Follow the steps to fill out the MO DOR Form 126 online effectively.

1. Click the ‘Get Form’ button to access the form electronically.
2. Select the appropriate option to indicate whether you are updating your business tax account or your sales and use exemption account.
3. Provide your name, phone number, and address currently on file to ensure that the Department has your accurate contact information.
4. If applicable, fill in the change owner name and change business name fields. Take note that a Missouri Tax Registration Application (Form 2643) is required if ownership has changed.
5. Complete the Officers, Partners, or Members section accurately, indicating any additions or deletions. Make sure to provide all necessary personal details such as name, birthdate, and Social Security number.
6. If applicable, fill out the Authorized Representatives section. Only include those who have direct supervision or control over tax matters and ensure all information is completely filled out.
7. If you are closing or opening a business location, complete the respective sections with the required details, including address and closing dates.
8. Indicate any changes to your sales and use tax filing frequency, if necessary, by selecting the appropriate option.
9. Review all entries for accuracy and completeness before submission. Ensure that the form is signed by the appropriate person as required.
10. Once reviewed, you can save your changes, download, print, or share the form as necessary for your records.

Complete your MO DOR Form 126 online to ensure your tax and exemption information is up to date.