Hi errigal,
Are you still confused ? I think I know where you coming from.
Its hard to believe, but Revenue are nice people really...they allow you to make a payment right up to 31 Oct 2005 into a new (or existing) PRSA , and offset it against tax you paid in 2004.
So set up the PRSA, write the cheque, PRSA provider will send you a form PRSA 1 or PRSA 2 , send it in with your 2004 tax return and wait 6 weeks for the mulla ! (Remember it was your money in the first place ...)
Pacman