Inputs
Marginal tax estimate
Enter assumptions and click Calculate to estimate tax before and after additional income.
Summary
Click Calculate to view the estimate.
Chart
Tax before, incremental tax, and after-tax additional income
Estimate details
Marginal tax summary
| Taxable income before |
Additional income |
Income type |
Taxable amount added |
Tax before |
Tax after |
Incremental tax |
Marginal tax rate |
|---|
Assumptions and disclosure
Click Calculate to view the assumptions used.
This calculator estimates the tax impact of adding the additional income amount to the starting taxable income. The selected income type applies only to the additional income amount.
Starting taxable income is treated as ordinary taxable income for this simplified estimate unless otherwise stated. The calculator uses configurable 2026 tax brackets and income-type assumptions.
It does not model all credits, deductions, surtaxes, alternative minimum tax, CPP/EI, OAS clawback, GIS, pension splitting, RRSP deductions, medical credits, age credits, dividend credit interactions, or other personal circumstances.
Actual marginal tax rates may differ. Verify current tax rates and consult qualified professionals before making planning decisions.