Section 643(g) Election
Fiduciaries of trusts that pay estimated tax may elect under section 643(g) to have any portion of their estimated tax payments allocated to any of the beneficiaries.
The fiduciary of a decedent's estate may make a section 643(g) election only for the final year of the estate.
You make the election by filing Form 1041-T, Allocation of Estimated Tax Payments to Beneficiaries, by the 65th day after the close of the estate's or trust's tax year. Then, you include that amount on the Schedule K-1 (Form 1041) for the beneficiary(ies) for whom you elected it.
Failure to make a timely election will result in the estimated tax payments not being transferred to the beneficiary(ies) even if you entered the amount you wanted transferred on Schedule K-1.
See the instructions for line 24b for more details.