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The US advertising market is growing 2026 faster than expected at the start of the year – and an ever larger share of budgets is being steered by automated campaign systems. The IAB has raised its forecast for US ad spend growth from 9,5 to 12,3 percent. In parallel, Madison & Wall estimates that already 12 percent of US ad spend runs through AI or heavily automated campaign types such as Google's Performance Max or Meta's Advantage+.
US advertising forecast rises significantly
As Digiday reports, the IAB attributes the higher forecast partly to strong ad investment around the Winter Olympics and the football World Cup. The original January forecast had been at 9,5 percent. The IAB update from the 10 of September 2026 is based on input from more than 200 decision-makers on the brand and agency side.
Other forecasts also see a robust market, though with different definitions and boundaries. According to Digiday, Madison & Wall expects roughly 11 percent growth worldwide for 2026 and more than 1,3 trillion dollars in ad spend. WPP Media forecast 8,9 percent growth to 1,3 trillion dollars in June, excluding US political advertising. Such figures are therefore not directly comparable.
12 percent of US budgets already run through AI campaigns
More interesting than the pure market size is the shift in buying. Madison & Wall puts the share of AI-driven advertising 2026 at 12 percent of a US market of 479 billion dollars excluding political advertising. 2023 it is said to have been only 2 percent. By 2030 the consultancy expects 158 billion dollars, or 27 percent, of the US advertising market.
This does not simply mean every campaign where an algorithm is involved somewhere. The narrower definition covers systems that largely take over essential parts of targeting, bidding, budget allocation, placement and optimisation themselves; Adobe likewise summarises the underlying Madison & Wall definition in this sense. Search and social advertising are driving this development particularly strongly.
This matches the development already visible at Meta Ads 2026: platforms are automating not only delivery and bids but increasingly also creative production and attribution. Snapchat is likewise relying on generative AI and stronger automation to drive advertising growth.
Why other AI forecasts look much higher
The definition is decisive. In its current Global Ad Spend Forecast, Dentsu expects that by 2028 already 75 percent of global ad spend will be algorithmically influenced. This does not contradict Madison & Wall's 27 percent: Dentsu counts more broadly and includes spend where algorithms are materially involved in the purchase decision. Madison & Wall looks at a narrower form of largely automated campaign control.
For marketers this distinction matters. "AI advertising" can today mean both an automatically optimised Meta or Google buy and advertising inside an AI product such as ChatGPT. The latter is still a significantly smaller market. ChatGPT Ads have meanwhile reached an annualised revenue run rate of one billion dollars, but remain far below the budgets already running through automated campaign systems of established platforms.
Social, CTV and commerce are growing particularly fast
According to the IAB forecast cited by Digiday, social media advertising in the US is set to grow 2026 by 16,5 percent. Connected TV is expected to grow 15,6 percent and commerce media 13,6 percent. These channels are strongly data- and optimisation-driven and are therefore particularly well suited to automated delivery.
For advertisers, this shifts the operational task. Less time goes into manually micromanaging bids and audiences; what matters more are clean conversion signals, reliable measurement, creative quality, and clear boundaries on which decisions the platform itself is allowed to make. The black box isn't getting smaller – but a larger share of the budget now runs through it.