What Google's 17 August 2026 Smart Bidding change means for your account

On 17 August 2026, Google changed how Smart Bidding behaves in campaigns that are limited by budget and use a Target CPA or Target ROAS strategy. Before, those campaigns often delivered better results than the target they were given. Now they bid to the target itself. The rollout ran globally from 17 to 27 August.

If your paid search results dipped in late August, part of that may be this change, and part of it may be how your team reacted to it. The short version below is in plain terms; the technical detail follows.

The short version

What changed. Many advertisers give Google a target, such as "get me a demo request for €200". When a campaign was limited by its budget, Google's system often did better than that target, for example €140 per demo request. Since 17 August, Google aims for the target you set. If the target says €200, the campaign will now tend to deliver close to €200.

Why it matters to your numbers. Google says spend on these campaigns stays within your budget. What changes is what the money buys. The same monthly budget at a higher cost per conversion means fewer conversions. If your target was set loosely, perhaps as a safety margin, you are now paying up to that margin.

Why it matters to your reports. Any comparison that spans 17 August, such as "August against July", mixes two different ways of bidding. A drop may be the market, or it may be the change. Your team's own response (new targets, new budgets) adds a third factor.

What to ask your team or agency:

1. Which of our campaigns were limited by budget and used a target on 17 August?
2. Were those campaigns beating their targets before the change, and by how much?
3. Did we review our targets, and are they based on what a lead or trial is worth to us?
4. When did we make changes, and are our reports marked so we can tell our changes apart from Google's?
5. Which comparison windows are clean, and when will we have enough data to judge?

The technical detail

What Google changed

Google's Help Centre describes the update as bidding systems that "deliver more consistent and predictable performance based on the targets you set, even when you make budget adjustments". Google's own example: a campaign with a Target CPA of $10 and a recent actual CPA of $5 "will deliver more closely to a $10 actual CPA starting August 17, 2026".

Previously, when a target-based campaign hit its budget ceiling, bids could sit well below what the target allowed, so the campaign beat its target. That headroom is now spent. Bids rise towards the level the target permits, the budget is still spent, and cost per conversion drifts towards the target.

Google does not adjust targets for you. It released a Bid Target Adjustment Tool on 6 July, surfaced through account notifications, which lets you keep your current target, match recent performance or set a custom target. Google does not calculate a recommended target for campaigns with fewer than seven conversions. For fixed budgets where you want the most volume within the budget, Google points to Maximise conversions or Maximise conversion value. It also advises against applying data exclusions or bid limits purely in response to the update.

Why B2B SaaS accounts feel it more

Two patterns from the accounts we run make this change bite harder in B2B software.

First, targets in B2B SaaS are often set loosely. A Target CPA gets set when a campaign launches, the campaign beats it for months, and nobody revisits it because results look good. The target quietly becomes a ceiling nobody intended to reach.

Second, the conversion Smart Bidding sees is usually a trial or demo request, and its value varies widely. Without CRM data flowing back into the account, a hobbyist and a 40-seat team evaluating a switch look identical to the bidding system. If the target now gets reached, it helps to know that the target was set with lead quality in mind. Our article on value-based bidding for B2B SaaS covers how to feed pipeline value back to Google.

How to diagnose the impact in your account

1. List exposed campaigns. Filter for target-based campaigns that showed "Limited by budget" in the weeks before 17 August. Include portfolio strategies and shared budgets.
2. Measure pre-change headroom. For each, compare actual CPA or ROAS over the 30 to 90 days before 17 August with the target. The larger the gap, the larger the expected shift.
3. Compare clean windows. Use a period fully before 17 August against a period fully after rollout finished on 27 August. Segment by day or week so the transition is visible instead of averaged away.
4. Read change history. Filter Change History for bid strategy, target and budget edits from mid-August onwards. Every edit your team made is a second break in the data.
5. Allow for conversion lag. Google Ads reports conversions by click date. Recent days will fill in as late conversions arrive, so the last week always looks weaker than it will end up. Wait one to two conversion cycles before drawing conclusions.
6. Keep sources apart. Google Ads counts by click time and GA4 by event time. Do not mix them in one comparison. See why GA4 and Google Ads numbers differ.

How to respond

Once you know which campaigns are exposed, set each target from what a trial or demo request is worth to the business, and adjust budgets so the campaigns that deserve more volume can get it at the new targets. Record the date you make these changes.

Treat late August with care: it covers the rollout, any changes your team made in response, and a seasonally quiet month in much of Europe. Any window that crosses 17 August shows Google's change as well as market movement, and any window that crosses the date of your own changes shows those too.

Three rules follow from that:

• Do not compare windows that straddle the change. "Last 30 days against the previous 30 days" stays contaminated until both windows start after 27 August, which is not until late October.
• Annotate reports. Mark 17 August (Google's change), 27 August (rollout complete) and the date of your own target and budget changes on every chart and in monthly commentary.
• Suppress planned changes in alerts. If you run automated checks that compare a recent window with a longer baseline, flag your own target and budget changes as planned so they are not raised as incidents. Our article on what to automate in PPC explains how those checks work.

Across European markets

Targets are set in account currency, and cost per conversion is not comparable between markets because auction prices differ. Review targets market by market against each market's own history.

Checklist

If you would like a second view on your targets after this change, our paid search service starts with exactly this kind of review.