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Disposable Income Calculator

Enter your gross income, tax rate and deductions to find your disposable income.

How it is calculated

The tool works on yearly figures. Tax is a single flat share of gross income: tax = gross × rate / 100. Disposable income is then gross − tax − other, where other is any further yearly deductions you enter (it defaults to 0 if left blank). The monthly figure is the disposable income divided by 12. All results are in dollars. The rate is one overall percentage that you choose, not a tax table, so progressive brackets, credits and country-specific rules are not applied; use your own effective rate. The extra deductions are taken off after tax, so they do not lower the taxable amount. Gross income and the rate cannot be negative, and if deductions are larger than what remains the result goes negative.

Worked example

Suppose a yearly gross income of $62,000, an effective tax rate of 22% and $3,600 a year of other deductions such as pension and insurance. Tax: 62,000 × 22 / 100 = $13,640.00. Disposable income: 62,000 − 13,640 − 3,600 = $44,760.00. Monthly: 44,760 / 12 = $3,730.00. The tool shows $44,760.00 as the yearly disposable income. That is the amount available each year for rent, food, savings and spending, before any budgeting of those costs.

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Common mistakes

  • Entering a monthly salary in the gross field. The tool treats every figure as yearly and divides by 12 at the end, so a monthly amount gives a monthly result that is then divided again; enter the annual gross.
  • Using the top marginal bracket as the rate. The flat rate should be your effective rate, meaning total tax divided by total income, which is usually lower.
  • Entering monthly deductions in the other field. It is a yearly amount, so $300 a month must be typed as 3600.
  • Counting rent, food and bills as deductions. Those are living costs paid from disposable income, and subtracting them gives discretionary income instead.
  • Entering the tax rate as a decimal such as 0.22. The field is in percent, so 0.22 is read as 0.22% and the tax almost disappears.

Sources

About this calculator

Disposable income is what's left of gross income after mandatory deductions — income tax, and typically things like social security/payroll tax and other required withholdings — are subtracted. It's distinct from discretionary income, which further subtracts essential living costs like rent and groceries; disposable income is simply gross minus taxes and deductions, the amount you actually have to spend or save.

This calculator takes your gross income, tax rate, and any other deductions and returns the disposable income figure. Households budgeting month to month, personal finance planners, and economists rely on disposable income as the base figure for calculating savings rates, debt-to-income ratios, and affordability — it's also the denominator national statistics agencies use when reporting the household savings rate.

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Comments (1)

  • Editorial team

    The extra deductions here come off after tax, which suits things like insurance or loan payments. If a deduction is taken before tax where you live, such as some pension contributions, subtract it from gross income first and enter the lower figure, otherwise the tax is overstated. The monthly line simply divides by 12. Do you count rent and insurance as deductions when you work out your own disposable income, or do you leave them out?

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