Introduction: Form MO-1040 for the 2027 Filing Season
"2027 Missouri tax form" can mean two things. Most people searching it want the return filed during 2027, which reports tax year 2026 income.
Others mean income earned during tax year 2027, which is filed in 2028. This guide covers the first meaning.
Missouri's final MO-1040 materials currently stop at tax year 2025. Always follow the tax-year label printed on the form you download, and confirm every 2026 figure against the final instructions once the Missouri Department of Revenue (DOR) posts them.
Below, you'll find who must file, how federal Form 1040 data flows into the Missouri return, what to gather, how to complete each part, and how to file, pay, and fix mistakes.
Key Takeaways
- MO-1040 is Missouri's state return. It does not replace federal Form 1040.
- Confirm tax year, residency, Missouri-source income and form revision first.
- Gather your federal return, W-2s, 1099s, withholding and payment records.
- An extension to file does not extend the time to pay.
What Is Form MO-1040 and Who Must File?
The Missouri Department of Revenue (DOR) calls MO-1040 the "Individual Income Tax Long Form." You file it with Missouri, not the IRS, and it does not satisfy your federal obligation. Your federal adjusted gross income (AGI) goes on Line 1, then Missouri additions, subtractions, deductions, credits, withholding and payments follow.
Who needs to file
Under Missouri's FAQ, no Missouri return is required if you have no federal filing requirement. If you do have one, these exceptions apply:
- Resident Missouri AGI below $1,200
- Nonresident Missouri income below $600
- Missouri AGI below the standard deduction plus exemption amount
These are exceptions, not a universal threshold. Even if you're exempt, you must file to recover Missouri tax withheld from your pay.
Residency and Missouri-source income
You're a Missouri resident if you keep Missouri domicile, or keep permanent living quarters in the state and spend more than 183 days there. A Missouri domiciliary who has no permanent living quarters in the state, keeps quarters elsewhere, and spends 30 days or less in Missouri is treated as a nonresident for filing purposes.
Domicile is your intended permanent home. It continues until you establish a new one, and you can have only one at a time.
Part-year residents and nonresidents report income received while living in Missouri, plus Missouri-source income such as Missouri real property gains or work performed in the state. Remote wages for work done outside Missouri are not taxable merely because the employer sits in Missouri.
Comparing MO-1040 with Other 1040 Forms
Federal Form 1040 goes to the IRS and sets your federal tax. MO-1040 goes to the Missouri Department of Revenue (DOR) and starts from that federal AGI. Different authority, different calculation, different schedules.
| Form | Purpose |
|---|---|
| Federal 1040 | Federal return; supplies the starting figure |
| MO-1040 | Missouri long-form return |
| MO-1040A | Missouri short form, still offered for tax year 2025 |
| MO-A | Missouri adjustments (supplements MO-1040) |
| MO-NRI | Part-year and nonresident allocation |
| MO-CR | Credit for tax paid to other states |
MO-1040A fits filers who meet all of these conditions:
- Single, or married with income from only one spouse
- Missouri-source income only
- No tax credits or income modifications
Anyone owing an underpayment penalty must use MO-1040 with Form MO-2210.
"1040EZ" is not a Missouri form. The IRS retired Form 1040-EZ beginning with tax year 2018, and it has no connection to MO-1040A.
Documents and Information to Gather Before Starting
Collect these before you enter a single number:
- Your completed federal return and schedules
- W-2s, 1099s, and retirement or benefit statements (1099-R, SSA-1099)
- Records of other income
- Missouri withholding records and estimated-tax payment confirmations
- Last year's return
- Bank routing and account numbers for direct deposit
Add more for special situations:
- Self-employed and business owners: profit and loss records, Schedule C support
- Investors: brokerage statements, capital gain records
- Military taxpayers: Leave and Earnings Statements
- Property credit claimants: qualification evidence, paid property tax receipts or rental documentation
- Movers: dates you entered or left Missouri, and income by period
Then verify:
- Names and Social Security numbers (or the identifying number the instructions allow)
- Dependents, address, and filing status
- Residency dates and deposit details
A typo in a bank number can send your refund astray.
How to Complete Form MO-1040 Step by Step
Start with taxpayer information, filing status, residency classification, spouse and dependents. A wrong residency or filing-status choice ripples through every later line, so settle it first.
Reporting federal income and Missouri adjustments
Enter federal AGI on Line 1. Use Form MO-A for Missouri changes. Typical items:
- Additions: interest on other states' bonds, nonqualified 529 or ABLE distributions
- Subtractions: interest on federal obligations, state refunds included in federal AGI
- Capital gains: a 100% individual subtraction begins with tax year 2025
- Savings: up to $8,000 single or $16,000 married combined for qualified MOST or 529 contributions
- Military: qualifying active-duty, Guard and reserve income, and military retirement via MO-A
Retirement rules matter too:
- Public-pension exemption: up to $47,633 per taxpayer for tax year 2025
- Private pensions: up to $6,000 with income limits
- Social Security: deductible on the taxable amount
These are 2025 figures; confirm the amounts in the MO-1040 instructions for your filing year.
Part-year residents and nonresidents use MO-NRI. Divide Missouri income by total AGI, cap the result at 100%, and apply that percentage to Missouri tax. Separate income by the dates you lived or worked in the state.
Applying deductions, exemptions and credits
Deductions lower taxable income. Credits lower the tax itself. Don't mix them up.
