Should earnings in Bitcoin converter to a traditional currency be treated as trading-income or non-trading income for tax purposes? Should earnings in Bitcoin converter to a traditional currency be treated as trading income or non-trading income for tax purposes (for example, in Ireland)? Reason for them being considered trading income is that the Bitcoins need to be sold at an exchange like a commodity. On the other hand, a business gains Bitcoin not necessarily through trading them for goods (say, SatoshiDice), so the other option appears viable.

Which approach should be taken into consideration when figuring out taxes?
You might not like this answer but the correct approach for figuring out taxes related to Bitcoin earnings is to ask the question to your local tax authority, in written form and get an answer that your local tax administration legally commits to.

I can speak only for France, but I assume the same kind of thing is possible anywhere. In France you can ask for a "rescrit" it is a written answer from the FISC (our tax authority). Once they gave you an answer they are legally obliged to stand by it.

There is no other correct way to account for your Bitcoin taxes than asking the people that actually can give you a definitive and legally binding answer.