“ | Grants 20 Coin for each Building you own. | ” |
—In-game description |
Royal Tax is a technology available in Age of Empires III: Definitive Edition - Knights of the Mediterranean that can be researched at a Trading Post or Tambo built on a House of Bourbon palace. Once researched, it grants the player 20 coin for each building owned by the player (up to a maximum of 10,000 coin, or 500 buildings).