In California, a high earner pays 13.3% to the state on top of 37% federal. In Texas, that same earner pays zero. The difference between living in the right state can be worth tens of thousands a year — and most people learn their state's rate the same way they learn about a bad plumber: after it's already too late.
In This Guide
Nine states currently impose no broad-based individual income tax. For a W-2 employee earning $100,000, living in a no-income-tax state versus one with a 5% flat rate is a straightforward $5,000 annual difference. At $200,000 in a state with a 9% top rate, the spread approaches $18,000.
No-tax states fund their governments through sales taxes, property taxes, and other mechanisms. Texas has no income tax but property tax rates of 1.5%–2.5% of assessed value — among the highest in the country. The absence of income tax doesn't mean the absence of tax burden; it means the burden is structured differently.
In a flat tax state, everyone pays the same percentage regardless of income. The flat tax trend has accelerated sharply since 2021 — multiple states have legislatively converted from progressive systems, often as part of broader reform packages.
| State | Flat Rate | Notes |
|---|---|---|
| Arizona | 2.5% | One of the lowest flat rates in the US |
| Colorado | 4.40% | |
| Georgia | 5.49% | Converted from progressive in 2024 |
| Idaho | 5.8% | |
| Illinois | 4.95% | Constitutional flat tax requirement |
| Indiana | 3.05% | |
| Iowa | 3.8% | Down from higher rates after phased reform |
| Kentucky | 4.0% | Converted to flat in 2023 |
| Massachusetts | 5.0% | 9% on income above $1M (Fair Share Amendment) |
| Michigan | 4.25% | |
| Mississippi | 4.7% | Rate reductions scheduled through 2026 |
| North Carolina | 4.5% | Further reductions phased in through 2026 |
| Pennsylvania | 3.07% | Also notably retiree-friendly (broad exemptions) |
| Utah | 4.65% |
Progressive systems apply higher rates to higher income tiers. The range across states is dramatic — and the threshold at which the top rate kicks in matters as much as the rate itself:
The New York City surcharge: NYC imposes its own local income tax of up to 3.876% on top of state rates. Combined NY State + NYC taxes can reach 14.776% at the top — meaning a high-earning New Yorker faces combined federal, state, and city rates approaching 51% on their marginal dollar.
State income tax isn't always the final layer. Many cities, counties, and school districts impose their own income taxes that stack on top of state rates:
Ohio's municipal tax system is particularly complex — over 600 municipalities impose their own income taxes, each with its own rate, filing requirements, and credit structure. A commuter working in one Ohio city while living in another may owe taxes to both jurisdictions with only a partial credit offsetting duplication.
If you itemize on your federal return, you can deduct state and local taxes paid — but the combined deduction is capped at $10,000 per return ($5,000 MFS) under current law. For high earners in high-tax states paying $20,000–$30,000+ in state income and property taxes annually, this cap is frequently binding. They can only deduct $10,000 of it federally, leaving the rest as a true after-tax cost.
Most states start with federal AGI as a baseline but apply their own adjustments — different standard deductions, different retirement contribution treatment, different capital gains rules. Some states fully tax Social Security income; others exempt it entirely. A large 401(k) contribution that reduces your federal taxable income may or may not reduce your state taxable income, depending on conformity.
The domicile issue: California, New York, and several other high-tax states aggressively audit high-earners claiming to have moved out. To successfully establish domicile, you generally need: 183+ days physically present in the new state, a primary residence there, updated driver's licence and voter registration, and changed banking and professional relationships. A "move" that involves keeping the California home and spending summers there while claiming Nevada residency is exactly what state tax auditors look for.
State income tax policy has moved in one clear direction since 2021: down and flat. More than a dozen states have cut income tax rates or converted progressive systems to flat rates, driven by post-pandemic revenue surpluses, political preference for flat taxation, and competitive pressure from neighbouring low-tax states.
Recent converters include Iowa, Mississippi, Georgia, Arizona, Idaho, Kentucky, and North Carolina — with further rate reductions scheduled in several of these states under already-enacted phased legislation.
On the other side, high-tax states have moved to protect their revenue bases. Massachusetts voters approved a 4% surtax on income above $1M in 2022. Similar proposals have circulated in California, New York, and Washington. The gap between highest and lowest tax states is widening, not narrowing — making state of residence an increasingly consequential financial variable for high earners.
State Tax Is the Variable You Can Actually Control.
Use the federal income tax calculator above to see your full tax picture — then add your state rate to understand the combined burden before making any major decisions.
Calculate My Federal Income Tax →⚠️ Federal calculation only — state rates vary and are not calculated here.