Thanks Gordon,
I very much appreciate your time in writing such a detailed reply.
I think that you have confirmed what I needed which is an achievement as in fairness, I hadn't state my question very clearly.
What I really wanted confirmed is that my monthly contributions can be carried back to the previous tax year - they don't have to be "once-off" or "special" contributions which I believe is terminology that really just applies to members of occupational pension plans.
Using actual figures, I think my personal limit for 2019 is 20% of €115k (i.e. €23,000).
I've been lobbing in €2k a month since January (i.e. 10 x €2k, so €20k in total).
From a cash-flow point of view, it would suit me just to do an additional €3k before the filing deadline (say end of Oct) to reach the max for 2019.
Is this ok?
Once again - BIG THANKS. I don't have a "like" function for some reason?