Money coming from a DC pension (after taking the 25% lump sum - tax free up to €200,000), can be used as Steven has outlined above. If the 75% is invested into an ARF or an Annuity, the resulting annual income is potentially liable to tax (PAYE + USC). But that depends on the total income number. The resulting income (say 4% of the fund value each year) might be liable to some (or none) PAYE , at 20% or 40%, after allowing for tax credits.
However if you draw down all the 75% as income in one year then you will certainly suffer a significant tax hit. So that makes no sense.
The basic assumption behind building up a pension fund (and getting significant tax reliefs along the way) is that the accumulated fund will be used to provide an income in retirement. If the 75% is invested into an ARF, the fund remaining on death in retirement passes initially to a surviving spouse (and continues as an ARF). On the death of the spouse, any residual fund remaining can pass to children ( but liable to tax).