** NOTICE **

The online credit inquiry system will no longer be available after the end of the day, August 28, 2017.  The Department will implement a new portal service called MyTax Missouri, which will be available September 6, 2017 at https://mytax.mo.gov. The new service will allow you to register a portal account to file and track Sales, Use, and Employer Withholding Tax, and Tire and Lead-Acid Battery Fee returns and payments and has many more features.  The new service will allow you to view your available overpayment information. Please check the website after September 6, 2017, for information on how to access your account overpayment information through this new service. 

Business owners, you can now access the Online Credit Inquiry System to determine if an overpayment exists on your Missouri sales and/or withholding tax account.

Here's how it works:

  • A business owner can enter their Missouri Tax Identification Number and PIN (The Department of Revenue has already assigned the PIN number and it can be found on the front of your return or voucher book )
  • Online Credit Inquiry System will access our tax system, determine whether there is an overpayment on your account and provide instantly:
    • A Statement of Overpayments. The business owner can then access refund applications to request a refund. Withholding accounts may also claim their overpayment as a credit on line three of a future return (Form MO-941).
    • If there are no overpayments, confirmation that there are currently no overpayments on the account for the tax type requested.

The online system provides information that reflects the Department’s prior day processing.

For sales/use tax overpayment assistance, contact

Missouri Department of Revenue
P.O. Box 3350
Jefferson City, MO 65105-3350
Telephone: (573) 526-9938
Fax: (573) 751-9409
E-mail: salesrefund@dor.mo.gov

For withholding tax overpayment assistance, contact

Missouri Department of Revenue
P.O. Box 3375
Jefferson City, MO 65105-3375
Telephone: (573) 751-3505
Fax: (573) 522-6816
E-mail: withholding@dor.mo.gov