An insertion order, usually shortened to IO, is the document in which an advertiser or its agency commits to buy advertising from a publisher or other seller on stated terms. Once both sides sign, it is the contract for that campaign. The term also has a second, newer meaning. Inside demand-side platforms (DSPs) such as Google's Display & Video 360 (DV360), an insertion order is a container in the account hierarchy that holds budget, pacing and dates for a group of line items. Both fix how much will be spent, where and when, before any ad runs.

What a signed IO contains

The name comes from print, where an advertiser ordered an advertisement inserted in a given issue at the rate-card price. Broadcast and the web inherited the paperwork.

A digital IO is typically a short form sitting on top of a longer set of standard terms. The form carries the commercial fields: advertiser and agency names, the campaign name, each placement (site section, ad unit size or format), start and end dates, the pricing model, usually cost per thousand impressions (CPM) but sometimes a flat fee or cost per click, the rate, the impression goal and the net cost. Those dates define the flight, from which pacing, make-goods and cancellation rights are calculated. Targeting, the counting ad server and the billing contact sit alongside, as does the trafficker who loads the order into systems.

The IAB's current Direct Buy Addendum, finalised in May 2026, sets out the minimum. Each order must state the deliverables, net-dollar prices, a maximum spend excluding taxes, start and end dates and any third-party ad server, according to section 3(a) of the document. Where a long-term relationship exists, the IO usually hangs beneath a master services agreement that fixes terms across many orders.

The standard terms and the clauses that cause arguments

For a quarter of a century, most US digital IOs referenced terms published by the Interactive Advertising Bureau (IAB) and the American Association of Advertising Agencies (4A's). The first set dates from May 2001, according to the IAB. Version 3.0, for media buys of one year or less, appeared at the start of 2010 and stood for 16 years, overlaid by addenda from buyers such as Best Buy and sellers such as Disney Advertising.

That structure has now been replaced. The IAB released draft General Terms for comment on May 20, 2025, and a Direct Buy Addendum on February 12, 2026, with comments open until March 31. Final versions, General Terms 1.1 and the addendum 1.0, are dated May 2026. "We need to move away from bespoke, custom addenda in the ecosystem," David Cohen, the IAB's chief executive, said when the addendum was released. The terms remain voluntary, and the arguments they address are old.

Cancellation. Version 3.0 let an advertiser cancel a standard IO on 14 days' written notice. The 2026 addendum replaces that with checkboxes on the order. Guaranteed buys default to 10 business days' notice, non-guaranteed buys to five, and flat-fee or fixed placements such as roadblocks and sponsorships to 30 days, with a non-cancellable option, according to section 17.

Discrepancies. Publisher and agency ad servers rarely agree. Both the 2010 terms and the 2026 addendum use a 10% threshold: below it, the counting source named on the order stands; above it, the parties reconcile. The 2026 text calls that source the "Controlling Measurement" and, where the order is silent, assigns the role to the ad server that renders the ad.

Invalid traffic. PPC Land's coverage of the draft framework reported default tolerances of 2% for general invalid traffic and 0.1% for sophisticated invalid traffic. The final addendum's section 9(c) instead lets the order set the level and otherwise defers to the level "commonly recognized" under Media Rating Council (MRC) and IAB Tech Lab guidance, giving no number.

Make-goods. When a publisher under-delivers on a guaranteed order, it owes a make-good: extra impressions, an extended flight or a credit. The 2026 addendum allows make-goods in a later campaign for the same advertiser or brand.

Payment and liability. Invoices are usually monthly, on delivered volume, and large advertisers have stretched payment; Procter & Gamble moved suppliers to 75 days in 2013, according to the Wall Street Journal. The most contested clause has been sequential liability, under which an agency owes the publisher only once the advertiser has paid the agency. The Drum described the dispute as a "war of the wages" in March 2009, and a 2021 MediaPost report found few executives still regarded sequential liability as the norm.

The IO inside the software

When campaigns moved into ad servers and DSPs, the contract's structure was copied into the software. In Google Ad Manager, the publisher-side ad server, a sold IO becomes an order containing line items, each with its own dates, goal, priority and targeting, according to Google's help centre. Google has capped the number of Ad Manager line items.

On the buy side, DV360 uses the word directly. Its hierarchy runs partner, advertiser, campaign, insertion order, line item. Creating one involves a name, an objective (brand awareness, clicks, conversion, custom, or none), budget with start and end dates, pacing, a key performance indicator such as cost per completed view, viewability or return on ad spend, an IO-level frequency cap, inventory sources and default targeting, according to Google's help centre. Bids and budget can be automated at IO level or controlled per line item. Google added insertion order objectives to state the goal of the spend at this level, and removed Flight ASAP pacing in November 2024.

A DV360 insertion order is an internal spending envelope, not a contract. Open-auction buys have no seller IO at all.

Origin and evolution

Automation of the paper IO followed two routes. The first replaced it with a protocol. AOL, Yahoo, Microsoft and Yieldex formed a working group in June 2013 to standardise the automated sale of reserved inventory, as PPC Land's programmatic guaranteed explainer records. The IAB finalised OpenDirect 1.0 in January 2015, an application programming interface (API) through which a buyer queries a seller's products, places an order and adds lines: the IO rebuilt as data. Version 2.0 went to comment on January 10, 2018, and 2.1 followed in 2024. Programmatic guaranteed deals now carry many of an IO's commitments through a deal identifier in OpenRTB bid requests.

