How to Use State Tax Calculator
The State Tax Calculator is for U.S. workers, freelancers, and recruiters comparing offers across states.
- Pick a State — Defaults to California. The dropdown lists popular states with their tax model.
- Enter Annual Income — Gross annual income.
- Enter Deductions — Standard or itemized deduction estimate.
- Pick a Currency — Use the currency selector for the matching symbol.
- Read the Result — The State Tax Calculator shows state income tax, taxable income, marginal rate, and effective rate.
Formula & Theory - State Tax Calculator
The State Tax Calculator uses these formulas:
Taxable Income = max(0, Annual Income − Deductions)
Flat State Tax = Taxable Income × Flat Rate
Progressive State Tax = sum across brackets, each segment × its rate
Effective Rate = State Tax ÷ Annual Income × 100%| Symbol | Meaning |
|---|---|
| Annual Income | Gross yearly income |
| Deductions | Standard or itemized deduction |
| Marginal Rate | Top bracket reached |
| Effective Rate | Total state tax ÷ gross income |
Assumptions and Limits
The State Tax Calculator uses simplified single-filer reference brackets. It does not model credits, exemptions, married/HoH brackets, local taxes, or temporary surtaxes. Numbers are illustrative only.
Use Cases for State Tax Calculator
The State Tax Calculator is useful for:
- Comparing job offers across states.
- Remote work — Estimate the state tax impact of moving.
- Quarterly tax planning — For self-employed taxpayers.
- Retirement planning — See how state choice affects after-tax income.
The State Tax Calculator runs in your browser so you can swap states and incomes privately.