The Collaborative International Dictionary
Taxableness
Taxable \Tax"a*ble\, a.
Capable of being taxed; liable by law to the assessment of taxes; as, taxable estate; taxable commodities.
(Law) That may be legally charged by a court against the plaintiff of defendant in a suit; as, taxable costs. [1913 Webster] -- Tax"a*ble*ness, n. -- Tax"a*bly, adv.
Wiktionary
taxableness
n. The state of being subject to taxation.