The second automated the agency workflow. Many agencies raise and reconcile orders in Mediaocean's Prisma, which Microsoft's ad platform integrated with for automated orders; Mediaocean's $500 million purchase of Innovid joined order management with ad serving.

Why it matters to marketers

The IO is where money is committed and where disputes are settled. Disputes over under-delivery or invalid traffic turn on what it said about counting and remedies. Counting rules keep shifting: Google will drop unrendered ads from DV360 and Campaign Manager 360 billing in February 2027, changing what an order priced on billable impressions buys. Reserved demand also clears ahead of the auction in most ad servers, shaping what programmatic buyers can reach. Television and streaming remain IO-heavy: "The majority of premium TV and streaming video orders are direct," Drew Kane, chief product officer of Prisma at Mediaocean, said in March 2026.

Limitations and criticisms

The paper IO is slow. Proposals, versions, signatures and trafficking pass through email, PDFs and spreadsheets, and orders are often keyed twice, once into the seller's system and once into the buyer's. Sellers of programmatic guaranteed inventory now pitch their products against "manual insertion order processing".

Standardisation is weaker than the existence of IAB terms suggests. Addenda have overridden the defaults on liability, cancellation and data, so two IOs on the same template could carry very different risk, and the 2026 framework is voluntary. A 10% tolerance can exceed a campaign's margin. Principal-based buying, in which an agency buys inventory itself and resells it to clients, sits awkwardly with terms written for agents, a tension sharpened by the Association of National Advertisers' (ANA) 2016 report on undisclosed rebates. And an IO records what was bought, not the route impressions took, so it offers little view of supply-path costs.

Not the same as

Purchase order. A purchase order is the buyer's internal finance document authorising spend; an IO is the media agreement with the seller.

Programmatic guaranteed deal. A deal type executed through bidding with a deal ID. It can replace an IO's mechanics, though negotiated terms still need a contract.

Campaign. In most platforms a campaign is the strategic grouping above IOs; one campaign may hold several IOs.

Line item. The executable unit beneath the order or IO, holding targeting, bids and creatives.

Recent developments

Mediaocean launched Prisma Direct on March 31, 2026, aimed at the last manual frontier of TV ad buying. It connects buyer and seller systems through APIs for ordering, trafficking, billing and reconciliation, with Disney as the first media company integrated and a go-live slated for the third quarter. Digiday headlined the pact as the "death knell" for the IO. Warner Bros. Discovery became the second media partner on September 30, starting with its Neo self-service platform; no date was given for a fuller connection. Neither says the order disappears; the rekeying does.

The agentic route runs in parallel. Seller agents and buyer agents are designed to present products, negotiate and book. IAB Tech Lab's AAMP 3.0, published for comment on September 22, 2026, standardises the request-for-proposal stage and hands agreed proposals to OpenDirect 2.1, OpenRTB 2.6 or the Deals API. Comments, first due by October 22, closed on November 10. The IO is becoming machine-readable, but its questions about counting and who pays remain.

Timeline

  • 1990s: Web publishers adopt print-style insertion orders for banner sales
  • May 2001: IAB issues its first standard terms and conditions for internet advertising
  • March 2009: The Drum reports publisher and agency conflict over sequential liability
  • Early 2010: IAB and 4A's version 3.0 terms published, with 14-day cancellation and a 10% discrepancy threshold
  • April 2013: Procter & Gamble extends supplier payment terms to 75 days
  • June 2013: AOL, Yahoo, Microsoft and Yieldex form the OpenDirect working group
  • January 2015: The IAB finalises OpenDirect 1.0
  • June 2016: ANA publishes the K2 Intelligence report on media transparency
  • January 10, 2018: IAB Tech Lab releases OpenDirect 2.0 for public comment
  • 2021: MediaPost reports few executives see sequential liability as the standard
  • March 2023: ANA, 4A's and IAB launch a joint revision of the standard terms
  • 2024: OpenDirect 2.1 released
  • November 2024: DV360 removes Flight ASAP pacing for insertion orders
  • May 20, 2025: IAB releases draft General Terms for comment, open until July 21
  • February 12, 2026: IAB releases the Direct Buy Addendum for comment, open until March 31
  • March 31, 2026: Mediaocean launches Prisma Direct with Disney
  • May 2026: Final General Terms 1.1 and Direct Buy Addendum 1.0 published
  • September 22, 2026: IAB Tech Lab publishes AAMP 3.0 for comment
  • September 30, 2026: Warner Bros. Discovery joins Prisma Direct
  • November 10, 2026: Extended AAMP 3.0 comment period closes
  • February 2027: Google stops billing unrendered ads in DV360 and CM360

Summary

Who: Advertisers and agencies on the buy side, publishers and sales houses on the sell side, the IAB and 4A's as authors of standard terms, IAB Tech Lab for OpenDirect and AAMP, and platforms such as DV360, Google Ad Manager and Mediaocean's Prisma that encode the order in software.

What: A signed commitment to buy defined advertising at a defined price over defined dates, governed by terms on cancellation, counting, make-goods and payment; and, in DSPs such as DV360, a budget and pacing container between campaign and line items.

When: Inherited from print and broadcast, standardised for online media by the IAB from May 2001, governed by version 3.0 terms from 2010, and rewritten as the IAB General Terms and Direct Buy Addendum, finalised in May 2026.

Where: In direct sales between agencies and publishers across display, video, audio and television, especially streaming and TV, and inside buying and serving platforms, with the IAB terms most influential in the United States.

Why: Both sides need a fixed record of what was bought and what happens when delivery, counting or payment goes wrong, and platforms need a level at which budget and dates are controlled.