Single
Married Filing Jointly
Married Filing Separately
Head of Household
Select a State
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Estimated State Tax Liability
$0.00
Understanding State Tax Calculations
Calculating state income tax can be complex, as each state has its own unique tax laws, rates, deductions, and credits. This calculator provides an *estimate* based on common factors, but it's essential to consult official state tax resources or a tax professional for precise figures.
How It Works:
The general formula for calculating state income tax involves determining your taxable income first. This is typically done by:
Starting with your Annual Gross Income.
Subtracting eligible Deductions (either standard or itemized, whichever is greater, though this calculator simplifies this by asking for a single deduction amount).
This gives you your Adjusted Gross Income (AGI), and then further adjustments might apply before arriving at your final Taxable Income. For simplicity, this calculator assumes that Deductions directly reduce Gross Income to arrive at Taxable Income.
Once taxable income is determined, it's applied to the state's specific tax brackets and rates. Many states use a progressive tax system, meaning higher income levels are taxed at higher rates.
State Tax Systems:
States generally fall into a few categories regarding income tax:
States with no income tax: Alaska, Florida, Nevada, New Hampshire (taxes only interest and dividends), South Dakota, Tennessee (taxes only interest and dividends), Texas, Washington, Wyoming.
States with flat income tax: A single tax rate applies to all income levels (e.g., Pennsylvania, Indiana).
States with progressive income tax: Tax rates increase as income increases, with multiple tax brackets (e.g., California, New York, Colorado).
Factors Affecting Your Tax Liability:
Income Sources: Wages, salaries, investments, business income, etc.
Filing Status: Single, Married Filing Jointly, Married Filing Separately, Head of Household. This affects standard deductions and tax brackets.
Deductions: Standard deduction amounts vary by state and filing status. Itemized deductions include things like mortgage interest, state and local taxes (SALT) up to a limit, charitable contributions, etc.
Tax Credits: These are dollar-for-dollar reductions of your tax liability and can be more valuable than deductions. Examples include child tax credits, education credits, etc. (Note: This calculator does not include tax credits).
Local Taxes: Some cities or counties also impose their own income taxes.
Limitations of This Calculator:
This calculator is a simplified tool for estimation purposes. It does NOT account for:
Specific state tax credits.
Complex deductions or adjustments to income.
Taxation of specific income types (e.g., capital gains, retirement income).
Variations in tax laws between states beyond basic progressive/flat/no tax structures.
Local income taxes.
The alternative minimum tax (AMT).
Disclaimer: All tax calculations are estimates. Consult with a qualified tax professional or refer to your state's official tax forms and publications for accurate information.
function calculateStateTax() {
var income = parseFloat(document.getElementById("income").value);
var filingStatus = document.getElementById("filingStatus").value;
var deductions = parseFloat(document.getElementById("deductions").value);
var state = document.getElementById("state").value;
var taxResult = 0;
var notes = "";
// Basic validation
if (isNaN(income) || income < 0 || isNaN(deductions) || deductions < 0 || state === "") {
document.getElementById("resultContainer").style.display = 'block';
document.getElementById("taxResult").textContent = "Error";
document.getElementById("notes").textContent = "Please enter valid positive numbers for income and deductions, and select a state.";
return;
}
var taxableIncome = income – deductions;
if (taxableIncome 0) {
if (currentTaxableIncome <= bracket1) {
calculatedTax += currentTaxableIncome * taxRate1;
} else {
calculatedTax += bracket1 * taxRate1;
currentTaxableIncome -= bracket1;
if (currentTaxableIncome <= bracket2 – bracket1) {
