Stock trades and their taxation

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I'm a full time employee in Dublin, but also I'm interested in doing stock/share trading. Was wondering, in terms of taxation, how 'if' making profits, they can be taxed less? Is it simply as an extra income on my salary which then I pay tax for? or are there any saving schemes available under personal investments which they can be taxed less? My reference is the ISA accounts in the UK, where up to certain amount each year can be added to that account type and exempt from tax.

Thanks