You must file a Colorado income tax return if during the year you were:
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- A part-year resident of Colorado with taxable income during that part of the year you were a resident, or
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- A nonresident of Colorado with Colorado source income;
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AND
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- You are required to file a federal income tax return, or
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- You have a Colorado income tax liability for the year.
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There is no minimum income threshold for filing a Colorado income tax return. You must file a Colorado income tax return regardless of age or residency status if you wish to receive a refund on wage withholding reported on your W-2 form. Nonresidents must complete a nonresident schedule, form 104PN, to compute the Colorado tax due.