What are IO Contracts?
The IO contract, short for Insertion Order, is the final step in the ad proposal process. It represents a formal commitment from an advertiser to run a campaign with a publisher or media partner, locking in the specific terms both parties have agreed to before any ads go live.
What Does an IO Contract Include?
An IO document typically outlines everything needed to execute an advertising campaign without ambiguity. Standard elements of an IO agreement include:
- Campaign dates — the start and end dates of the ad flight
- Ad placements — the specific channels, formats, or inventory where ads will run (display, mobile, CTV, audio, etc.)
- Budget and pricing — total spend, CPM rates, or other pricing models agreed upon
- Creative specifications — ad sizes, formats, and any technical requirements
- Targeting parameters — audience segments, geographies, or contextual criteria
- Cancellation and revision terms — conditions under which either party can make changes
Once both the advertiser and the publisher sign the IO agreement, it becomes a binding document that governs how the campaign will run.
Why IO Contracts Matter in Advertising
IO in advertising serves as the handshake that moves a deal from negotiation to execution. Without a signed IO contract, ad campaigns lack the legal and operational foundation needed to proceed confidently.
For advertisers, the IO document provides a clear record of what was purchased and at what price, making it easier to hold media partners accountable. For publishers and ad platforms, it confirms budget commitment before allocating inventory.
The IO agreement also creates a paper trail that supports billing, reconciliation, and post-campaign reporting, reducing disputes over what was delivered versus what was promised.