Hi NoRegrets. In fact I can make voluntary contributions if I left socially insured employment in the EU in the last 5 years and having the minimum of (I think) 520 reckonable contributions in Ireland. I already have that much in writing (twice, once by email and now in a letter). My time in Germany in socially insured employment is counted as if I were still in socially insured employment in Ireland so to speak. So voluntary contributions are definitely possible in a case like mine. I have already been accepted as a voluntary contributor based on these facts and having submitted VC1 with a copy of my German social insurance record (as requested by the department in the initial email response to my query).
If rental income PRSI contributions cannot be made at class S as a non resident, then this is a good thing as it would be well over the €500 minimum contribution I'd likely be assessed for as a simple voluntary contributor. Clearly I want to pay as little as possible for my reckonable contributions and as we are likely to be under a total contributions approach by the time I reach 67 or 68 then it makes sense to start paying in now already and not waiting the 5 years out. Under a TCA I guess each €500 contribution would be worth roughly 1/40 of the contributory pension so you'd get all your contributions back in 18 months and even if I die prematurely, it would entitle my wife to a far better survivor's pension than in Germany.
I'm more curious about the annuity + AMRF "trick" I mentioned above but on rereading my own post I see an error. I don't need the annuity to death to claim the PAYE tax credit. The DSP pension entitles me to that credit already once I reach pensionable age. I just need to use the AMRF income to allow me to claim it from age 50 already.
If the PRSI paid on the AMRF income (taken monthly) entitles one to 52 reckonable contributions then I could cease voluntary contributions in 7 years already and still receive those reckonable contributions. I'd like to hear if anyone else can confirm that (sub €500) PRSI paid on AMRF income (taken monthly) does indeed result in 52 reckonable contributions appearing on your record.