The Government of Canada requires plumbers to pay federal income tax at 15% on the first CAD 55,867 earned in 2026 plus provincial taxes averaging 10-15%, with mandatory CPP contributions of 5.95% up to CAD 68,500 and EI premiums of 1.63% up to CAD 63,200. Tool and uniform expenses up to CAD 1,000 can be claimed as deductions.