The unincorporated business of a decedent which is carried on by an executor or administrator shall be taxable.
If a receiver or trustee continues the business of an individual or partnership and is duly authorized to continue or carry on that business, the income derived from the business shall be taxable; Provided, that if that business becomes incorporated, it would thereafter be subject to the corporation franchise tax instead of the unincorporated business franchise tax.
D.C. Mun. Regs. tit. 9, r. 9-118