Tax Refund Estimator Formula

Understand the math behind the tax refund estimator. Each variable explained with a worked example.

Use the Tax Refund Estimator

Formulas Used

Refund (+) or Owed (-)

refund_or_owed = total_withheld - tax_owed

Estimated Tax

estimated_tax = tax_owed

Taxable Income

taxable_income = taxable

Variables

VariableDescriptionDefault
gross_incomeGross Income(USD)75000
total_withheldTotal Tax Withheld (YTD)(USD)12000
deductionsTotal Deductions(USD)14600
taxableDerived value= max(gross_income - deductions, 0)calculated
tax_owedDerived value= taxable <= 11600 ? taxable * 0.10 : (taxable <= 47150 ? 1160 + (taxable - 11600) * 0.12 : (taxable <= 100525 ? 5426 + (taxable - 47150) * 0.22 : 17168.5 + (taxable - 100525) * 0.24))calculated

How It Works

Tax Refund or Balance Due

Refund = Total Withheld - Tax Owed

  • Positive = you get a refund
  • Negative = you owe money

    • A large refund means you are over-withholding (giving the IRS an interest-free loan). Adjust your W-4 to keep more in each paycheck.

    Worked Example

    $75,000 income, $12,000 withheld, $14,600 standard deduction.

    gross_income = 75000total_withheld = 12000deductions = 14600
    1. 01Taxable = $75,000 - $14,600 = $60,400
    2. 02Tax = $1,160 + ($47,150-$11,600) x 12% + ($60,400-$47,150) x 22%
    3. 03= $1,160 + $4,266 + $2,915 = $8,341
    4. 04Refund = $12,000 - $8,341 = $3,659

    Ready to run the numbers?

    Open Tax Refund Estimator