Fitch Investors Service affirmed the state's general obligation rating last week at AA-plus, but revised the state's credit trend to "uncertain" from "stable."
The state is rated AA-minus by Standard & Poor's Corp. and Aa by Moody's Investors Service.
In a release, Fitch said that the state's credit trend was revised in response to the uncertainty that has come since the election of John Rowland as the governor.
While still a candidate, Rowland promised that one of his top priorities as governor would be to partially or fully roll back the state income tax.
The agency said that the income tax accounts for nearly 40% of gross state tax revenues.
The tax was put in place by outgoing Gov. Lowell Weicker, who chose not to run for reelection.
Fitch's release said the state's rating is supported by the wealth of its citizens and vast economic resources. But despite this, the recovery in Connecticut has been weaker than the rest of the New England states.