Does entering a higher tax bracket tax all your income at that rate?
Progressive income tax commonly applies different rates to different slices of taxable income. The marginal rate and the average burden are different measurements, and both need a clearly defined income base.
Income tax calculator →Separate marginal and effective rates
A marginal rate describes the tax rate on an additional unit of taxable income within the relevant band. An effective rate divides total tax by a stated income amount. Dividing by gross income instead of taxable income changes that percentage, so two published effective rates are not comparable until their denominators are clear. Deductions can create a substantial difference between those bases.
Use a fictional two-band system
For teaching purposes only, suppose the first 10,000 of taxable income is taxed at 10% and the excess at 20%. Tax on 12,000 is 10,000 × 10% + 2,000 × 20% = 1,400. The effective rate on taxable income is about 11.67%, not 20%. Another 100 of income creates 20 of additional tax under these assumptions. These invented bands are not a current tax schedule for any country.
Check the real calculation scope
Credits, income-related allowances and benefit withdrawal can change the effect of additional income. Select a supported country, verify the displayed tax year, then check whether the calculator expects gross or already-taxable income. Read its exclusions before treating the result as all taxes or take-home pay. A mathematical illustration of progressive bands cannot establish your filing status, residence or entitlement to deductions.
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