Age of Empires Series Wiki

Villagers gather Coin from Estates faster.
—In-game description

Bookkeeping is a technology in Age of Empires III that can be researched by European civilizations at the Estate once the Industrial Age is reached. Once researched, it allows Settlers, Coureurs des Bois, and Settler Wagons to gather coin from Estates and Rice Paddies 10% faster. Homesteading is the further upgrade of this technology.

Estate technologies in Age of Empires III
EuropeansBookkeeping · Homesteading · Refineries
Native AmericansEarth Ceremony · Earth Gift Ceremony · Excessive Tribute · Flag AztecDE Tezcatlipoca Worship · Flag IroquoisDE Maple Festival · Flag SiouxDE Gun Trade · Flag IncanDE Coca Cultivation