CT part year resident is only taxed on the CT income. Working several jobs, frequently means not enough taxes are taken out when you combine the totals. How Nonresidents and Part-Year Residents are Taxed
Without seeing your return and your forms, we can't guess at your personal situation. You can take a look at the state tax withheld and divide it by the income. This may show you some of the issue. Perhaps you filed as a resident instead of part-year?
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