If I am self-employed with an income of 40k and 45 years old, can I open a PRSA and put 30k in it as my contribution for 2022, 2023 and 2024 for example? Is there a limit on the number of future years I could cover? Would there be pitfalls to that approach? In terms of tax, is it then just a question of putting a contribution of 10k per year on my return?