I think that has to be debated. It could be a multiple of the allowable amount for individuals, that is $5,000 or $10,000 per business. However, this amount should not be too high, but high enough to allow businesses to say that they have acted like good corporate citizens, that they have contributed to the Chief Electoral Officer's trust fund or, in some other way, to the various political parties.
On May 31st, 2006. See this statement in context.