Gross income split into taxable base and deductions
Add your numbers to see the visual breakdown.
From gross income to taxable income
Each amount subtracted from gross income to reach the taxable base, and what remains after each step.
Step
Amount
Running income
Gross income
75,000
75,000
Less pre-tax deductions
-5,000
70,000
Less standard or itemized deduction
-12,000
58,000
Less exemptions
-0
58,000
Taxable income
58,000
Estimates only — not financial, tax, or professional advice.
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What it calculates: Taxable Income, Total Deductions, Income Reduced By.
Updated 5 June 2026 · Transparent assumptions
$17,000 of deductions, cutting the taxed amount by 22.67%
Tax is never charged on gross income. Pre-tax deductions of $5,000 — pension, health premiums, similar payroll items — come off first, then the standard or itemised deduction of $12,000, leaving $58,000. That is the figure the bands are applied to, and it is 22.67% below what was earned.
The order matters more than it looks. Pre-tax payroll deductions reduce income before it is ever reported, so they also reduce payroll-tax liability in most systems; deductions claimed on the return reduce income tax only. Two deductions of the same size are not worth the same amount depending on where in the waterfall they sit.
$1,000 of deduction saves $220 at 22%, not $1,000
Deductions reduce the income that is taxed; credits reduce the tax itself. A $1,000 deduction for someone in a 22% band saves $220. A $1,000 credit saves $1,000 regardless of band. Confusing the two systematically overstates what a deduction achieves, and it is the most common error in tax planning conversations.
It also means the same deduction is worth different amounts to different people — $220 at 22%, $370 at 37%, and nothing at all to someone whose income already falls below the threshold. Any claim that a deduction "saves you" a headline amount is only true for someone at the top band.
You take one or the other, never both, and the larger one wins
The standard deduction is a flat amount available without records. Itemising replaces it with the sum of specific qualifying expenses — mortgage interest, state and local taxes up to any cap, charitable giving, qualifying medical costs above a floor. You take whichever is larger, and only that one.
The practical consequence is a threshold effect: until your itemised total exceeds the standard deduction, additional deductible spending saves nothing at all. A charitable gift made by someone taking the standard deduction reduces their tax by zero, which is why bunching several years of giving into one year can be worth doing.
Phase-outs, floors, caps and everything jurisdiction-specific
Many deductions are not straightforward subtractions. Medical expenses are deductible only above a percentage-of-income floor; state and local tax deductions are capped in the US; several deductions phase out entirely above income thresholds. Entering a gross figure for each will overstate the total.
Exemptions, where they exist at all, vary enormously by jurisdiction and have been eliminated in some systems. Treat this as the shape of the calculation rather than a return: the correct figures for your own position come from the current rules for your jurisdiction and filing status.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Tax rules vary by country, state, tax year, filing status, income type, deductions, and exemptions. This calculator is educational and uses the values you enter. Always verify final tax treatment with official sources or a qualified tax professional.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Tested that every deduction reduces the taxed figure and that the reported reduction percentage reconciles to the deductions entered.
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