State income tax: why your tax bill depends on where you live
-
Key takeaways
State income tax is collected by most, but not all, states on top of federal income tax.
A handful of states have no state income tax at all, while others have their own bracket systems with meaningfully different rates.
Which state’s income tax applies depends primarily on state of residence, though working across state lines can complicate this.
Moving between states partway through the year can mean filing part-year returns in more than one state.
Understanding a specific state’s approach helps in accurately estimating a total tax obligation.
State income tax adds a second layer on top of federal tax, and it varies enormously depending on where someone lives. Here’s how to understand a specific state’s approach.
What is state income tax?
State income tax is a tax collected by most U.S. states on income earned by residents, and in some cases nonresidents who earn income within that state, layered on top of the separate federal income tax collected by the IRS. Not every state has one; a handful have no state income tax at all, while the states that do impose it vary considerably in their specific rates and bracket structures.
Why your state matters as much as your income
Two people earning identical incomes can end up with meaningfully different total tax bills depending solely on which state they live and work in, since state income tax rates and structures vary so significantly. According to the Tax Foundation(opens in new window), most states levy a broad-based individual income tax, some using a single flat rate and others a graduated bracket structure, while a small number of states have no state income tax at all, relying instead on other revenue sources like sales or property tax.
What happens when you move or work across state lines
Moving to a new state partway through the tax year generally means filing a part-year resident return in both the old and new state, each taxing only the income earned while a resident there.
Working in one state while living in another can also create a filing obligation in both states, though many states have reciprocity agreements that prevent the same income from being taxed twice in this situation, making it worth checking whether the specific two states have such an agreement. For anyone filing for the first time as an immigrant, this guide to filing taxes in the U.S.(opens in new window) covers the broader process alongside state-specific considerations.
When to consult a tax professional
Consult a tax professional for anyone who moved between states during the tax year, since determining exactly how to split income and file correctly in each state can be genuinely complicated. It’s also worth guidance for anyone who works in a different state than they live in, since reciprocity agreements and out-of-state tax credits vary considerably depending on the specific states involved.
What state income tax means for people sending money internationally
A state income tax obligation is calculated based on total taxable income for the year, regardless of how that after-tax money is later spent or transferred, meaning sending money to family abroad doesn’t create any separate state tax consideration beyond the existing income tax obligation.
Local income tax as a third possible layer
Beyond state income tax, some cities and counties impose their own additional local income tax on top of both federal and state tax, adding yet another layer specific to certain locations. Checking whether a specific city or county has this additional tax helps in building a truly complete picture of total tax obligation.
Filing extensions work differently at the state level
Requesting a federal filing extension is worth checking against a specific state’s rules, since some states automatically honor that extension while others require a separate state-specific extension request, and assuming the two are automatically linked can lead to an unexpected state filing penalty.
Why some remote workers face a surprising multi-state situation
An increase in remote work has created situations where someone lives in one state but works for a company based in another, sometimes triggering a filing obligation in both states depending on each state’s specific rules about where income is considered “earned,” making this an increasingly common source of unexpected complexity.
Retirement income sometimes receives different state treatment
Some states offer favorable tax treatment for retirement income specifically, like Social Security benefits or pension income, that differs from how they tax working wages, making state choice a genuinely relevant factor for retirement planning specifically, beyond just current-year income tax comparisons.
Why some states tax based on domicile, not just physical presence
Some states use the concept of “domicile,” a true, permanent home, rather than simple physical presence, to determine residency for tax purposes, which can create genuine complexity for anyone maintaining ties to more than one state without having clearly established which one is their actual domicile.
Common questions about state income tax
-
Do I have to pay state income tax if I only lived somewhere for part of the year?
Generally, yes, but only on the income earned while a resident of that state, filed as a part-year resident return, a different form and calculation than a full-year resident return.
-
Which states have no state income tax?
A small number of states impose no state income tax at all, though residents there still generally pay federal income tax and may face higher sales or property tax as an alternative revenue source, so it’s worth checking a specific state’s current approach rather than assuming a nationwide standard.
-
Does my immigration status affect my state income tax obligation?
State income tax generally follows the same residency and income concepts established for federal purposes, meaning federal tax residency status, as covered under IRS Publication 519, typically carries over to how a state treats income too.
In Summary
State income tax varies enormously depending on where someone lives and works, making it worth understanding a specific state’s rules rather than assuming a single nationwide approach applies.
This publication is provided for general information purposes only and is not intended to cover all aspects of the topics discussed herein. This publication is not a substitute for seeking advice from an applicable specialist or professional. The content in this publication does not constitute legal, tax, or other professional advice from Remitly or any of its affiliates and should not be relied upon as such. While we strive to keep our posts up to date and accurate, we cannot represent, warrant, or otherwise guarantee that the content is accurate, complete, or up to date.