New from CRA
https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/payroll/completing-filing-information-returns/t4-information-employers/t4-slip.html?utm_source=payroll_deductions&utm_medium=eml
Box 45 – Employer-offered dental benefits Slips filed for calendar year 2023 and after
Box 16A – Employee’s second CPP contributions (CPP2) Slips filed for calendar year 2024 and after
Box 17A – Employee’s second QPP contributions (QPP2) Slips filed for calendar year 2024 and after