Ah - I see. Well you can check the Revenue website for income tax exemption limits, tax bands and rates etc. as they apply now to see what would be the case if you were retiring today on a specific retirement income. For example a married couple over 65 can earn €40K p.a. without paying any tax.
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Don't forget that some (or all?) pensions also allow you to take up to 25% of the accumulated fund as a tax free lump sum at retirement.