Table of Contents

1099 E-Filing: Missouri

Nina Tchistiakova Updated by Nina Tchistiakova

Due date

February 28

The filing deadline for 1099 tax statements is the last day of February. If any due date falls on a Saturday, Sunday or legal holiday, the statements must be filed by the next business day.

E-filing threshold

No Requirement

Filing options

CD, Electronic Filing

Forms to file

All 1099's

Transmittal form

Form MO-W3 Located in CFS Payroll System under “W-2/1099 Information Returns”

Required file name

TY20241099_TransmitterCompanyName_Date.txt

E-filing website

https://sa.dor.mo.gov/efw2/

Contact

573-751-8150

elecfile@dor.mo.gov

Submitting files

The state accepts electronic filing for Prior Years.
Corrected 1099's can be submitted as a new original 1099. Submit a 1099 file containing all 1099's not just the updated information. Please see below for additional information.

If you do not know your Missouri Tax ID or PIN number, you can contact our taxpayer assistance phone lines by telephone at 573-751-7200, by email at businesstaxregister@dor.mo.gov, or by fax at 573-522-1722.

Uploading a File How to:

1. Click the File and Electronic W-2 or 1099 hyperlink under the Electronic Filing Options on the Department’s website: https://sa.dor.mo.gov/efw2/.

2. Enter the Missouri Identification Number and PIN

3. Click the Select File Type W-2 or 1099

4. Click the Choose File Button

5. Enter the Business Name

6. Enter the Contact Name

7. Enter the Email Address

8. Click the Submit W-2 or 1099 file button

9. Print and/or Save Confirmation Number for your records

  • You will receive a confirmation number after the file is successfully uploaded. Keep this confirmation number for your records.

Corrections

If an error was made in regard to 1099 Form(s) that does not change the withholding amount reported, you may request the preciously submitted file be deleted. Email ElecFile@dor.mo.gov and provide the confirmation number and/or the name of the file. Then you may submit the newly corrected replacement file at any time.

IMPORTANT NOTE: When resubmitting a file, you will need to upload the entire file, as if you are submitting it for the first time.

Please be advised, you cannot correct an error made in the amount withheld of an original 1099(s) through electronic submission. You must complete an amended MO-941 return and submit paper Form 1099(s) with the form.

For additional information and/or questions in regard to amending a previously submitted MO-941 and the correct documentation to provided visit the Employer’s Tax Guide (Form 4282) on the Departments website: https://dor.mo.gov\forms.

Cd Filing

The Department accepts Compact Disc (CDs) and Flash Drives. To ensure a smooth process, please follow the below guidelines:

Each of your compact discs or flash drives should have an external label that includes the following details:

  • Missouri Tax Identification Number
  • Business Name
  • Return Mailing Address
  • Tax Year

Email: elecfile@dor.mo.gov

Subject: Compact Disc/Flash Drive Password

Ensure the label contains “Password Protected” and the date the password was emailed.

Mail To:

Missouri Department of Revenue Taxation Division

P.O. Box 3330

Jefferson City, MO 651055-3375

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