Taxation of US based Share trades

I have been trading in US shares via a US based online brokerage for some time. Initially I transferred money to the dollar account. In addition to money made and lost on the share trades I lost money because of the decline in the value of the dollar vs the euro.

How do I report my gains/losses for CGT purposes? Do I factor in the changes in the dollar/euro rate on each trade or do I only account for the dollar/euro change when I bring the money back to and Irish account?

You need to convert every trade, i.e. buy and sell, to euro. See the link for examples.

http://www.revenue.ie/leaflets/cgt1.pdf