The Canada Revenue Agency (CRA) has published a September 1, 2014 version of the Ontario payroll tables to incorporate proposed increases to personal income tax rates tabled in the Ontario budget on July 14, 2014. As the proposed changes are retroactive to January 1, 2014, the revised tables will reflect the necessary prorated tax rates to allow employers to withhold the correct additional amounts from employees between September and the final pay of 2014. The changes to the tables apply to employees who earn more than $150,000 in 2014. 

KB 45525 "Ontario payroll tax table changes as of September 1, 2014"  has the hotfix to update the Ontario income tax rates