open to correction is that...
Section 507 b should have my contributions which my employer deducts from my salary... no relief due...
Section 507 c should have the employer contributions, which also have no relief due. This amount is also them entered into section 218 a (Taxable benefits not taxed at source... PRSAs)
Section 507 d would have PRSA contribs not handled by the employer.
This is the approach that makes sense to me based on the questions on the form, as it seems to me that Revenue would want to know the total amount going into the PRSA.
EDIT: Of course this is for a PRSA... whereas the first poster was speaking of a DB scheme, which may well be different...
Ix.