US State Income Tax Calculator (state-by-state comparison)
Estimate your US state income tax for a chosen state and filing status. Supports standard deduction or custom deductions and shows methodology, sources, and limitations.
- Page updated:
- Jan 3, 2026
- Tool version:
- v1.1.0
Overview
This calculator provides simplified, state-level income tax estimates based on your selected state, filing status, income, and deductions.
Designed for quick comparison across states. Results are estimates and do not substitute for professional tax advice.
Results
Estimated state tax after credits
$1,290.62
Taxable income
$44,460.00
Estimated state tax
$1,290.62
Effective state rate
2.58%
Notes
Estimate using 2024 single-filer brackets (CA, NY, NJ progressive; PA flat 3.07%; TX/FL/WA have no state income tax). Standard deductions and filing-status adjustments are approximate. Verify with your state tax authority.
How to read the result
- What it means
- The displayed value is an estimate based on your inputs. It represents the calculated scenario under current assumptions, not a guaranteed amount.
- Next step
- Use the result as a starting point. Adjust parameters to compare scenarios and validate with a professional when needed.
- Calculation limits
- The model uses simplified formulas and cannot account for all variables in your specific case (local regulations, personal conditions, temporal changes).
Methodology
Calculation approach: 1) Determine taxable income = gross income - (standard deduction or custom deductions). 2) Apply the state's tax structure: none (no state income tax), flat rate, or progressive brackets. 3) Subtract any user-provided state tax credits to estimate final state tax owed.
Data model: State tax rules are represented as one of: none, flat, or progressive brackets. Bracket-based taxes are calculated by summing tax due within each bracket up to the taxpayer's taxable income.
Limitations: This tool uses simplified brackets and standard deduction values for illustration. It does not account for local/municipal taxes, phaseouts, surtaxes, special credits, alternative minimum tax, or itemized deduction details. Always verify with official state guidance or a tax professional.
Glossary+−
- Taxable Income
Income subject to state tax after subtracting allowed deductions.
- Effective State Tax Rate
Estimated state tax owed divided by gross income (expressed as a percentage).
- Progressive tax bracket
A tax structure where different portions of income are taxed at increasing rates.
Key takeaways
Use this calculator to compare estimated state income tax across states quickly.
Check the methodology and citations and consult official sources for filing-level accuracy.
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Worked examples
Example: Single filer in California
Single filer with $50,000 gross income using standard deduction.
Interpretation
Taxable income = 50,000 - CA standard deduction (4,800) = 45,200. Estimated state tax is calculated by applying CA progressive brackets to 45,200; this yields an illustrative tax estimate. Confirm with state rates.
Frequently asked questions
How accurate are these estimates?
Estimates are indicative and based on simplified state tax tables. They are suitable for rough comparisons but may differ from exact tax returns due to credits, local taxes, or special rules.
Where do the tax rates come from?
Rates and bracket structures are derived from official state tax authority publications and compiled tax datasets. See citations and data verification date below.
Can this tool replace a tax preparer?
No. Use this tool for quick estimates. For filing and tax planning, consult a qualified tax professional.
Sources & references
- IRS - Internal Revenue Service: https://www.irs.gov
- California Franchise Tax Board: https://www.ftb.ca.gov
- New York State Department of Taxation and Finance: https://www.tax.ny.gov
- State tax authority pages for individual states: https://www.taxadmin.org/state-tax-agencies
Quality & oversight
- Author
- Ugo Candido, MBA
- Maintained by
- Ugo Candido, MBA
- Page updated
- Jan 3, 2026
- Tool version
- v1.1.0