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REFERENCES
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`Payroll Deductions Online Calculator <https://www.canada.ca/en/revenue-agency/services/e-services/digital-services-businesses/payroll-deductions-online-calculator.html>`_

`CPP Maximum contributory earnings <https://laws-lois.justice.gc.ca/eng/acts/C-8/page-5.html#docCont>`_

`Second additional CPP contributions <https://laws-lois.justice.gc.ca/eng/acts/C-8/page-3.html#docCont>`_