CPP calculation For and employee or employerĬPP contribution = ( The smallest number between: Gross revenue and: Year's maximum pensionable earnings YMPE in 2020 - Basic exemption) x (Employee or Employer rate / 100) Exemple: The CPP should be calculated on gross income, not the after-tax income. The general contribution rate as changed in 2020 (raise of 0.15% for both employee and employer).