You can file a state income tax return without filing a federal return, and the situation is more common than it sounds: your income clears a state’s lower threshold but falls under the federal one. The practical catch is that nearly every state return begins with your federal adjusted gross income, so you’ll have to calculate that number as if you were filing federally, and most tax software and state e-file systems will refuse to transmit a state return unless the IRS has accepted a matching federal one. Expect to do the federal math anyway, then mail the state return.
When This Situation Actually Applies
The gap between federal and state filing thresholds is what puts people here. For the 2025 tax year, the IRS doesn’t require a return from a single filer under 65 unless gross income reaches $15,750, from a head of household unless it reaches $23,625, or from a married couple filing jointly (both under 65) unless it reaches $31,500.1Internal Revenue Service. Check if You Need to File a Tax Return State thresholds sit well below that. Some states trigger a nonresident filing requirement at $1,000 or less of in-state income, and a handful require a return from nonresidents who earn any income at all within their borders.2Tax Foundation. Nonresident Income Tax Filing and Withholding Laws by State, 2026
One boundary before you go further: eight states levy no individual income tax at all — Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, and Wyoming. Washington doesn’t tax wages or salary but imposes a separate tax on capital gains above a threshold. If your only income was earned in a no-tax state and you live there too, there is no state return to file.
Everyone else needs to check the specific filing threshold for their residency category — resident, part-year resident, or nonresident. Residents are taxed on all income from every source. Nonresidents are taxed only on income sourced to the state (wages for work physically performed there, rental income from property there, or business profits from operations inside its borders). Part-year residents fall between the two.
You Still Have to Calculate Your Federal AGI
Almost every state income tax return starts on a line that asks for your federal adjusted gross income, the figure that appears on line 11 of Form 1040.3Internal Revenue Service. Adjusted Gross Income If you’re not filing federally, you don’t have a finished 1040 to copy that number from. You have to build it anyway.
The process is the same one you’d use for a real federal return. Gather all your income documents: W-2s, 1099-NEC forms for freelance or contract work, 1099-INT and 1099-DIV forms for interest and dividends, and any 1099-R forms for retirement distributions. Add up total gross income, then subtract the adjustments that would go on Schedule 1, such as student loan interest, educator expenses, or the deductible portion of self-employment tax. The result is the AGI figure you’ll enter on the state return.
Keep the worksheets. If the state ever questions the return, they’ll want to see how you arrived at that number. Some states explicitly tell filers to complete a “dummy” federal return for this purpose and note on the state form that no federal return was filed.
Why You’ll Probably Have to Paper-File
Most state e-file systems are built to accept a state return only after the IRS has accepted a corresponding federal return. New Jersey’s system, for example, routes the state return through IRS acceptance before making it available to the state.4New Jersey Division of Revenue and Enterprise Services. Division of Revenue E-File Individual Income Tax Returns Without a federal submission in the pipeline, the state return has nowhere to go electronically.
Commercial tax software enforces the same restriction. If you prepare a state return without also preparing and transmitting a federal return through the software, most programs block the electronic submission and force a paper filing. California is one exception, where some software platforms allow state returns to be e-filed independently.
Plan on mailing the return. A few things matter when you do:
- Use the mailing address printed in that year’s form instructions. Many states publish different addresses for returns with payment versus refund returns, so last year’s envelope may be wrong.
- If you owe, include a check or money order payable to the state’s treasury or revenue department, with your Social Security number and the tax year written on the payment. Some states supply a separate payment voucher to include with the check.
- Send it certified mail with return receipt requested. The receipt is your proof of the filing date if a deadline dispute ever comes up.
- Keep a complete copy of the return and every attachment.
Refunds on paper returns are slower. Four to eight weeks is typical, compared with two to three weeks for e-filed returns.
Working Through the State Return
Once the federal AGI is on the top line, the state return applies its own adjustments, deduction, and rate schedule.
State Additions and Subtractions
Additions are amounts the state puts back into income that the federal system left out. The common one is interest from municipal bonds issued by other states: tax-free federally, but most states tax it because they exempt only their own municipalities’ bonds.
Subtractions remove income the state chooses not to tax. Retirement income exclusions, military pay exemptions, and portions of Social Security that were taxed federally but not at the state level are typical examples. The specifics vary so much by state that reading the return instructions line by line beats relying on any general summary.
Standard or Itemized Deduction
Many states set their own standard deduction independent of the federal amount. The 2026 federal standard deduction for a single filer is $16,100; North Carolina’s is $12,750 for the same filer.5North Carolina Department of Revenue. North Carolina Standard Deduction or North Carolina Itemized Deductions Massachusetts offers no standard deduction at all and uses a personal exemption system instead.6Massachusetts Department of Revenue. Differences Between MA and Federal Tax Law for Personal Income State itemized deductions can also differ from the federal list, so the choice that saved you money federally isn’t automatically the right one at the state level.
Rates
The final taxable income figure runs through the state’s rate schedule. Most states with an income tax use progressive brackets. Fifteen states use a flat rate, applying a single percentage to all taxable income.7Tax Foundation. State Individual Income Tax Rates and Brackets, 2026 The current schedule appears in the return instructions on the state tax agency’s website.
Credits
Credits come off the gross tax dollar for dollar. The one to know about if you earned income in more than one state is the credit for taxes paid to another state. Your home state gives you a credit for tax paid to the other state on the same income, capped at whichever is lower: what you actually paid to the other state, or what your home state would have charged on that income. If the other state’s rate is higher, the offset isn’t total, but you aren’t taxed twice on the full amount either.
Other common credits include state versions of the earned income credit (often a percentage of the federal EITC), credits for property taxes paid on a primary residence, and credits for child care expenses. Each has its own schedule and eligibility rules.
Deadlines and Extensions Without a Federal Return
Most states set their individual income tax deadline on April 15. Several give more time: Delaware, Iowa, and New Mexico typically use April 30; Virginia and South Carolina use May 1; Louisiana uses May 15. These dates apply whether or not you file federally.
Extensions are where the no-federal-return situation gets awkward again. Many states automatically honor a federal extension, so filing IRS Form 4868 also extends the state return, often to October 15. If you aren’t filing federally at all, there is no federal extension to piggyback on, and you may need to file a separate state extension form. Some states require their own extension request regardless of what you did federally, so check the state’s specific rule before assuming you have more time.
An extension gives you more time to file, not more time to pay. Interest and penalties on unpaid state tax start accruing from the original deadline even when your extension to file is approved.
What Happens If You Don’t File
Skipping a required state return is riskier than most people assume. States receive copies of W-2s and 1099s and share data with the IRS and with each other. Income sourced to a state where no return was filed eventually surfaces.
Late filing penalties typically run around 5% of the unpaid tax per month, capped at 25%. Late payment penalties add roughly another 0.5% per month. Interest accrues on top of both, generally in the range of about 7% to 11% annually depending on the state.
The bigger consequence is the statute of limitations. When you file a return, most states have a three-year window to audit it and assess additional tax. When you never file, that clock never starts. The state can pursue unfiled returns from years or decades back with no time limit on assessment. Filing the return, even late, starts the clock and caps your exposure.