Designated agent. In the event that there are two or more taxpayer members of a combined group, as a filing convenience, and without changing the respective liability of the group taxpayer members, the taxpayer members of a combined group shall designate one taxpayer member of the combined group to file a single return in the form and manner prescribed by the Chief Financial Officer, in lieu of filing their own respective returns. The designated agent shall be the taxpayer member of the combined group that is either the common parent, or, where there is no such common parent or the parent is not a taxpayer member of the combined group, the taxpayer member of the combined group that has the greatest District business activity during the first year that the combined report is required to be filed, as measured by the total of the District factors, payroll, sales, and property for that year.
Continuity of agency into future years. Once a taxpayer member of the combined group is appointed as the designated agent, it shall remain the designated agent of that group for all future tax years. If the designated agent leaves the combined group, is acquired by another combined group, or ceases to exist, a new designated agent will be determined under § 168.1.
Liability. The designated agent of a combined group consents to act as surety with respect to the tax liability of all other taxpayer members, including, but not limited to, any interest, additions to tax, and penalties. If for any reason the designated agent is unwilling or unable to perform its responsibilities, tax liability may be assessed against the taxpayer members.
D.C. Mun. Regs. tit. 9, r. 9-168