Really Blue Rose thats an awful lot to put away if you have lots of right offs. I calculated how much my top line would be for a full year at capacity, then found out what 15% of it was. In the 6 years that I have filed my taxes I have had 2 years where I have made within 2000 of my maximum potential income and my tax and cpp combined have been less than what that comes to. I end up paying at most 7.5%. I always air on the side of causion, prepare for the worse case scenario with everything so I think that 7.5-8% should be more than adequate.