Wisconsin State Income Tax Calculator

Data Source and Methodology

Authoritative data: Wisconsin Department of Revenue, “Individual Income Tax Rates and Brackets” (Tax Years 2023–2024). See: Official WI DOR Tax Rates.

All brackets and rates used here reflect those published by the Wisconsin Department of Revenue for the selected year.

Tutti i calcoli si basano rigorosamente sulle formule e sui dati forniti da questa fonte.

The Formula Explained

Tax = \sum_{i=1}^{n} \left( r_i \cdot \max\{0,\ \min(I,\ U_i) - L_i \} \right)
        

\text{Marginal Rate} = r_k \quad \text{for the bracket } k \text{ in which } I \text{ falls}

\text{Effective Rate} = \dfrac{\text{Tax}}{I} \quad (\text{defined as } 0 \text{ if } I=0)
        

\text{Net Tax} = \max\left(0,\ \text{Tax} - \text{Credits}\right), \qquad
\text{After-Tax Income} = I - \text{Net Tax}
        

Glossary of Inputs and Outputs

• Filing status: Your filing category (Single, Married Filing Jointly, Married Filing Separately, Head of Household). Brackets differ by status.
• Tax year: The year whose official Wisconsin brackets are applied.
• Wisconsin taxable income: Income after Wisconsin-specific additions, subtractions, and deductions.
• Estimated credits: Nonrefundable Wisconsin credits you plan to claim; subtracted from gross tax.
• Gross WI tax: Tax calculated from brackets before credits.
• Net WI tax: Gross tax minus credits (not below $0).
• Marginal rate: The rate that applies to your last dollar of taxable income.
• Effective rate: Net WI tax divided by taxable income.
• After-tax income: Taxable income minus net WI tax.

How It Works: A Step-by-Step Example

Scenario: Tax year 2024, Filing status = Single, Wisconsin taxable income I = $65,000, Credits = $200.

1. Apply brackets (Single 2024): 3.5% up to $13,810; 4.4% $13,810–$27,630; 5.3% $27,630–$304,170; 7.65% above.
2. Compute bracket portions:
   • 3.5% on $13,810 → $483.35
   • 4.4% on $13,820 → $608.08
   • 5.3% on $65,000 − $27,630 = $37,370 → $1,980.61
   Total gross tax ≈ $3,072.04
3. Subtract credits: $3,072.04 − $200 = $2,872.04 (net WI tax)
4. Marginal rate = 5.3% (because $65,000 falls in the third bracket)
5. Effective rate ≈ $2,872.04 / $65,000 ≈ 4.42%
6. After-tax income ≈ $65,000 − $2,872.04 = $62,127.96

Numbers rounded to the nearest cent. The example mirrors the LaTeX formula above.

Frequently Asked Questions (FAQ)