Ontario Surtax & Health Premium Explained: Why Your Payslip Looks Wrong

Because it isn't optional and it isn't a separate tax bracket, it's a tax on your Ontario tax. Once your basic Ontario tax payable (after the Ontario Basic Personal Amount credit) crosses $5,818, the CRA and your employer's payroll system apply a 20% surtax on the amount above that. Cross $7,307 of Ontario tax and a second 36% layer stacks on top of the first, meaning your marginal rate on Ontario tax above that point is effectively 56%. Nobody sees this on a simple bracket table because it isn't a bracket, it's a surcharge applied after your provincial tax is already calculated, which is exactly why it feels like it appeared from nowhere.

For a straightforward T4 salary with no other credits, the first surtax tier starts biting once your gross salary is around $95,000, and the second, steeper 56%-marginal tier kicks in around $110,000 to $111,000. Below roughly $95,000, your Ontario tax owed hasn't yet crossed the $5,818 threshold, so the surtax line on your pay stub reads $0. Once you're earning solidly above $110,000, expect it to show up every single pay period.

No. Ontario's OHIP-covered healthcare is publicly funded and you don't pay a premium to be covered by it. The Ontario Health Premium is a separate income-tested annual charge, collected through the tax system alongside your provincial tax, that funds general provincial revenue rather than a specific insurance product. It has nothing to do with private extended health benefits your employer might also offer, and you can't opt out of it by declining employer coverage.

Because the Ontario government has never indexed it to inflation since its introduction in 2004. The plateaus and ramp points ($20,000, $36,000, $48,000, $72,000, $200,000 and so on) are exactly the same dollar figures today as they were over two decades ago. In practical terms, that means more people drift into the higher plateaus every year purely through ordinary salary growth, without any policy change actually happening, a phenomenon sometimes called bracket creep even though this is a premium table, not a formal tax bracket.

CPP2 is a genuinely new second layer of Canada Pension Plan contributions, introduced in 2024 as part of the CPP enhancement, and it is separate from base CPP. Base CPP charges 5.95% on earnings between a $3,500 basic exemption and the Year's Maximum Pensionable Earnings (YMPE), $74,600 for 2026, capping the employee contribution at $4,230.45. CPP2 then charges an additional 4.00% on earnings between that $74,600 YMPE and a second, higher ceiling called the Year's Additional Maximum Pensionable Earnings (YAMPE), $85,000 for 2026, capping CPP2 at $416.00. If your salary is under roughly $75,000 you'll never see a CPP2 line; above that, you will, and it stacks on top of base CPP rather than replacing part of it.

Yes, and this is why your take-home pay can noticeably increase later in the year if you earn well above the caps. Base CPP stops being deducted once you've contributed $4,230.45 for the year (reached at $74,600 of cumulative earnings), CPP2 stops at $416.00 (reached at $85,000), and EI stops at $1,123.07 (reached at $68,900 of insurable earnings). Once all three caps are hit, typically mid-to-late in the calendar year for a salary comfortably above $85,000, your pay stub drops those three deduction lines entirely until the new year resets them.

Generally no, your provincial tax obligation follows your province of residence on December 31, not your employer's head office. If you live in Ontario and work remotely, both apply to you in full. If you live in, say, Alberta or Quebec but your employer is headquartered in Toronto, you'd typically be taxed under your home province's rules instead, which have entirely different brackets and no equivalent surtax or Health Premium structure. This calculator and article are scoped to Ontario residents specifically; don't apply these figures if you're filing in another province.