Colorado Code
Part 14 - Colorado Uniform Estate Tax Apportionment Act
§ 15-12-1409. Collection of Estate Tax by Fiduciary

Source: L. 2011: Entire part added, (SB 11-165), ch. 184, p. 706, § 1, effective August 10.
If a fiduciary is unable to collect from a person the estate tax apportioned to that person or to be advanced by that person, the fiduciary is authorized to collect the deficiency from any person interested in the apportionable estate whose interest is not exonerated from tax apportionment. The fiduciary is not obliged to collect the deficiency ratably from such persons. At the fiduciary's discretion, the fiduciary is authorized to collect all of the deficiency from one person or from several persons in any proportion that the fiduciary chooses. The reason that the fiduciary is not required to collect a deficiency ratably is that the payment of the estate tax should not be delayed because of difficulties in collecting from a number of persons.
If the amount collected from persons whose interests in the apportionable estate is not exonerated from tax apportionment is insufficient to make up the deficiency, the fiduciary can then collect any remaining deficiency from persons interested in the apportionable estate whose interests are exonerated from tax apportionment. This class excludes persons holding interests in property that qualified for a marital or charitable deduction since those interests are excluded from the apportionable estate. Again, the fiduciary is not required to collect the remaining deficiency ratably from the persons holding exonerated interests.
Finally, if the amount collected from persons holding exonerated interests is insufficient, the fiduciary can collect the balance from persons holding interests that qualify for a marital or charitable deduction. The fiduciary is not required to make that collection ratably.
Anyone who pays more than his share of an estate tax or an advanced tax has a ratable right of reimbursement from those who did not pay their share. If requested, the fiduciary may assist in collecting that reimbursement.

Structure Colorado Code