Tax 2011-sole trader- require advice

If my net profit for 2011 is approx €30k, what will my tax liability be approximately. If anyone could advise how I come to the figure, I can complete books to profit and loss stage.( not flawlessly) I have an accountant to complete for me, however I want to know in advance.
Thanks in advance

Impossible to say without more information, starting with:
- Are you a sole trader or a company?

However by now your accountant will no doubt have filled you in.