A lot of people think like this but it's not technically correct. An individual employee would actually have to earn well over €250,000 per annum before they would come anywhere near having an effective tax rate of 50% (including USC and PRSI). This report by TASC is interesting in terms of the effective tax rate at different income levels.
I don't get your point. If you are salaried and already at the higher rate of tax, then everything in rental will be at around 50%?