DOR Taxation web site

Do I need to File?

Every resident estate or trust and an estate or trust with Colorado source income that is required to file a federal information return (such as the 5227 or 1041A) must also file a Colorado 105 Fiduciary Income Tax Return. The Colorado income tax return must cover the same tax period as used for federal income tax purposes.  Complete the appropriate schedules to provide beneficiary and income information.


The nonresident tax is apportioned in the ratio of the Colorado taxable income to the modifed federal taxable income.  Use the Colorado Schedule E -- Nonresident Estate or Trust Apportionment Schedule found in the Colorado 105 booklet.

If an executor or administrator is required to file a federal income tax return for a decedent who was a Colorado resident or a nonresident with Colorado source income, a Colorado income tax return must be filed for the decedent.


A Colorado Account Number is assigned to an estate/trust account when the first tax filing is submitted with a Federal Employer Identification Number (FEIN).  The FEIN is assigned by the Internal Revenue Service (IRS) when the estate or trust is created.  If a Colorado Account Number has been assigned to the estate or trust, it must be entered on the 105 form.