When people ask whether state or federal taxes come first, the answer depends on what part of the process they mean. For filing a return, federal almost always comes first, because state tax forms pull key numbers — usually your adjusted gross income — straight off your completed federal return. For paying through paycheck withholding, both come out at the same time. For refunds, federal typically lands first because the state return can’t even begin processing until the IRS accepts the federal one.
Why the Federal Return Has to Come First
More than 30 states and the District of Columbia use your federal adjusted gross income as the starting point for calculating what you owe the state. A smaller group starts with federal taxable income, the number after deductions. Either way, you can’t complete the state form until the federal one is done. The state return literally asks you to copy a line from the federal return.
E-filing enforces the same order. When you file electronically, the IRS processes and accepts the federal return first, then forwards the state portion to the appropriate state agency. The state return sits in a queue until the federal clears. If the IRS rejects your federal filing for any reason, your state return stalls with it.
The link runs deeper than copying a number. Because so many states piggyback on federal definitions, choices you make on the federal return ripple into the state calculation. Increase a traditional IRA contribution and lower your federal AGI, and your state taxable income usually drops too. Claim a larger standard deduction federally, and states that start from federal taxable income reflect that automatically. States layer on their own add-backs, deductions, and credits, but the federal return is the foundation. That’s one more reason to lock it down before touching the state form.
States Where the Question Doesn’t Apply
If you live in Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, or Wyoming, there’s no state income tax on wages and salary. You file a federal return and you’re done. Washington taxes certain capital gains above $270,000, a narrow exception that doesn’t affect most residents. New Hampshire joined the no-tax group in 2025 when it repealed its tax on interest and dividends. For the other 41 states and D.C., the federal-first filing order applies.
Paycheck Withholding Happens Simultaneously
If you earn a paycheck, neither tax “comes first” in terms of payment. Your employer withholds federal income tax, Social Security, and Medicare at the same time it withholds state income tax (in states that have one). Both amounts leave your pay on the same day.1Internal Revenue Service. Tax Withholding
On the employer side, federal withholding gets deposited with the IRS on either a monthly or semi-weekly schedule depending on total tax liability.2Internal Revenue Service. Depositing and Reporting Employment Taxes State deposits follow whatever schedule the state requires, which often mirrors the federal timing. From your perspective as an employee, both deductions just appear as separate line items on your pay stub.
Estimated Payments if You’re Self-Employed
Self-employed workers, freelancers, and anyone with significant income that isn’t subject to withholding face a different version of this question. The IRS requires quarterly estimated tax payments if you expect to owe $1,000 or more in federal tax for the year after subtracting withholding and credits.3Internal Revenue Service. Estimated Taxes Most states with an income tax have a similar requirement, though the trigger amount varies.
For the 2026 tax year, the federal quarterly deadlines are:
- First quarter: April 15, 2026
- Second quarter: June 15, 2026
- Third quarter: September 15, 2026
- Fourth quarter: January 15, 2027
State estimated payments usually follow the same calendar, though a few states set different dates. You’ll typically calculate and send federal and state estimated payments at the same time, just to separate agencies. Miss a quarterly payment on either side and you’ll owe an underpayment penalty when you file, even if your annual return shows a refund.
Filing Deadlines and Extensions
The federal filing deadline for tax year 2025 returns is April 15, 2026.4Internal Revenue Service. IRS Opens 2026 Filing Season Most states use the same April 15 deadline, though a few differ. When April 15 falls on a weekend or holiday, both federal and state deadlines shift to the next business day.
If you need more time, Form 4868 gets you an automatic six-month federal extension. Some states automatically honor the federal extension; others require a separate state extension form. Check your state’s rules before assuming you’re covered. One point people miss often enough to repeat: an extension gives you more time to file, not more time to pay. If you owe money and don’t pay by April 15, interest and penalties start accruing on both the federal and state side regardless of any extension.
Amending a Return: Federal First Again
If you discover an error after filing and submit an amended federal return on Form 1040-X, that change will almost certainly affect your state return too. The IRS itself warns that a change on your federal return may affect your state tax liability and directs taxpayers to contact their state tax agency.5Internal Revenue Service. Topic No. 308, Amended Returns Most states require you to file an amended state return within a set window — often 90 days to six months — after the federal amendment is processed.
The order mirrors the original filing: amend the federal return first, wait for the IRS to accept the changes, then amend the state return using the corrected federal figures. Skipping the state amendment when it’s required is one of the easier ways to trigger a notice, especially since the IRS shares amended return data with states.6Internal Revenue Service. State Information Sharing
If You Work Across State Lines
Living in one state and working in another complicates the order because you may owe returns to multiple states. Roughly 30 states have reciprocity agreements with at least one neighbor. Under a reciprocity agreement, you only owe income tax in your home state even if your office is across the border. You’ll need to file a withholding exemption form with your employer so they stop withholding for the work state, but you won’t need to file a nonresident return there.
Without reciprocity, you typically file a nonresident return in the state where you work and a resident return in the state where you live. Your home state usually gives you a credit for taxes paid to the work state so you aren’t taxed twice on the same income. The order in this scenario: federal first, then the nonresident state return, then your resident state return, since the resident return needs to know how much credit to claim for taxes paid elsewhere.
Which Refund Arrives First
Expecting money back? The federal refund usually arrives first. The IRS generally processes e-filed returns within 21 days, and refunds come faster with direct deposit.7Internal Revenue Service. Processing Status for Tax Forms State refund timelines vary widely. Some states process refunds in one to two weeks, others take six weeks or longer. Since state returns can’t even begin processing until the federal return is accepted, the state refund almost always trails the federal one by at least a few days. Track your federal refund at irs.gov and your state refund through your state tax agency’s website.8USAGov. Check Your Federal or State Tax Refund Status