Follow the steps to fill out the MO MO-1040 online confidently.

1. Click ‘Get Form’ button to obtain the MO-1040 form and open it in the editor.
2. Begin by selecting the appropriate type of return if applicable — amendment or composite return. Fill in the vendor code and fiscal year dates if filing outside the calendar year.
3. Indicate your eligibility for specific exemptions or attributes, such as age or disability, for both yourself and your spouse.
4. Enter your and your spouse's social security numbers, names, and addresses clearly in the designated fields.
5. Provide your federal adjusted gross income from your 2017 federal tax return and then report total additions and subtractions using Form MO-A as required.
6. Calculate your Missouri adjusted gross income by following the instructions for subtracting your total subtractions from your total income.
7. Select your filing status from the options available and enter the corresponding exemption amounts.
8. Complete the following sections related to deductions for the specific taxes and credits you may be entitled to claim.
9. Ensure you fill out any additional information requested regarding dependents, tax modifications, and other deductions.
10. Review all entries for accuracy before saving or submitting your completed form online.
11. After verifying your completion, you can save your changes, download, print, or share the form as needed.

Take control of your tax filing — complete the MO-1040 online today!