I think you need to be with the employer for a year in the foreign country before transferring to Ireland to qualify for SARP. That was the case 3 years ago when I became eligible, not sure if it still is.
@timulukus I moved from NYC to Dublin, and despite being eligible for SARP that reduced my income taxes I still found the tax rate more punitive than the US, especially when factoring in the cost of living was not that much cheaper than NYC.
The other major gripe with the taxation system is wealth accumulation via investments. CGT rates/exemptions and deemed disposals are incredibly uncompetitive vs the US and the UK. The tax benefits here are really just in pension investment which is not ideal for people that are not intending to retire in Ireland and also that cash is locked away.
I would pretty much estimate that if you take your current salary and convert it to Euro that is the base salary you should expect to live comfortably. That will take into account the higher tax rate and the slightly cheaper cost of living. This will obviously vary based on where you are relocating from in the States? New York to Dublin is on par, but St Louis to Dublin is the equivalent of St Louis to New York i.e. you would expect a higher salary.
Ireland is an amazing country and offers a great lifestyle, but so does the US!