How Google AI Overviews Are Reshaping Search Ad Impression Share in 2026

Which intent tiers are losing paid visibility, which remain strong, and the 4-step audit every Google Ads account should run this week.

Google AI Overviews — the AI-generated answer blocks that appear at the top of the SERP — have been live in the UK and US for over a year. The SEO community tracked organic CTR drops extensively. What’s less covered is the

selective and intent-specific impact on paid ad impression share.

For Google Ads practitioners, the picture is more nuanced than “AI is killing paid search.” The data points in a clear direction once you segment by keyword intent.

What AI Overviews Are Doing to the SERP

AI Overviews primarily appear for

informational and navigational queries

— “what is”, “how does”, “explain”, general knowledge, and definition searches. When an AI Overview appears, it pushes traditional organic results further down the page — and in many cases, paid ads that appeared above organic results are also displaced or reduced in visibility.

For

transactional and commercial investigation queries

— “hire”, “buy”, “price”, “best agency”, “compare”, “service near me” — AI Overviews appear far less frequently. Google consistently shows that when users have clear purchase or evaluation intent, the platform maintains strong paid ad placement at the top of the SERP.

Impression Share Impact by Intent Tier

Budget allocated to

transactional and commercial intent keywords

is performing more consistently in 2026. Awareness-stage keywords with informational intent are seeing reduced impression efficiency — impressions are dropping, CPC is rising per impression, and conversion rates from these keywords were already lower.

This rewards advertisers who have always focused on

intent-matched keyword strategies

— and penalises accounts that built volume through broad informational terms hoping to capture demand early.

What This Means for Your Account Right Now

The shift is not uniform across all accounts. Advertisers with heavily informational keyword sets — particularly those targeting top-of-funnel awareness with branded informational content — are seeing the steepest IS declines. Accounts focused on mid-to-bottom funnel transactional terms are largely unaffected.

The practical question:

how much of your current Google Ads spend is in informational-intent keywords?

Most accounts that haven’t done a full intent audit in the past 6 months are carrying 15–30% of spend on keywords that AI Overviews are actively deprioritising paid ads for.

Advertza Recommended 4-Step Audit

Export all active keywords by campaign

— filter to Impression Share Lost to Rank column. Any keyword with IS Lost to Rank >40% and declining trend over 8 weeks is your first flag.

Classify each flagged keyword by intent

— use a simple Pass/Fail: does this keyword trigger an AI Overview when searched manually? If yes, that keyword’s paid visibility will be structurally depressed.

Reallocate budget from informational to transactional campaigns

— shift budget away from any keyword group failing the AI Overview test. Redirect to your highest-converting transactional ad groups where paid placement remains dominant.

Set a weekly IS (Lost to Rank) monitoring alert

— in Google Ads, use automated rules: if Search IS Lost to Rank > 35% for any campaign, trigger an email alert. Run this check weekly, segmented by campaign intent type, not just total account IS.

Do this audit this week.

The intent tier segmentation is the key insight

— don’t look at account-level impression share as a single number. Break it down by campaign intent, check Search IS (Lost to Rank) per campaign, and make the budget moves that reflect where Google is actually showing paid ads reliably in 2026.

This is a structural shift, not a temporary fluctuation.

Accounts that adapt their keyword strategy now will have a meaningful CPA advantage within 60–90 days.

Frequently Asked Questions

AI Overviews are AI-generated answer blocks that appear at the top of Google search results for informational queries. They push organic results down and can reduce paid ad visibility for those query types. Transactional and commercial intent keywords are largely unaffected — Google continues showing paid ads prominently for queries with clear purchase intent.

Informational keywords — ‘what is’, ‘how to’, ‘guide’, ‘explain’, ‘tutorial’ — carry the highest risk. These trigger AI Overviews most frequently. Transactional keywords like ‘hire’, ‘buy’, ‘agency’, ‘price’, and ‘service near me’ remain strong for paid ad placement because AI Overviews rarely appear for them.

Export your keywords and check the ‘Search IS (Lost to Rank)’ column in Google Ads. Filter for keywords with IS Lost to Rank above 40% on a declining trend over 8 weeks. Then manually search those keywords to see if an AI Overview appears. If it does, that keyword’s paid visibility is structurally depressed.

Not necessarily stop — but you should review the ROI. If informational keywords were producing conversions, check whether that’s declining. If IS is down and CVR was already low, reallocating that budget to transactional campaigns is the practical move. Run the intent audit first before making blanket decisions.

This is a structural shift, not a temporary fluctuation. Google is expanding AI Overview coverage. Accounts that adapt their keyword strategy toward transactional and commercial intent will maintain strong impression share. Accounts that built volume through broad informational terms will continue to see declining efficiency on those keywords.

AUDIT YOUR ACCOUNT FOR AI OVERVIEW IMPACT

Advertza’s free account audit includes an intent-tier IS analysis — identifying exactly where AI Overviews are costing you impression share and where to redeploy budget.

Audit Your Account for AI Overview Impact

Advertza’s free account audit includes an intent-tier impression share analysis — identifying exactly where AI Overviews are costing you visibility and where to redeploy budget.

Bansi Ganatra is the Co-Founder of Advertza, a performance marketing agency for eCommerce and D2C brands across UK and India. He specialises in Meta Ads, Google Ads, and Shopify performance marketing with hands-on experience scaling brands including Tyl Visuals, Tyl Accessories, and BTMRainwave61. Under his management, a D2C brand reached Rs.9.25L peak monthly revenue with 4x to 6x ROAS.