That's right. But the solution to it is not to not tax them. That still leaves them with a low income. The solution is to pay them properly. The granting councils have a level of pay so post-docs are paid out of grants, and it's remarkably low. I think, as Mr. Viau said, it's sometimes less than a PhD student will get. That's the problem. Not taxing them was an attempt to create some benefit, given how badly they're paid. But we have to address the real problem, that if we want to retain them, if we want to attract and keep top-notch post-docs, then we have to pay them appropriately.
On October 21st, 2010. See this statement in context.