I lived in Florida ( 9 months) where there’s no state taxes and 3 months in Missouri where there are state taxes. How do I dispute my liability - I feel it’s too high.

You should have reported only the income you received while you were a resident of Missouri.

If you lived and worked in MO for only part of the year then you should prepare a part-year return for MO.  You are subject to MO state tax for the income you received while living in MO, but not for the time when you were living/working in FL.

 

 

https://ttlc.intuit.com/questions/1901227-how-do-i-file-a-part-year-state-return

 

https://ttlc.intuit.com/questions/1901560-how-do-i-file-if-i-moved-to-a-different-state-last-year

 

https://ttlc.intuit.com/questions/2895983-how-do-i-allocate-split-income-for-a-part-year-state-return

 

The Missouri Form MO-NRI to report income only received while a MO resident is not yet updated for tax year 2024.  You need to wait for MO forms and schedules are updated.

Go to this TurboTax website for forms availability - https://form-status.app.intuit.com/tax-forms-availability/formsavailability?albRedirect=true&product=Turbotax_online&bu=cg

True...make sure you are using the MO-NRI to report the income you received (Wages, Interest Dividends, etc) after you moved to MO.

 

Missouri is one of a couple states that has part-year residents choose to file either as Full-year resident, and taking a credit for taxes paid to the other state...or as a full-yr Non-resident...reporting only all of their income received after moving to MO. 

 

Make sure you are using the Nonresident choice........if you take the full-yr resident route, MO will tax all your FL income too, with no credit for income taxes paid to FL, since FL has no income tax.