See information beginning on page 12 to assist you in completing this form.
Total additions: add lines 1 through 6 and enter the total on Form MO-1040, Line 2.
Total subtractions: add lines 8 through 18.
Part 2 - Missouri Itemized Deductions: complete this section only if you itemize deductions on your federal return.
Social security deduction: to be eligible you must be 62 years of age by December 31 and have selected the 62 and older box on page 1 of Form MO-1040.
Disability: age limit does not apply to social security disability deduction.
| Question | Answer |
|---|---|
| Form Name | Form MO-A |
| Form Length | 3 pages |
| Fillable? | Yes |
| Fillable fields | 106 |
| Avg. time to fill out | 18 min |
| Edition | 2025 |
| Matches the agency's file | Yes, checked October 9, 2026 |
| Other names | MO-A, MO A, Form MO-A, Missouri MO-A, MO-A 2025, Individual Income Tax Adjustments |
| Official source | Form MO-A (Rev 2025), |
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