When the 21% VAT is added on to something you buy online, should it be added to the value of the product only or the total value of the product plus the P&P?
Just to note ... if you buy from a retailer in another EU country that does not do over a certain level of business into Ireland (c. €50K p.a.? - after which they must charge Irish VAT) you can pay the retailer's local rate of VAT instead which may be lower.