What is a state tax return?

A state tax return is the income tax filing you submit to your state's revenue agency reporting income earned and tax owed or refunded for the year. It's separate from your federal Form 1040, uses the state's own brackets and form (like CA Form 540 or NY IT-201), and is required by most states that levy a personal income tax.

What is the difference between state and federal income taxes?

A federal return (Form 1040) goes to the IRS and funds national programs; a state return goes to your state's revenue agency and funds local services. The state return usually starts from your federal figures but applies the state's own rates, deductions, and credits. They are filed separately, and many people file a federal return plus one or more state returns each year.

Do I have to file a state tax return?

Generally yes, if you earned income in a state that levies a personal income tax and meet its filing threshold, which varies by state and filing status. Nine states have no broad personal income tax and require no return. If you lived or worked in more than one state during the year, you may need to file a part-year or nonresident return in each.

How long should I keep state tax returns?

Keep filed state returns and supporting documents for at least 7 years. Most states audit within 3-4 years, but some extend to 6 years when income is substantially underreported and have no limit if no return was filed or it was fraudulent. Hold them indefinitely if they document loss carryforwards, property basis, or residency relevant to future filings.

What's the difference between a state tax return and a 1099-G?

A state tax return is the form you file reporting your income and tax. A 1099-G is an information slip the state sends you reporting payments it made — most commonly a prior-year state tax refund or unemployment compensation — which you may need to report on next year's return. One is what you file; the other is what the state reports to you.

Tax

State Income Tax Return

A state tax return is the income tax filing you submit to a state revenue agency (e.g. California Form 540, New York IT-201, Georgia Form 500) reporting income earned and tax owed or refunded for a given year. It is separate from your federal Form 1040 and from state-issued slips like a 1099-G.

Nine states have no broad personal income tax and require no state return: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

Source: H&R Block — Do I have to file state taxes?

Written & maintained by the Granite team · Last updated June 2026

Overview

A state income tax return is the document you file with your state's department of revenue to report income, calculate state tax, and settle whether you owe a balance or are due a refund. Most states base their return on figures carried over from your federal Form 1040, then apply their own brackets, deductions, and credits. The form number varies by state — Form 540 in California, IT-201 in New York, Form 40 in Alabama, Form 500 in Georgia.

You complete and file it yourself (or via a preparer or tax software); the state revenue agency receives it. Anyone who lived or earned income in a state with an income tax generally files one each year. Nine states have no broad personal income tax and don't require a return, but multi-state workers may file in more than one state.

When you’ll get your State Income Tax Return

You earned income in a state that levies a personal income tax
You moved between states during the year and owe a part-year return in each
You worked remotely or commuted across state lines (nonresident return)
You're claiming a state refund or settling a balance owed
A lender, landlord, or financial-aid office asks for proof of state income
You need it to amend a prior year or respond to a state revenue notice

What’s on your State Income Tax Return

These are the fields Granite reads and extracts automatically the moment you upload one.

State: The state the return is filed with, shown as a two-letter code (CA, NY, AL) or full name on the form.
Form number: The state's specific form name — Form 540, IT-201, Form 40, Form 500 — identifying which return this is.
Taxpayer name & SSN: The primary filer's name and Social Security number (the SSN is usually masked on copies).
Spouse name: Listed when the return is filed jointly with a spouse.
Filing status: Single, married filing jointly, married filing separately, head of household, etc.
State AGI: State adjusted gross income — your income after state-specific adjustments; the line number varies by state.
State taxable income: Income remaining after state deductions and exemptions, the figure your state tax is calculated on.
State tax owed / refund: The final balance due to the state, or the refund amount if you overpaid during the year.

How long to keep it

At least 7 years

Most states can audit a return for 3-4 years (California's Franchise Tax Board uses a 4-year window vs. the IRS's 3), but several extend to 6 years when income is substantially underreported — generally more than 25% omitted — and the window is unlimited if no return was filed or the return was fraudulent. Keeping the full filed copy (plus W-2s and supporting schedules) for 7 years covers nearly every state's lookback window — and you'll want it indefinitely if it documents a capital loss carryforward, property basis, or residency for a future multi-state dispute.

How Granite handles your State Income Tax Return

Drop your state return in and Granite reads it, identifies the state and form number, and pulls out the filer, filing status, state AGI, taxable income, and the tax owed or refund — no manual tagging. It auto-files the return into that year's tax collection alongside your federal 1040 and W-2s, links it to the taxpayer, and makes it findable by searches like "California tax return" or "2023 state taxes." When a lender or auditor asks, it surfaces in one search instead of a folder dig.

FAQ

State Income Tax Return: common questions

What is a state tax return?: A state tax return is the income tax filing you submit to your state's revenue agency reporting income earned and tax owed or refunded for the year. It's separate from your federal Form 1040, uses the state's own brackets and form (like CA Form 540 or NY IT-201), and is required by most states that levy a personal income tax.
What is the difference between state and federal income taxes?: A federal return (Form 1040) goes to the IRS and funds national programs; a state return goes to your state's revenue agency and funds local services. The state return usually starts from your federal figures but applies the state's own rates, deductions, and credits. They are filed separately, and many people file a federal return plus one or more state returns each year.
Do I have to file a state tax return?: Generally yes, if you earned income in a state that levies a personal income tax and meet its filing threshold, which varies by state and filing status. Nine states have no broad personal income tax and require no return. If you lived or worked in more than one state during the year, you may need to file a part-year or nonresident return in each.
How long should I keep state tax returns?: Keep filed state returns and supporting documents for at least 7 years. Most states audit within 3-4 years, but some extend to 6 years when income is substantially underreported and have no limit if no return was filed or it was fraudulent. Hold them indefinitely if they document loss carryforwards, property basis, or residency relevant to future filings.
What's the difference between a state tax return and a 1099-G?: A state tax return is the form you file reporting your income and tax. A 1099-G is an information slip the state sends you reporting payments it made — most commonly a prior-year state tax refund or unemployment compensation — which you may need to report on next year's return. One is what you file; the other is what the state reports to you.

Sources

This page is checked against primary and authoritative sources:

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