Your federal choice drives the Missouri one. Federal standard deduction filers take Missouri's standard deduction. Voluntary federal itemizers can choose either. Those required to itemize federally must itemize in Missouri.
Published standard deductions:
| Filing status | Tax year 2025 | Tax year 2026 |
|---|---|---|
| Single / married separate | $15,750 | $16,100 |
| Married combined | $31,500 | $32,200 |
| Head of household | $23,625 | $24,150 |
The property tax credit changes for 2026. Maximum income limits rise to $38,200 single and $41,000 married for renters, and $42,200 and $48,000 for full-year owner-occupied homesteads.
Eligibility routes include:
- Age 65 or older
- Qualifying disability or 100% service-disabled veteran status
- Surviving spouses aged 60 receiving Social Security benefits
Calculating tax, payments, refund or balance due
Missouri's published 2026 chart tops out at 4.7%. The MO-1040ES instructions show the brackets: no tax on the first $1,348, 2% on the next band, and rising by half a point to 4.7% over $9,436. Final return instructions may differ, so use the schedule printed in them.
Then subtract credits, withholding and estimated payments. Reconcile carefully:
- Include only Missouri withholding shown on your W-2, 1099 or 1099-R
- Attach copies of those statements
- If prefilled or software figures disagree with source documents, trust the documents and fix the entry
Final review and signature
Run this check before filing:
- Recheck the arithmetic on every line
- Confirm federal figures match your federal return
- Attach required schedules and withholding statements
- Verify identification numbers and bank details
- Add preparer details if applicable
- Sign (both spouses on a joint return)
Unsigned, incomplete or improperly attached returns can delay processing or draw a request for more information. Save a full copy before you submit.
2027 Deadlines, Filing Methods, and Payment Options
A confirmed tax year 2026 deadline is hard to find in final return materials, so verify the due date with DOR. For reference, the tax year 2025 return was due April 15, 2026, with an extended date of October 15, 2026. Expect the tax year 2026 dates to follow the same pattern, including any weekend, holiday or disaster adjustments.
Extensions
Missouri accepts an approved federal extension. Attach federal Form 4868 to your Missouri return. If you owe tax, submit Form MO-60 with payment by the original due date. An extension to file is not an extension to pay.
Late filing costs 5% per month of the unpaid balance, up to 25%. Late payment adds 5%. Deficiency interest is 7% in both calendar 2026 and 2027.
E-file or paper
- E-file: approved software, plus free online filing for qualifying taxpayers. DOR sends its own acknowledgment, and the state return usually arrives within three days of correct IRS transmission. Confirm 2027-season provider eligibility.
- Paper: mail to the address printed in your current instructions. Tax year 2025 addresses were Jefferson City PO Box 3222 (refund or no amount due) and PO Box 3370 (balance due), with separate boxes for property credit claims.
Paying and getting refunds
Pay online by eCheck ($0.50 fee) or credit/debit card (2% plus $0.25), or mail a check or money order payable to "Missouri Department of Revenue." Refunds can be direct-deposited. DOR has said electronic returns take about six days and mailed ones up to six weeks, though that isn't guaranteed.
Penalties, interest and disaster relief change. Confirm with DOR before filing.
After Filing: Amendments, Notices, Records, and Professional Help
What to keep
DOR recommends keeping returns and W-2s for four years. Hold on to:
- Signed return and federal return
- Schedules, income and withholding records
- Payment confirmations and e-file acceptance notices
- Any DOR correspondence
Fixing errors and responding to notices
- Amend: file MO-1040, check "Amended Return" and state the reason
- Refund window: generally three years from filing or two years from payment, whichever is later
- Federal changes: report to Missouri within 90 days of a final federal determination or of filing an amended federal return, and pay any added tax
- Notices: respond using the letter's instructions and send the requested evidence. DOR's individual line is 573-751-3505
When to bring in a professional
Get help when your return involves:
- Multi-state income or nonresident allocation
- Self-employment or business ownership
- Cross-border income
- Amended returns, audits or state notices
Part-year residents also need to choose between MO-CR and MO-NRI, since you can't claim both.
VJM Global's CPAs handle federal, state and local tax compliance across all 50 states. That includes US filings for nonresident aliens with US-sourced income, plus individual Form 1040 and 1040-NR preparation.
Frequently Asked Questions
What is the difference between MO-1040 and MO-1040A?
Both are Missouri individual income tax returns. MO-1040 is the long form, while MO-1040A is a short form for simple situations with no credits or income modifications. Check the applicable instructions for eligibility.
What is 1040 vs 1040EZ?
Form 1040 is the current federal individual return. Form 1040-EZ was a simplified federal form the IRS discontinued after tax year 2017. Neither is the same as Missouri's MO-1040.
Is Form 1040 available for 2025?
Yes. The 2025 Form 1040 and its instructions are available on IRS.gov. That federal return is separate from the Missouri return you file during the 2027 season.
Who needs to file Form MO-1040 for the 2027 filing season?
Full-year residents, part-year residents and nonresidents with Missouri-source income may need to file, as may anyone claiming a refund of Missouri withholding. Check current thresholds and exceptions in the instructions.
When is the Missouri Form MO-1040 due in 2027?
It depends on the tax year and DOR's published calendar. The prior-season date was April 15. Check extension and payment deadlines separately, since they differ.
