It uses CRA payroll deduction formulas with current federal and provincial tables: basic personal amounts, CPP/QPP and CPP2/QPP2 with the prorated exemption and deductible enhancement amounts, EI, QPIP for Quebec, and province-specific items like Ontario surtax and health premium where they apply. It is the same tax engine deezbills uses inside the product. Your real paycheques can still differ with employer-specific deductions like benefits, pension plans, union dues, bonuses, or custom TD1 amounts.

CPP, CPP2, and EI each have an annual maximum. Early in the year a slice of every paycheque goes to them; once you hit a maximum, that slice stops coming off and your take-home rises for the rest of the year. Most calculators average this away and quietly overstate your January paycheque. This one shows each step and the month it happens.

Yes. Quebec replaces CPP with QPP (including the QPP2 second tier), adds QPIP for parental insurance, and pays a lower EI rate because QPIP covers parental benefits. Pick Quebec and the breakdown switches to QPP, QPP2, EI, and QPIP automatically.

As personal annual contributions, not payroll deductions: your paycheques stay exactly the same, and the calculator estimates what could come back when you file, because both contributions lower your taxable income. It assumes you have the contribution room: RRSP room depends on your prior-year income and carry-forward (check your CRA notice of assessment), and FHSA room is the annual limit plus up to one year of carry-forward once the account is open.

Your average tax rate is the share of your whole income that goes to income tax. Your marginal rate is what the next dollar you earn is taxed at, and it is always the higher number because Canadian brackets are progressive. The marginal rate is the one to look at when weighing a raise, a bonus, or how much an RRSP contribution saves you.

No. There is no account, the numbers you type are not stored, and the calculation happens against the tax formulas alone. If you want your real paycheques planned automatically every payday, that is what deezbills the product does, and it comes with a free trial.