State Income Tax
Definition
State income tax is a tax imposed by individual states on the income of residents and non-residents who earn income within the state, calculated as a percentage of taxable income.
Detailed Explanation
State income tax is a key revenue source for state governments, funding public services such as education, infrastructure, and healthcare. It is levied on the income earned by individuals, partnerships, corporations, and other entities within a state. Unlike federal income tax, which is uniform across the United States, state income tax rates, brackets, and rules vary significantly from one state to another.
Some states have progressive tax systems, where higher income levels are taxed at higher rates, while others impose a flat tax rate, applying the same percentage regardless of income. A few states, such as Florida and Texas, do not levy a state income tax at all. Instead, they rely on other forms of taxation, like sales and property taxes.
Taxpayers calculate state income tax based on their adjusted gross income (AGI), often starting with their federal AGI and making state-specific adjustments. Tax deductions, credits, and exemptions can further reduce taxable income. State income taxes are filed separately from federal taxes, usually using forms specific to the state.
As of 2025, the following states do not impose a state income tax on individual residents:
- Alaska
- Florida
- Nevada
- South Dakota
- Texas
- Washington
- Wyoming
Additionally, Tennessee and New Hampshire do not tax earned income (e.g., wages or salaries) but do tax certain investment income, such as interest and dividends. However, Tennessee eliminated its tax on investment income starting in 2021, and New Hampshire is phasing out its tax on dividends and interest income, which will be fully eliminated by 2027.
Example
A California resident earning $60,000 in taxable income may pay state income tax at progressive rates ranging from 1% to 9.3%, depending on income brackets.
Key Articles Related To State Income Tax
Related Terms
Adjusted Gross Income (AGI): Total income after specific federal adjustments, often used as the starting point for calculating state income tax.
Flat Tax: A tax system with a single rate applied to all taxable income, regardless of income level.
Progressive Tax: A tax system where higher income levels are taxed at higher rates.
Sales Tax: A consumption tax imposed on the sale of goods and services, used by states without income tax to generate revenue.
Tax Bracket: A range of income levels subject to a specific tax rate in a progressive tax system.
FAQs
Do all states have an income tax?
No, some states, like Florida and Texas, do not impose an income tax.
How is state income tax different from federal income tax?
State income tax rates and rules vary by state, while federal income tax is uniform nationwide.
Can I deduct state income tax on my federal return?
Yes, state income tax is deductible on federal returns if you itemize deductions, subject to the SALT cap of $10,000.
How are non-residents taxed by states?
Non-residents pay state income tax only on income earned within that state.
What happens if I live in one state and work in another?
You may owe taxes to both states, but many states offer credits to avoid double taxation.
Editor: Colin Graves