Are you trying to file a 2020 return? As @SundayInSalem said, there was no update needed in TurboTax. Additionally, at this point, the 2020 program includes any changes for that year, as we are well past the 2020 filing deadline.
Connecticut made this change permanent for years after 2020.
Connecticut says:
A Connecticut resident who works in another state that imposes an income tax will be required to file a nonresident income tax return for the other state and a resident return for Connecticut.
The Connecticut resident will receive credit from Connecticut for income tax paid to the other state on income earned for services performed in the other state. The credit allowed will be the lesser of the tax paid to the other state or the tax which Connecticut imposes on the resident's out-of-state wages.
The credit is claimed by completing Form CT-1040, Schedule 2, and attaching a copy of the return filed with the other state.
See: Resident Working in Another State
If you are a Connecticut resident working in another state, prepare your non-resident return first. TurboTax should automatically fill in your tax credit on the Other State Tax Credit Summary.
Tap Edit next to your work state and go through the screens to verify the income and tax paid to your nonresident state.
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