A share split does not impact on you financially you, so there's nothing to worry about or celebrate there, and there will be no change in your tax status.
So you had 20 shares at, for example, a share price of €10. You now have 40 shares (a 2-for-1 split) at a share price of €5.
RyanAir did a 2-for-1 split last year, McInerney did a 5-for-1 split.
Share splits are very frequent in the US, and seem to be becoming more common here.
A lot of what drives them is a psychological factor. A share trading at $80 per share sounds expensive compared with one trading at $20. The company does a 4-dor-1 split... now their shares sound cheaper, $20, and are more desirable to investors.
As regards selling the shares at a loss, you only pay Capital Gains Tax on a gain, not a loss, therefore you will not be liable. However, if sometime in the future you make a gain on shares, you can use this loss to offset your CGT liability. For more information on this, check out
www.revenue.ie