T4127 Payroll Deductions Formulas
The Payroll Deductions Formula Guide (T4127), effective January 1, 2026, is now available. Please note that we provide an electronic service that notifies you of any changes for payroll deductions. To subscribe, go to canada.ca/cra-email-lists.
Topics for T4127
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Business Information
If you cannot find an answer to a question about your payroll requirements or need assistance using the calculator, call Business Enquiries at 1-800-959-5525.