MO-1040A: Single/Married with One Income Tax Return - Fillable and Calculating Form (2024)
Missouri · Missouri DOR · Used for tax years 2024
Form MO-1040A is Missouri’s 2024 Individual Income Tax Return for Single/Married (One Income) filers. It reports income, deductions, Missouri tax, withholding and estimated tax payments to calculate a refund or amount due.
What you'll need
- Federal return: Have your federal return available for your federal adjusted gross income and federal tax amount.
- Forms W-2 and 1099: Attach copies supporting the Missouri tax withheld reported on Line 11.
- Federal extension: If you have an approved federal extension, check the extension box and attach a copy of Form 4868.
- Itemized deductions: Attach pages 1 and 2 of federal Form 1040 or 1040-SR and federal Schedule A. If you are subject to additional Medicare tax, also attach federal Form 8959.
- Estimated tax payment information: Line 12 asks for Missouri estimated payments made for 2024, including any 2023 overpayment applied to 2024.
- MOST 529 refund deposit: Include Form 5632 if you want to deposit all or part of your refund into a Missouri MOST 529 Education Plan account.
How to file
Complete the return using black ink only. Do not staple it. Sign and date the return. If filing combined, both spouses must sign.
Mail a return with a balance due to:
Missouri Department of Revenue
P.O. Box 3370
Jefferson City, MO 65105-3370
Mail a return with a refund or no amount due to:
Missouri Department of Revenue
P.O. Box 3222
Jefferson City, MO 65105-3222
The form also lists incometaxprocessing@dor.mo.gov for submission of individual income tax returns and fax number (573) 522-1762. It lists income@dor.mo.gov for inquiries and correspondence.
Common mistakes
- Entering federal withholding on Line 4a: This line asks for tax from your federal return, not federal income tax withheld.
- Missing a spouse's signature: Both spouses must sign a combined return.
- Leaving out attachments: Attach W-2 and 1099 copies for Line 11 and a copy of Form 4868 if you check the approved federal extension box.
- Completing the itemized deduction section unnecessarily: Complete it only if you itemized deductions on your federal return.
- Overlooking special standard deduction instructions: If you are age 65 or older, blind, or claimed as a dependent, the form directs you to your federal return or page 6 of the instructions.
- Using the wrong ink or stapling: The form says to print in black ink only and not to staple.
Questions people ask
What standard deduction amounts are printed on the 2024 form?
The form lists $14,600 for single or married filing separately, $21,900 for head of household, and $29,200 for married filing combined or qualifying widow(er). If you are age 65 or older, blind, or claimed as a dependent, it directs you to your federal return or page 6 of the instructions.
Can I apply my overpayment to next year's estimated tax?
Yes. On Line 15, enter the amount of your Line 14 overpayment that you want applied to your 2025 estimated tax.
Can I donate to more than one trust fund?
Yes. The form says you may contribute to any one or all of the trust funds on Line 16. Add the donation amounts from boxes 16a through 16n to calculate the total donation.
Can I deposit my refund into a Missouri MOST 529 Education Plan account?
Yes. Include Form 5632 with your return. You must have an open account administered by the Missouri Education Program, and your total deposit must be at least $25. You may contribute to up to four accounts. Enter the total from Form 5632, Line E, on MO-1040A, Line 17. The Department will cancel the deposit if your refund is offset to pay another debt.