O'Toole had a reasonable idea for tax adjustments.  1% off the top bracket (since it is over 50% in many provinces now) and 1% off the bottom bracket.  Then, another 1% off each when the budget is balanced.  The latter would involve reducing spending, which the Liberals have yet to show a plan for or even interest.  For the Liberals to cut taxes, they would either be betting the farm on 3+% GDP growth with the risk of even deeper deficits if assumptions are too optimistic, or shifting the tax burden around, such as canceling tax credits on the same folks who received the income tax break, such that average take-home pay wouldn't change. 

Also, bring back the promised small business tax cuts that were cancelled, to offset higher payroll and carbon taxes.

It should go without saying that capital gains and dividend tax credits should stay put.