I moved from CT to NC and I should only pay taxes for the time I was a resident. Why isn't Turbotax prorating my CT tax due?"

[KellyH]

TurboTax calculates the state tax due based on the tax laws in your state. I found a FAQ that should help answer your question.

https://ttlc.intuit.com/replies/4777318

[JenniB]

The proration percentage is based on Connecticut income earned while a resident of CT and CT sourced income divided by total income.  

If all of your income was earned while a resident of CT or is CT sourced income (ex. from a CT employer or CT rental property), then there would be no proration for tax due.

See page 8 of the CT instructions for additional explanation: https://authoring.ct.gov/-/media/DRS/Forms/1-2018/Income/CT-1040NRPY-Online-Booklet_1218.pdf?la=en