It depends. Missouri law explicitly states that your state standard deduction should match your federal standard deduction. If you claimed a Net Qualified Disaster Loss (which increases your federal standard deduction via Form 4684), Missouri honors that increase. However, the Missouri Department of Revenue (DOR) has a very specific rule for this:
- To claim an increased standard deduction due to a disaster loss, you must file a paper return.
- TurboTax "knows" this rule. If the software sees that your standard deduction is higher than the Missouri base amount (e.g., higher than $15,750 for Single or $31,500 for Married Filing Jointly for 2025) because of a disaster loss, it will often disable e-filing to prevent the state from automatically rejecting your return.
Missouri requires physical documentation to verify disaster-related increases to the standard deduction. When you claim this, you generally have to:
- Write "net qualified disaster loss increase" on the dotted line of your MO-1040.
- Attach a copy of your Federal Form 4684 and Federal Schedule A.
- Manual “write-ins” and certain attachments aren’t always supported by standard e-filing, so the software requires a paper filing to keep you in line with state rules.
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