The Box 14 Retirement Contribution is not included as a credit on your Federal return on Form 8880. Since it is not included in Box 1, it is not taxed.
Neither is it deductible on your Connecticut State return.
The Box 14 amount is for your info only.
Here's more:
https://www.ct.gov/trb/cwp/view.asp?a=1579&q=272076
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