District of Columbia Code Division VIII. General Laws. § 47-1810.08. Accounting rules; future deductions.

(b)(1) For the 7-year period beginning with the 15th year of the combined filing, a combined group shall be entitled to a deduction equal to 1/7th of the net increase in the taxable temporary differences that caused the increase in the net deferred tax liability, as computed at the time of enactment in accordance with generally accepted accounting principles, that would result from the imposition of the combined reporting requirements but for the deduction provided under this section. The amount of the deduction shall in no case exceed the amount necessary to offset any increase in net deferred tax liability, as computed in accordance with generally accepted accounting principles, that would result from the imposition of all of the provisions of combined reporting but for the deduction provided under this section.

(2) If there is an underpayment of estimated tax for tax year 2020 as a result of taking into account the deduction pursuant to this section, the estimated tax interest resulting from such underpayment, upon application, shall be waived.