calculatedTax += currentTaxableIncome * taxRate2;
} else {
calculatedTax += (bracket2 – bracket1) * taxRate2;
currentTaxableIncome -= (bracket2 – bracket1);
if (currentTaxableIncome <= bracket3 – bracket2) {
calculatedTax += currentTaxableIncome * taxRate3;
} else {
calculatedTax += (bracket3 – bracket2) * taxRate3;
currentTaxableIncome -= (bracket3 – bracket2);
if (currentTaxableIncome <= bracket4 – bracket3) {
calculatedTax += currentTaxableIncome * taxRate4;
} else {
calculatedTax += (bracket4 – bracket3) * taxRate4;
currentTaxableIncome -= (bracket4 – bracket3);
if (currentTaxableIncome <= bracket5 – bracket4) {
calculatedTax += currentTaxableIncome * taxRate5;
} else {
calculatedTax += (bracket5 – bracket4) * taxRate5;
currentTaxableIncome -= (bracket5 – bracket4);
if (currentTaxableIncome <= bracket6 – bracket5) {
calculatedTax += currentTaxableIncome * taxRate6;
} else {
calculatedTax += (bracket6 – bracket5) * taxRate6;
currentTaxableIncome -= (bracket6 – bracket5);
if (currentTaxableIncome <= bracket7 – bracket6) {
calculatedTax += currentTaxableIncome * taxRate7;
} else {
calculatedTax += (bracket7 – bracket6) * taxRate7;
currentTaxableIncome -= (bracket7 – bracket6);
if (currentTaxableIncome <= bracket8 – bracket7) {
calculatedTax += currentTaxableIncome * taxRate8;
} else {
calculatedTax += (bracket8 – bracket7) * taxRate8;
currentTaxableIncome -= (bracket8 – bracket7);
if (currentTaxableIncome 0) {
if (currentTaxableIncome <= bracket1) {
calculatedTax += currentTaxableIncome * taxRate1;
} else {
calculatedTax += bracket1 * taxRate1;
currentTaxableIncome -= bracket1;
if (currentTaxableIncome <= bracket2 – bracket1) {
calculatedTax += currentTaxableIncome * taxRate2;
} else {
calculatedTax += (bracket2 – bracket1) * taxRate2;
currentTaxableIncome -= (bracket2 – bracket1);
if (currentTaxableIncome <= bracket3 – bracket2) {
calculatedTax += currentTaxableIncome * taxRate3;
} else {
calculatedTax += (bracket3 – bracket2) * taxRate3;
currentTaxableIncome -= (bracket3 – bracket2);
if (currentTaxableIncome <= bracket4 – bracket3) {
calculatedTax += currentTaxableIncome * taxRate4;
} else {
calculatedTax += (bracket4 – bracket3) * taxRate4;
currentTaxableIncome -= (bracket4 – bracket3);
if (currentTaxableIncome <= bracket5 – bracket4) {
calculatedTax += currentTaxableIncome * taxRate5;
} else {
calculatedTax += (bracket5 – bracket4) * taxRate5;
currentTaxableIncome -= (bracket5 – bracket4);
if (currentTaxableIncome <= bracket6 – bracket5) {
calculatedTax += currentTaxableIncome * taxRate6;
} else {
calculatedTax += (bracket6 – bracket5) * taxRate6;
currentTaxableIncome -= (bracket6 – bracket5);
if (currentTaxableIncome deductions) { // If there's any income after deductions
// This is a placeholder. NH taxes only interest and dividends, not wages.
// A proper calculator would need to know income breakdown.
taxResult = 0; // Assuming income is wages for this example
notes = "New Hampshire taxes only interest and dividend income, not wages. This calculation assumes your income is wages and thus $0 state income tax. If you have interest/dividend income, a different calculation applies.";
} else {
taxResult = 0;
notes = "New Hampshire does not tax wages. Your taxable income is $0 or less.";
}
} else if (state === "AK" || state === "FL" || state === "NV" || state === "SD" || state === "WA" || state === "WY") { // States with no income tax
taxResult = 0;
notes = "This state does not have a broad-based state income tax.";
} else if (state === "IL") { // Illinois – Flat Tax (simplified)
taxResult = taxableIncome * 0.0495; // Example flat rate
notes = "Illinois has a flat tax rate. This is an estimate.";
}
// Add more states and their tax logic here…
else {
notes = "Tax calculation for this state is not yet implemented or it may not have a state income tax. Please check official state resources.";
taxResult = 0; // Default to 0 if state logic isn't present
}
document.getElementById("resultContainer").style.display = 'block';
document.getElementById("taxResult").textContent = "$" + taxResult.toFixed(2);
document.getElementById("notes").textContent = notes;
}