Here in BC the $30 per tonne carbon tax amounts to 6.67 cents per liter of gas.  A $50 per tonne levy would be about 11 cents extra per liter.

For natural gas it's about $1.49 per gigajoule.  I just received my September gas bill today and the carbon tax was $6.70 for 4.5 gigajoules of consumption.  The gas cost itself was $11.90 for 4.5 gigajoules so the carbon tax is roughly 50% of the gas cost.  At $50 per tonne the carbon levy would be about $2.50 per gigajoule, which is roughly the same as the current gas cost alone.

Those are the two major fossil fuel uses for individuals, but in addition there would be indirect increased costs for anything you purchase that has fossil fuel as part of its manufacture....in other words...virtually everything except imported goods from countries with no carbon tax.