Glossary/Adtech & Programmatic/Ad Tax
Adtech & Programmatic
Ad Tax
The share of media spend absorbed by intermediaries before reaching the publisher.
By Brandon Mina·CEO, BrandPilot AI·Updated November 2026
Appears in Lesson 2 of Programmatic 101
Short answer
Ad tax is the share of advertising spend absorbed by intermediaries such as agencies, DSPs, SSPs, exchanges, and data or verification vendors before money reaches the publisher. Studies have found substantial portions of programmatic budgets lost along the supply chain. Reducing ad tax is a key goal of supply path optimization and direct deals.