One aspect of Ontario's rather large structural deficit is how it compares with other provinces. If the Wynne Ontario budget passed for $12.5 billion versus a population of 13.54 million (Wikipedia), that's a budget deficit of $923.19 per person. Ontario's GDP at the end of 2013 was 692.4 billion according to Ontario's ministry of finance or $51,137.37 per person.
Quebec's 2014-2015 budget deficit is $3.7 billion according to this National Post article, although I'm not positive that refers to the 2014-2015 year. Quebec's population is 8.155 billion according to Wikipedia which produces a budget deficit of only $453.71, considerably lower than Ontario's. I'm trying to get an up to date GDP number for Quebec, but even adjusting for GDP, I still think that Ontario's is considerably higher. Not adjusting for GDP it is more than twice as high per person.