Contribution changes (what you will pay):

All workers aged 60 to 65 will be required to make CPP contributions—even if they are receiving a CPP or QPP retirement pension.
Workers who are 65 to 70 years of age and who are receiving a CPP or QPP retirement pension will be required to contribute unless they have elected to stop their CPP contributions. To elect to stop contributing to the CPP, workers will have to be at least 65 years of age and do the following:
Employees (who may also have self-employment income) will have to complete Form CPT30, Election to Stop Contributing to the Canada Pension Plan, or Revocation of a Prior Election and give a copy to their employer. In addition, employees should send the original to the Canada Revenue Agency (CRA). The election will take effect on the first day of the month after the employee gives the form to their employer.
Note: The CRA has been accepting Form CPT30 since December 1, 2011, but only from those employees who as of December 31, 2011 are at least 65 years of age and in receipt of a CPP or QPP retirement pension.
Self-employed workers will have to complete Schedule 8, CPP Contributions on Self-Employment and Other Earnings, when they file their income tax and benefit return for 2012 or any subsequent year. The election will be effective on the first day of the month referred to in Schedule 8.