Let's forget about clandestine payments for a moment (in any case they are trickier than the media seems to think, and company accounts are in any case transparent up here).
So, if people start getting paid in bitcoins, what are the Finnish tax authorities going to do? Presumably they're going to demand that
- Bitcoin amounts earned are declared along with the euro to bitcoin rate on the date of payment
- Income taxes are paid on that amount
- When bitcoins are converted to euros, any profits are taxed at capital gains rates
- And alternately, any losses can be offset against other tax payments
The only feasible solution I can see is for governments to move away from income tax and capital gains taxes, to a purely "value added tax" or "sales tax" approach, with different rates for essential goods such as staple foods (sales tax free?) and 50 foot yachts (50% 90%).