You must file a Connecticut income tax return if:
- You had CT income tax withheld;
- You made estimated tax payments to CT;
- You made an extension payment to CT;
- You meet the gross income test (see below);
- You had a federal alternative minimum tax liability;
- You are claiming the Connecticut earned income tax credit
if your gross income for the taxable year exceeds:
- $12,000 and you are married filing separately;
- $15,000 and you are filing single;
- $19,000 and you are filing head of household; or.
- $24,000 and you are married filing jointly or qualifying widow(er) with dependent child.
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