Federal income tax gets most of the attention, but for most Americans, state income tax adds another significant bite. The rules vary widely — some states have no income tax at all, others charge flat rates, and the rest use brackets like the federal system. This guide explains how state income taxes generally work, which states don’t have one, the residency rules that matter, and how to handle taxes if you live in one state and work in another.
The 9 states with no income tax
Nine states do not levy a general income tax on wages and most income:
- Alaska
- Florida
- Nevada
- New Hampshire (taxes interest and dividends only; this tax is being phased out)
- South Dakota
- Tennessee (no longer taxes interest/dividends as of 2021)
- Texas
- Washington (taxes high-income capital gains as of 2022)
- Wyoming
These states fund their governments through other revenue sources — sales taxes, property taxes, severance taxes on natural resources, tourism taxes, or sometimes higher fees in other areas. Living in a no-income-tax state doesn’t necessarily mean lower overall taxes; it depends on your spending patterns, home value, and total income mix.
How state income taxes are structured
Among the 41 states (plus DC) that do levy income tax, the structures fall into three categories:
Progressive (bracketed) systems
Most income-tax states use a progressive structure similar to the federal system, with higher rates kicking in at higher income levels. California, for example, has nine brackets ranging from 1% to 12.3% (plus an additional 1% mental-health surtax over $1 million). New York has nine brackets up to 10.9%. Most other progressive states have between 3 and 6 brackets with top rates in the 5–9% range.
Flat-rate systems
Some states charge a single flat rate on all taxable income. Illinois (4.95%), Pennsylvania (3.07%), Indiana (around 3.0%), Michigan (4.25%), and several others use flat-rate systems. A few states have moved from progressive to flat structures in recent years (Iowa, Mississippi, Georgia, North Carolina, among others). Flat-rate states tend to have simpler returns.
Hybrid systems
A handful of states (Massachusetts, Colorado) use a flat base rate plus surcharges on certain types of income or higher earners. Massachusetts charges 5% on most income but adds a 4% surtax on income above $1 million (the “Fair Share Amendment”).
How state taxable income is calculated
Most states start with your federal adjusted gross income (AGI) or federal taxable income, then make state-specific adjustments:
- Add back items federal law allowed but the state doesn’t (e.g., some states add back federal-tax-deductible municipal bond interest from other states)
- Subtract items the state doesn’t tax (e.g., Social Security in many states, state government pension income in some states, military retirement in others)
- Apply the state’s standard deduction or itemized deductions (often different amounts than federal)
- Apply state personal exemptions (sometimes “personal credits” instead)
- Apply the state’s rate schedule to taxable income
- Subtract state-specific credits (renter’s credit, child tax credit, education credit, EITC equivalents, etc.)
State taxes on Social Security and retirement income
Most states — about 40 of the 41 income-tax states — do not tax Social Security benefits at all. Of the few that do (currently Colorado, Connecticut, Minnesota, Montana, New Mexico, Rhode Island, Utah, Vermont, West Virginia), most exempt lower-income retirees or use the same partial-taxation formula as the federal government.
Treatment of pension and 401(k)/IRA income varies widely. Some states (Pennsylvania, Illinois, Mississippi) exclude virtually all retirement income. Others tax it the same as wages. A few offer partial exclusions based on age or income. This is a major retirement-planning factor — relocating from a state that taxes retirement income to one that doesn’t can save thousands per year.
Residency rules: where do you owe state tax?
You generally owe state income tax in the state where you are a legal resident, plus any state where you earned income while physically present. The two key concepts:
Domicile vs. statutory residency
Your domicile is your true, permanent home — where you intend to return when you’re away. You have only one domicile at a time. Even if you spend months in another state, your domicile stays put unless you take active steps to establish a new one.
Most states also have a statutory residency rule — usually triggered by spending 183+ days in the state during the year AND maintaining a “permanent place of abode” (a home, apartment, condo) there. Statutory residency makes you a resident for tax purposes even if your domicile is elsewhere.
Multi-state issues
If you live in one state and work in another, you may owe income tax in both. Most states give a credit for taxes paid to other states to avoid double taxation, but the math can be complicated. Common situations:
- Cross-border workers. Many states have “reciprocal agreements” that exempt nonresidents who only work across the border (Pennsylvania-New Jersey, Maryland-DC, Indiana-Kentucky, etc.).
- Remote workers. Generally, you owe state tax where you physically perform the work. Some states use a “convenience of the employer” rule (New York, Connecticut, Delaware) that treats out-of-state remote work as taxable to the employer’s state.
- Moving mid-year. Both old and new states get a slice based on income earned while a resident of each.
- Snowbirds. Spending winters in Florida doesn’t automatically make you a Florida resident — you have to actively change your domicile by establishing ties (driver’s license, voter registration, primary home, doctors, etc.).
Other state taxes to be aware of
State income tax isn’t the only state tax. Even no-income-tax states often have significant taxes in other forms:
- Sales tax (rates vary from 0% in a few states to 7%+ in others, sometimes plus local rates)
- Property tax (varies by city, county, and state; major retirement-planning consideration)
- Estate and inheritance tax (a handful of states still have one or both)
- Excise taxes on gasoline, alcohol, tobacco, and other specific items
Further Reading
- How Income Tax Works
- How Tax Brackets Work
- How Retirement Income Is Taxed
- How Social Security Income Is Taxed
- Tax Forms Cheat Sheet
This article is for general educational purposes only and does not constitute tax or financial advice. Tax laws and dollar amounts change yearly — verify current rules with the IRS (irs.gov) or consult a qualified tax professional before making decisions.