Game concept
Tax Jurisdiction
The game also links it as Tax Jurisdictions.
From the game's encyclopedia
A Tax Jurisdiction is a group of Taxpayers made up of Clan Vassals. Each Tax Jurisdiction supports up to 12 Taxpayers.
Each Tax Jurisdiction can have a Tax Decree.
The number of available Tax Jurisdictions is determined by Rank, Traditions, and Innovations.
A Tax Jurisdiction requires a Tax Collector to be appointed.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Tax Jurisdiction is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Tax Jurisdiction is a group of Taxpayers made up of Clan Vassals." It is part of Clan. It covers Tax Collector, Tax Decree, Taxpayer and Untaxed Jurisdiction. The game also links it as Tax Jurisdictions. Patch 1.20.1.2, from game/common/game_concepts/03_fp3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/03_fp3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.