Passport1 - you should phone revenue and ask them to explain. I submitted rental income returns for my self and my partner, and when the balancing statement came out, the tax bill for my partner was unexpectedly large. He phoned immediately and queried. It turns out they had made an error in their calculations. I seem to remember he had been charged an incorrect tax rate. The re-issued the statement the next day, with the bill reduced by 2000 euro. Its worth checking up.