In this subtitle the following words have the meanings indicated. “Federal credit” means: the maximum allowable credit for State taxes under § 2604 of the Internal Revenue Code against the federal generation-skipping transfer tax; less the amount that bears the same ratio to the maximum allowable credit as the value of the generation-skipping transfer taxable by all other states bears to the total value of the generation-skipping transfer. “Federal generation-skipping transfer tax” means the tax imposed by § 2601 of the Internal Revenue Code. “Generation-skipping transfer” means a transfer subject to the federal generation-skipping transfer tax. “Original transferor” means an individual who makes a transfer of property that results in the imposition of the federal generation-skipping transfer tax.