If you know the amount of taxes due, you can pay the amount online with the Missouri Department of Revenue. Here is information and a link from their Web-site:
The Missouri Department of Revenue accepts the following types of payments:
- Electronic Bank Draft (E-Check). With your routing number, checking/savings account number you can pay online, or call (888) 929-0513. There will be a .50 cent handling fee to use this service.
- Check or Money Order. Your check or money order (U.S. funds only), payable to the Missouri Department of Revenue, should be mailed to the Department of Revenue, P.O. Box 385, Jefferson City, MO 65105-0385. By submitting payment by check, you authorize the Department to process the check electronically upon receipt. Do not postdate. The Department may electronically resubmit checks returned for insufficient or uncollected funds. If you mail your payment after you return is filed, attach your payment to Form MO-1040V.
- Credit Card. The department accepts MasterCard, Discover, Visa, and American Express. You can pay online, or call (888) 929-0513.
Individual Income Tax FAQs - Missouri Department of Revenue