'Books Bought with Tax') is a Japanese manga series written by Zuino and illustrated by Kei Keiyama.

The story follows Ishidaira, an unruly student who, after discovering a love of books, comes to work at a library.

Along with his senior coworkers Hayasemaru and Shirai, he solves problems such as damaged books and the mysteries behind them.

Written by Zuino and illustrated by Kei Keiyama, Zeikin de Katta Hon started in Kodansha's online platform YanMaga Web on August 16, 2021.

[22] It ranked ninth in the Nationwide Bookstore Employees' Recommended Comics of 2023.